voith hydraulic pump free sample

For hydraulic systems that place high demands on control engineering, servo pumps are the perfect solution. The basic version of these pump systems also consists of three main components:Servo inverter

Servo pumps control the pressure or the volume flow. They precisely convert electrical energy into the hydraulic energy that is currently needed in the system. The classic use of valves for control can be either completely or partially omitted. This considerably simplifies every hydraulic system.

Voith components record and transmit a wide range of operating parameters, including pressure, acceleration and temperature. Further information such as oil level, filter condition and plant efficiency can be collected for the purpose of condition monitoring. A software package is programmed to receive data from the servo inverter at regular intervals. This stored data then serves as a base, and deviations are immediately detected and predictive maintenance initiated. Through this process both the machine and system is optimized, saving valuable time and earnings. Furthermore, on-site service calls as a result are reduced by up to 70 percent.

The torque converter provides the most time-efficient startup and shutdown of a storage pump. It transmits torque and/or power from the motor generator to the pump shaft by being filled with process water.

The startup of the storage pump already begins during the filling process. As the pressure level of the filling water rises, the torque output by the converter increases and thus accelerates the pump. This acceleration torque, which is initially very high, continuously decreases as secondary speed rises. When reaching the synchronous speed, the converter output torque corresponds to the pump priming torque.

Progressive Power & Control sells internal gear pumps, high pressure gear pumps, low-viscosity fluid pumps, multiple flow pumps from Voith Turbo. Voith Turbo purchased H+L Hydraulik GmbH & Co. KG formerly known as Hartmann+Lämmle GmbH Co. KG, enhancing the Voith hydraulic component offerings with the VTHL (or VT H+L) hydraulics division to serve mobile hydraulics and industrial hydraulic customers.

Voith pumps are also used in many manufactured systems. Rather than pay the "upcharge" from the manufacturer, we can frequently provide you with the exact Voith replacement component you need for your equipment.

Voith internal gear pumps allow you to save space in your machine. The high rates of efficiency, thanks to gap compensation, allow efficient operation, and the optimized pressure progressions ensure low pump flow and pressure pulsations in your hydraulic system. This, combined with a compact force guide inside the Voith internal gear pump, reduces noise emissions so you can more easily meet the ever tightening workplace regulations on sound output.

Both the high-pressure and medium-pressure Voith IP pumps share similar design features, including radial compensation, axial compensation, internal gearing and plain bearings which ensure a smooth flow with minimal pulsation. IP pumps can be combined to create systems with multiple flows.

Internal gear rotation draws hydraulic oil or other pressure fluid into the area between the pinion gear and the internal gear. Radially, the gear chambers are closed by the gear teeth meshing. Pressure fluid is displaced when the tooth heads enter the gaps between gear teeth. The axial plates seal the pressure chamber with the minimal possible gap, reducing volume loss and increasing efficiency.

Voith IP pumps of the same or different sizes can be combined to form multiple-flow pumps. All sizes of Voith multi-flow pumps are available as two or three-flow pumps, and as four-flow pumps by custom order.

Directional control fast pilot valves make switching times possible, over 50% faster than direct-controlled valves. Switching time adjustment, stroke limiter and monitoring are available as options. Voith Turbo Hydraulics offers special equipment with standard directional control valves. Due to the compact building design with standing magnet (double solenoid coil with 4/3 valves) the valves can be integrated even in the smallest fitting spaces.

Voith Turbo hydraulic flow control valves are pressure compensated in the millisecond range, and changes in viscosity do not influence the flow rate.

Direct-controlled Voith Turbo pressure control valves are constructed in seat or piston design. The pressure control valve cartridges can be built directly into control blocks. Voith accumulator charging valves with constant switching limit and soft switching are particularly suitable for drive systems. Use memory load valves to design the installed drive power for the average need. All pressure control valves can be equipped with a gauge connecting valve.

