# US 10,480,505 B2 · Arrangement for specifying a pressure

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- Number: US 10,480,505 B2
- Document ID: US10480505B2
- Status: Granted
- Kind: B2
- Application number: 14/942,145
- Filed: 2015-11-16
- Published: 2017-03-30
- Granted: 2019-11-19
- Earliest claimed: 2015-09-30
- Assignees: ebm-papst St. Georgen GmbH & Co. KG
- Applicants: ebm-papst St. Georgen GmbH & Co. KG
- Inventors: Alexander Hahn; Marcus Hellmann; Michael Kisch; Jens Loeffler; Manfred Bitzer
- Web page: https://patentgrep.com/patent/US10480505B2

## CPC

- F04C 14/06: specially adapted for stopping, starting, idling or no-load operation
- F04B 17/03: driven by electric motors
- F04B 49/065: {and making use of computers}
- F04C 2/102: {the two members rotating simultaneously around their respective axes}
- F04C 2/126: {with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type}
- F04C 15/008: {Prime movers}
- F04C 18/10: of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member
- F04C 18/126: {with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type}
- F04C 28/06: specially adapted for stopping, starting, idling or no-load operation
- F04C 29/0085: {Prime movers}
- G01L 5/26: for determining the characteristic of torque in relation to revolutions per unit of time
- H02P 1/16: for starting dynamo-electric motors or dynamo-electric converters
- F04B 2201/0402: Lubricating oil temperature
- F04B 2203/0201: Current
- F04B 2203/0207: Torque
- F04B 2203/0209: Rotational speed
- F04B 2205/05: Pressure after the pump outlet
- F04C 2240/40: Electric motor
- F04C 2270/025: Controlled or regulated
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

An arrangement (100) for specifying the pressure (64), produced by a pump (30) driven by an electric motor (31), includes a processor (116) which derives a target pressure value (62, 118) from an internal torque value (114) and a loss torque (108). The arrangement (100) further derives (112) the internal torque value (114) from a motor current value (110) and a motor constant ke.

## Claims

### Claim 1

Apparatus (100) for specifying pressure (64) generated by a pump (30) driven by an electric motor (31), said apparatus comprising:
the electric motor (31) configured to drive the pump (30);
a source (46, 20, 16) of instantaneous fluid pressure values (64) and a pressure controller (12) coupled to an output of said source;
a first processor (112) configured to calculate an internal torque value (114) based on a motor current value (110) and a motor constant ke;
a second processor (116) configured to calculate a target pressure value (62) corresponding to a target pressure of the pump (30) based on a difference between said internal torque value (114) and a loss torque value (108); and
a third processor (109) configured to calculate said loss torque value (108) based on a temperature value (104) and a motor RPM value (106);
wherein a pressure difference is determined based on the difference between an instantaneous pressure of the pump and the target pressure value (62), and a motor control signal is generated that corresponds to the pressure difference to control the electric motor (31) to drive the pump (30) at the target pressure; and
wherein said pressure controller (12), based upon a difference between an instantaneous fluid pressure value (64) and a target pressure value (62), generates a setpoint value (118) which influences power supplied to said motor (31), to bring said instantaneous pressure value (64) toward said target pressure value (62).

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein said second processor (109) uses a performance characteristic matrix (102) in calculating said loss torque (108).

### Claim 3 (depends on 1)

The apparatus according to claim 1, wherein said pump is a displacement pump (30).

### Claim 4 (depends on 2)

The apparatus according to claim 2, wherein said pump is a displacement pump (30).

### Claim 5 (depends on 1)

The apparatus according to claim 1, wherein said pump is an internal gear pump (30).

### Claim 6 (depends on 2)

The apparatus according to claim 2, wherein said pump is an internal gear pump (30).

### Claim 7 (depends on 1)

The apparatus according to claim 1, wherein said pump is a gerotor pump (30).

### Claim 8 (depends on 2)

The apparatus according to claim 2, wherein said pump is a gerotor pump (30).

### Claim 9 (depends on 1)

The apparatus according to claim 1, wherein said pressure controller (12) is a proportional-integrating (PI) controller.

### Claim 10 (depends on 1)

The apparatus according to claim 1, wherein said third processor (109) uses a performance characteristic matrix (102) in calculating said loss torque value (108).

### Claim 11

A controller for operating a pump (30) which is driven by an electric motor (31), comprising
a speed-ramp (14) which directs motor start-up steps;
a pressure controller (12) coupled to an output of a source of instantaneous fluid pressure values (64) and which controls post-start-up operation of the motor, said pressure controller (12) configure to calculate a target pressure value (62) corresponding to a target pressure of the pump (30) based on a difference between an internal torque value (114) as a function of a motor current value (110) and a motor constant ke and a loss torque value (108) as a function of a temperature value (104) and a motor RPM value (106);
said pressure controller (12), based upon a difference between an instantaneous fluid pressure value (64) and a target pressure value (62), generating a setpoint value (118) which influences power supplied to said motor (31), to bring said instantaneous pressure value (64) toward said target pressure value (62); and
a changeover switch (80) which determines when control of said pump is passed from said speed ramp (14), handling a start-up mode, to said pressure controller (12), handling a continuous-operation mode.