The combination of structure and intermediate plate devices permits the realization of control units with many functions in a small space. The control paths and thus the oil columns are kept very short, a necessary condition for good dynamic behavior of the hydraulic control.

Pressure relief valves, type DBV, are capable of controlling and limiting the operating pressure and the flow rate in a hydraulic system. Independent of the set maximum operating pressure, the valve can switch to pressure-free circulation hydraulically, electromagnetically or via an external control oil connection.

The pressure relief valves DBV 50/60 switch the flow on and off depending on the pressure (hysteresis normally set to 10% of system pressure). To allow direct attachment to hydraulic pumps, and especially Voith IP pumps, the pressure relief valves are available with SAE flange connections in 4 sizes (10, 16, 25, 32 mm). The installation orientation can be freely selected.

VTHL electro-hydraulic amplifiers are numerically controlled precision drives. They consist of the set value input assembly, follow-up control valve and the actuator, which can be either a cylinder or a hydraulic motor. Actuator and follow-up control valve are linked by mechanical feedback. Electric low-power set value input combined with a hydraulic actuator result in high power density, low energy consumption, and high closed-loop gain. The electronic controls are coordinated with the special requirements of electro-hydraulic amplifiers. Interface modules make interfacing possible to all kinds of machine controls.

Voith Turbo has succeeded in integrating the well-established internal gear pumps, type IPM (medium pressure, up to 175 bar) and type IPV (high pressure, up to 330 bar) in an asynchronous electric motor. With that an electro-hydraulic unit is available which is very compact in design while also ensuring remarkable low noise emissions. Variable flow from fixed displacement pumps, electric motor - pump - aggregate (with frequency inverter)

The EPA/EPAF Voith internal gear pump or pump combinations generate pressure and volume flow. Asynchronous motor to drive the pump. Frequency inverter for controlling the speed of the motor. EPA/EPAF units can be created with all Voith internal gear pumps

The EPAF variable-speed motor pump unit with the internal gear pump which was specially developed for the delivery of low-viscosity media. Due to its renowned high efficiency, the IPME pump type is particularly suited as a delivery pump for the cooling lubricant circuit in machines with internally cooled tools. A pressure-dependent drive speed control allows cooling lubricant to be delivered as and when it is required. Pressures up to 100 bar can be generated.

VTHL hydraulic units guarantee your pressure supply. With Voith"s accumulator charging technique you generate exactly as much hydraulic energy as demanded by the process. The momentary available volume flow, dependent on the selected accumulator size, will be a multiple of the actually installed pump volume capacity.

Voith components record and transmit a wide range of operating parameters, including pressure, acceleration and temperature. Further information such as oil level, filter condition and plant efficiency can be collected for the purpose of condition monitoring. A software package is programmed to receive data from the servo inverter at regular intervals. This stored data then serves as a base, and deviations are immediately detected and predictive maintenance initiated. Through this process both the machine and system is optimized, saving valuable time and earnings. Furthermore, on-site service calls as a result are reduced by up to 70 percent.

The torque converter provides the most time-efficient startup and shutdown of a storage pump. It transmits torque and/or power from the motor generator to the pump shaft by being filled with process water.

The startup of the storage pump already begins during the filling process. As the pressure level of the filling water rises, the torque output by the converter increases and thus accelerates the pump. This acceleration torque, which is initially very high, continuously decreases as secondary speed rises. When reaching the synchronous speed, the converter output torque corresponds to the pump priming torque.

If you are looking for a different type of water pumps, such as a bors hoe water pumps, is an excellent choice for both large and high-pressure water pumps. As the name implies, it is a by-product of the two types of electricith pumps, which are both great and long-lasting. The pump is usually a hydraulic piston pump, with one or two piston hydraulic pumps.

They are usually made of a hydraulic piston. And the other type is the hydraulic piston pump. Xy water pumps are great for high-pressure applications, such as piston pumps, which are in a form of hydraulic piston pumps.

Voith internal gear pumps setting standards 3 Applications 4

1. Single pumps 5 1.1 Procedure for selection of single pumps 5 1.2 Oder description and model code 67 Type IPH 6 Type IPV 6 Type IPC 7 Type IPN 7

2. Multiple-flow pumps 8 2.1 Procedure for determing multiple-flow pumps 8 2.2 Determining pump sequence for multiple-flow pump combinations 9 10 2.3 Order description of multiple-flow pumps 11 2.4 Possible pump combinations of two or more pumps 12 13 2.5 Torque control 14 15 2.6 Determining the intermediate housing 16 17 2.7 Dimensions of the intermediate housing for multiple-flow pumps 18 19 2.7.1 SAE mounting flange 20 2.8 SAE suction and pressure flanges 21 2.9 Dimension chains for pump combinations, calculation of total length 22 2.9.1 Length of Voith IP pumps 23

3. Combining Voith IP pumps with pumps from other manufacturers 24 3.1 Mounting pumps from other manufacturers on to Voith IP pumps 24 3.1.1 Intermediate housing with coupling 25 3.2 Mounting Voith IP pumps on to pumps from other manufacturers 26 3.2.1 Order description for Voith IP pumps on to pumps from other manufacturers 27

The market requires hydraulic pumps to be compact and requires a further reduction of noise level and pressure pulsation at high efficiency.

Voith internal gear pumps have a large range of applications where low operation noise, high efficiency, compact dimen- sions and light weight are required.

3 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en Applications

Data sheets Leaflet G 1418 for IPN 4 to IPN 6 Low pressure internal gear pump type IPN with the Voith Superlip System

5 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 1.2 Order description and model code

Direction of rotation and Direction of rotation and suction suction 1 Clockwise rotation, 1 Clockwise rotation, radial suction mounting radial suction mounting 6 Anti-clockwise rotation, 6 Anti-clockwise rotation, radial suction mounting radial suction mounting 4 Special design pumps, 4 Special design pumps, clockwise rotation clockwise rotation 9 Special design pumps, 9 Special design pumps, anti-clockwise rotation anti-clockwise rotation

Internal gear pumpe type Internal gear pumpe type IPH IPV

6 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en Type IPC Type IPN

Direction of rotation and Direction of rotation and suction suction 1 Clockwise rotation, 1 Clockwise rotation, radial suction mounting radial suction mounting 6 Anti-clockwise rotation, 6 Anti-clockwise rotation, radial suction mounting radial suction mounting 4 Special design pumps, 4 Special design pumps, clockwise rotation clockwise rotation 9 Special design pumps, 9 Special design pumps, anti-clockwise rotation anti-clockwise rotation

Internal gear pumpe type Internal gear pumpe type IPC IPN

7 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 2. Multiple-ow pumps 2.1 Procedure for determining multiple-ow pumps

1 Fill in the selected pump stages on the 1 Selection of the pump stages order details form; Assistance can be Establishing the pump sequence taken from the single pump catalogues and practicability Page 6-7, 12-13

2 Check the torque with the assistance of 2 the selecting criteria point 2.5 Checking the torque for reliability Page 14-15 3 Select the intermediate housing, see selecting criteria point 2.6 3 Establishing the intermediate housing 4 Fill in the direction of rotation and suction and the resulting suction Page 16-19 points and order code 4 5 Selection of the fastening flange with Determining the direction of rotation order code (see single pump catalogue) Page 6-7,10

6 Selection of the end of the drive shaft 5 Determining the fastening flange 7 Points 1-6 form the complete order corresponding to primary pump Page 6-7,10 description 6 10/11 Connecting dimensions of two and three Determining the end of the drive shaft pump combinations see point 2.9 page 22 corresponding to the primary pump Page 6-7,10

8/9 Selection of the suction or pressure 7 flanges see single pump and/or Order description for the multiple-flow intermediate housing pump combination Page 11-13

IP pumps of the same or of different sizes can be As a rule the multiple-flow pumps are fastened to combined to multiple-flow pumps. the drive by means of fastening flanges. It is All sizes listed as single pumps with the respec- possible to select between different fastening tive capacities are available as two and three flanges, see individual catalogues. The same pump combinations ordered in ascending order applies to the shaft ends. The intermediate according to size and flow-rate. housings required can be found on pages 16 -19.

It is important to observe the sequence of pumps In addition to pump combinations of two or three shown above according to model and size. It is pumps it is possible to combine four pumps, but possible to skip over sizes. this requires agreement from the manufacturers.

With the same models (V,C.N) and the same sizes (3,4,5,6,7) the pump with the bigger flow- Suction connections for multiple-flow rate is placed next to the drive. pumps

Possible pump combination can be find out on With combinations of IPV and/or IPC pumps it is table on page 12-13. partly possible to select between suction connec- tion at the intermediate housing and/or at the pump stages.

9 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en Designs

See individual pump sheets for designs See individual pump 1 6 and dimensions sheets for dimensions

Two pump combination Example of order description Three pump combination Example of order description

IPV/N - 200/80 111 IPV/N/V - 200/80/10 111 Pump 1: IPV 7-200 11 Pump 1 IPV 7-200 11 Pump 2: IPN /5-/80 Pump 2: IPN /5-/80 Pump 3: IPV /3-/10

Direction of rotation and Direction of rotation and suction suction 1 one suction connection 1 one suction connection per pump stage per pump stage Is determined according to Is determined according to required intermediate housing. required intermediate housing. Clockwise rotation Clockwise rotation

Flow rate of the individual pump Flow rate of the individual pump stages see point 2.2 to 2.5 of the stages see point 2.2 to 2.5 of the individual pumps. individual pumps. 200 80 200 80 10

Size of the individual pump stages. Size of the individual pump stages. 7 5 7 5 3

Two internal gear pump combination Two internal gear pump combination consisting of consisting of Type IPV, IPN Typ IPV, IPN

Exception: Exception:If all pump stages are the same pump model use the model in the order If all pump stages are the same pump model use the model in the orderdescription only once. description only once.Example: IPV 5/3-50/10 111 Example: IPV 5/4/3-64/25/8 211 Pump 1: IPV 5-50 111 Pump 1: IPV 5-64 211 Pump 2: IPV /3-/10 Pump 2: IPV /4-/25 Pump 3: IPV /3-/8

11 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 2.4 Possible pump combinations of two or more pumps

Possible pump combinations Pump sequence in any order (as chosen) with the same model size sequence of the flow rates in any order (as chosen).

Capacity [cm3/U] 3,5-5-6,3-8-10 13-16-20-25-32 32-40-50-64 64-80-100-125 125-160-200-250 20-25-32 40-50-64 Pump 1

12 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en Pump 1 Pump 2 Pump 1 Pump 2

dark blue: primary pump at double pumps light blue: first secondary pump at double pumps first secondary pump at triple pumps second secondary pump at triple pumps

13 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 2.5 Torque control

With pump combinations of three or more pumps the torque occurring between the pump stages can reach high values that are not permissible and, if left unheeded, will lead to damage to the pumps! The sum of the torques of the single pump stages may not exceed the permissible values!

IPV 3 160 80If necessary please contact Voith. IPV4 335 190

15 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 2.6 Determining the intermediate housing

Capacity [cm3/U] 3,5-5-6,3-8-10 13-16-20-25-32 32-40-50-64 64-80-100-125 125-160-200-250 20-25-32 40-50-64 Pump 1

16 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en Suction via pump stages Suction via intermediate housing

17 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 2.7 Dimensions of intermediate housing for multiple-ow pumps

110 110 55 100 76 106.3 62 M 16x25 deep 17 m/2 115 140 70 120 100 130.2 77.8 M 16x25 deep 18 c m c k 116 90 45 82 60 89 50.8 M 12x20 deep 16 118 110 55 100 76 106.3 62 M 16x25 deep 17 Intermediate housing with joint suction from 2 121 140 70 120 100 130.2 77.8 M 16x25 deep 18 pump stages, the same size. 131 70 35 74.3 40 70 36 M 12x20 deep 14 Selection of the intermediate housing 133 90 45 90 60 89 50.8 M 12x20 deep 16 see point 2.6. 136 110 55 110 76 106.3 62 M 16x25 deep 17

107 90 45 90 60 89 50.8 M 12x20 deep 16 m/2 108 110 55 110 76 106.3 62 M 16x25 deep 17 c m c k 109 110 55 110 76 106.3 62 M 16x25 deep 17 111 110 55 110 76 106.3 62 M 16x25 deep 17 Intermediate housing with joint suction from 2 112 110 55 110 76 106.3 62 M 16x25 deep 17 pump stages of different sizes. 113 110 55 110 76 106.3 62 M 16x25 deep 17 114 140 70 120 100 130.2 77.8 M 16x25 deep 18 117 110 55 100 76 106.3 62 M 16x25 deep 17 119 110 55 110 76 106.3 62 M 16x25 deep 17 120 110 55 100 76 106.3 62 M 16x25 deep 17 122 66 33 74.3 40 70 36 M 12x20 deep 30 123 70 35 74.3 40 70 36 M 12x20 deep 30 124 80 40 90 50 77.8 42.9 M 12x20 deep 15 125 90 45 90 60 89 50.8 M 12x20 deep 16 126 90 45 110 60 89 50.8 M 12x20 deep 16 127 110 55 110 76 106.3 62 M 16x25 deep 17 128 90 45 90 60 89 50.8 M 12x20 deep 16 129 110 45 110 76 106.3 62 M 16x25 deep 17 130 110 55 110 76 106.3 62 M 16x25 deep 17 132 90 45 90 60 89 50.8 M 12x20 deep 16 134 110 55 110 76 106.3 62 M 16x25 deep 17 135 110 55 110 76 106.3 62 M 16x25 deep 17

18 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en No. o No. o 201 46 202 50 203 60 204 58 206 64 205 64 208 52 207 64 210 64 209 60 c o c 213 72 c o c 211 60 225 48 212 70Intermediate housing with separate suction Intermediate housing with separate suction 227 62 214 60from 2 pump stages, the same size. from 2 pump stages, different sizes. 230 67 215 70 231 55 216 72 232 56 217 60 233 55 218 64 234 56 219 60 235 48 220 70 236 55 221 72 237 56 222 60 223 70 224 72 226 54 228 63 229 66

19 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 2.7.1 SAE mounting ange

21 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 2.9 Dimension chains for pump combinations calculation of total length

23 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 3 Combining Voith IP pumps with pumps from other manufacturers 3.1 Mounting pumps from other manufacturers on to Voith IP pumps Type Intermedi- O A B C D O-Ring E L T Pitch ate housing

Dimensions for Voith internal gear pumps IPV 4 to 7, IPH 5 IPV 6 105 92 101,6G7 10 1460,3 M 12 102x3 17 41 13 16/32IPC 4 to 7 and IPH 4 to 6 can be taken from the dimension IPC 6sheet for the individual pump, dimensions for pumps of IPH 6other designs can be taken from the respective manufac- IPV 7 106 92 101,6G7 10 1460,3 M 12 102x3 17 41 13 16/32turers catalogue. IPC 7

IPV 5 107 80 101,6G7 10 1460,3 M 12 102x3 17,5 46 15 16/32The choice of possibilities for mounting flange and shaft IPC 5end correspond to the data on the single pump sheets. IPH 5 IPV 6 108 92 101,6G7 10 1460,3 M 12 102x3 17,5 46 15 16/32Combinations of Voith internal gear pumps model IPN with IPC 6

pumps from other manufacturers on request. IPH 6 IPV 7 109 92 101,6G7 10 1460,3 M 12 102x3 17,5 46 15 16/32 IPC 7

clockwise anti-clockwise 1 6 0 1 1 IPC 4 100 1 6 0 1 1 IPH 4 IPV 5 101 1 6 0 1 1 IPC 5 IPH 5 IPV 6 102 1 6 0 1 1 IPC 6 IPH 6 IPV 7 103 1 6 0 1 1 IPC 7 IPH 4Combinations consisting of Voith internal IPV 5 104 1 6 0 1 1gear pumps model IPV, IPC or IPH and inter- IPC 5mediate housing with coupling, suitable for IPH 5mounting of pumps with mounting flange to IPV 6 105 1 6 0 1 1 IPC 6DIN ISO 3019-1 and drive shaft with involute IPH 6splining to ANSI B 92.1a. IPV 7 106 1 6 0 1 1 IPC 7 IPV 5 IPC 5 107 1 6 0 1 1 IPH 5 IPV 6 108 1 6 0 1 1 IPC 6 IPH 6 IPV 7 109 1 6 0 1 1 IPC 7 IPH 5 IPV 6 110 1 6 0 1 1 IPC 6 IPH 6 IPV 7 111 1 6 0 1 1 IPC 7Ordering example IPV 6 IPC 6 112 1 6 0 1 1IPV 5-50 with intermediate housing 104rotating clockwise with SAE-2-hole flange IPH 6 IPV 7 113 1 6 0 1 1and cylindrical drive shaft with feather key. IPC 7 IPV 7 IPV 5/104-50/... 101 114 1 6 0 1 1 IPC 7

25 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en 3.2 Mounting Voith IP pumps on to pumps from other manufacturers

Mounting Voith internal gear pumps on to Dimensions table 2 (length of intermediate flange) and description of intermediate flange RKP RKP RKP RKP RKP RKP Wepuko radial piston pumps 16/19 32/45 63/80/ 140 110/125/ 250 90/100 160/180 Moog adjustable piston pumps, only with heavy Type p Des. p Des. p Des. p Des. p Des. p Des. through-drive IPV 3 50 500 50 501 50 502 50 503 17 17 Combinations of IPN with radial piston pumps on IPC 4/IPV 4 55 504 55 505 55 506 17 17 request. IPC 5/IPV 5 55 507 55 508 55 509 40 17 IPC 6/IPV 6 55 510 55 511 66.5 72.5 IPC 7/IPV 7 56 512 66.5 72.5 Please refer to the data sheet for the single pumps for IP dimensions.

RKP 110 to 250 RKP 16 to 140 Ordering example Supplier RKP Wepuko Moog for mounting pump, intermediate housing Supplier of mounting parts Wepuko Voith and drive shaft. Supplier of IP pump Voith Voith IPV /5 508-/40 129 Dimensions of the RKP pumps L1, L2, L6 are to be requested from the respective manufacturers. IPV /5/5 508-/50/40 229

26 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en3.2.1 Order description for Voith IP pumps on to pumps from other manufacturers

2 Direction of rotation clockwise, joint suction for IPV 5/5. 2 Description of pump with mounting flange for Moog RKP. 9 Description of shaft extension for mounting on Moog RKP with heavy through-drive.

27 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 en Order details Original form for copying

Pump 1 Continuous pressure in system bar Maximum pressure in system bar Capacity/rev. Pump 2 Continuous pressure in system bar Maximum pressure in system bar Capacity/rev. Pump 3 Continuous pressure in system bar Maximum pressure in system bar Capacity/rev.

Internal gear pumps Sizes Capacity Direction Fasten- Shaft of rotation ing end Suction ange

Pre-selection Primary pump IP st Pump 1 B pump IP / / / nd sequence 2 B pump IP / / /

Two pump IP / / / combination Final sequence of the pump stages Three pump IP / / / / / / combination

29 Voith Turbo | Voith Multiple-Flow Pumps Programme | G 1714 enVoith Turbo H + L Hydraulic GmbH & Co. KGSchuckertstr. 1571277 Rutesheim, GermanyTel. +49 7152 992-3Fax +49 7152 992-400sales-rut@voith.comwww.voithturbo.com/hydraulic-systems

Model tests for two individual Pelton turbines and a storage pump have been successfully completed for the Ritom pumped storage plant in Switzerland, confirming guaranteed values and expectations.

At its research and development center, the Brunnenmühle in Heidenheim, Voith technology group successfully completed three fully homologous model acceptance tests on a 5- and 6-nozzle Pelton turbine and a storage pump.

The Voith experts determined the efficiency, maximal output, runaway speed and the hydraulic forces of the machines on the basis of the fully homologous models. The specialists also controlled the cavitation behaviour at different operating points. As a result, the subsequent behaviour of the machines were analysed and the guaranteed parameters verified. The contractually assured guarantees were confirmed by the measurements and in some cases exceeded.

Even before the model acceptance tests were carried out, the electromechanical parts of the new machines were examined with detailed simulation models and optimized with regard to all requirements, said Voith, with its team initially starting testing on the two-stage storage pump.

"The results of the model acceptance tests for the storage pump were very positive. We were able to achieve parameters that exceeded the contractually guaranteed performance," said Christian Matten, Project Manager at Voith Hydro.

Afterwards the model acceptance tests of the two Pelton turbines were carried out. Despite the high efficiency guarantees, the parallel development of two completely different Pelton turbines and numerous conversions on the test stand, the Voith team was able to achieve the guaranteed parameters and thus successfully complete the model acceptance tests.

"Currently, the engineering of all components of the hydraulic and electric machines is in progress. The components from earlier construction phases, for example, the turbine housing and the distribution piping, are already in production. If everything goes according to schedule, these components can be installed on site in May 2021," explained Matten.

The four Pelton turbines with a total rated output of 44MW used in the existing Ritom storage power plan will be replaced by significantly more powerful machine groups in the new power plant. Voith will supply two Pelton turbines, each up to 60MW capacity and with a 60MW storage pump.

The first machine unit will supply power for the 16.7-Hz-grid of the Swiss Federal Railways and for operating its trains. The second machine unit will feed electricity into the public 50-Hz-grid. In conjunction with the turbine, the storage pump can provide control power for rapid grid regulation and stabilization with maximum flexibility.

The new hydropower plant will provide a control band from 60MW of feed-in to 60MW of power consumption for the Swiss 50-Hz-grid. In addition, the storage pump can be accelerated and synchronized with the grid using the 50-Hz-Pelton group by means of back-to-back startup.

The invention is based on the task of improving still further a motor/pump unit of the mentioned design, in particular with respect to the production cost and the space requirement.

This task is accomplished through a motor-pump unit including an electric motor and a pump that is concentrically surrounded by a rotor of the motor, the rotor of the electric motor being U-shaped, a cross-piece of the U-shaped rotor being provided with an interior toothing, and a shaft of the pump including a pinion that meshes with the interior toothing of the cross-piece.

Accordingly, the rotor of the electric motor, viewed in an axial section, is U-shaped. Here, the cross-piece of the “U” is provided, in the region of the axis of the unit, with an interior toothing, and the drive shaft of the pump with a corresponding pinion, so that the interior toothing and the pinion mesh with each other.

The pump forms in this case a completely independent, self-sufficient unit. It can be produced separately, tested separately, and be installed completely into the space enclosed by the stator of the electric motor.

It comprises further an inner gear pump 2. This displays a pinion 2.1, an eccentric hollow wheel 2.2 opposite this, as well as a pinion shaft 2.3. The pinion shaft 2.3 is seated in lateral discs 2.4, 2.5. In the present case, provision is made for slide bearings 2.4.1, 2.5.1.

The two elements motor and pump are enclosed by a common housing 3. Located in the housing is an intake 3.1 as well as an outlet 3.2 for the medium to be pumped.