Method and device for regulating separately excited synchronous machines

• US 9,048,773 B2
• Filed: 07/01/2011
• Issued: 06/02/2015
• Est. Priority Date: 07/28/2010
• Status: Active Grant

• Current Assignee: Vitesco Technologies GmbH (Continental AG)
• Original Assignee: Continental Automotive GmbH (Continental AG)
• Inventors: Jaszczak, Krzysztof, Mrgner, Moritz, Mill, Oliver
• Primary Examiner(s): Ro, Bentsu
• Assistant Examiner(s): DINH, THAI T
• Application Number:
  US13/811,844
• Publication Number:
  US 20130207589A1
• Time in Patent Office: 1,432 Days
• Field of Search: 318/400.02, 318/400.03, 318/400.06, 318/400.15, 318/717, 318/434
• US Class Current: 1/1
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 50/10 using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
• CPC Class Codes: H02P 23/0077 Characterised by the use of a particular software algorithm
• CPC Class Codes: H02P 29/00 Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors arrangements for starting electric motors H02P1/00; arrangements for stopping or slowing electric motors H02P3/00; control of motors that can be connected to two or more different electric power supplies H02P4/00; regulating or controlling the speed or torque of two or more electric motors H02P5/00; vector control H02P21/00
• CPC Class Codes: H02P 29/02 Providing protection against overload without automatic interruption of supply protection against faults of stepper motors H02P8/36
• CPC Class Codes: H02P 29/032 Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
• CPC Class Codes: H02P 29/60 Controlling or determining the temperature of the motor or of the drive H02P29/02 takes precedence
• CPC Class Codes: H02P 29/64 Controlling or determining the temperature of the winding
• CPC Class Codes: H02P 29/66 Controlling or determining the temperature of the rotor
• CPC Class Codes: H02P 6/08 Arrangements for controlling the speed or torque of a single motor H02P6/10, H02P6/28 take precedence
• CPC Class Codes: H02P 9/14 by variation of field H02P9/08, H02P9/10 take precedence
• CPC Class Codes: H02P 9/30 using semiconductor devices
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Abstract

A regulating method and device for loss-optimized operation of a separately excited synchronous machine having a stator and a rotor are provided. The method may include: providing reference values for stator and rotor currents, wherein the reference value for the stator current and/or the reference value for the rotor current or an auxiliary parameter representing the reference value of the stator current and/or an auxiliary parameter representing the reference value of the rotor current is dependent on a predefined reference torque; providing maximum values for stator and rotor currents; comparing reference values for the stator and/or rotor currents or an auxiliary parameter representing the reference value of the stator current and/or an auxiliary parameter representing a reference value of the rotor current to the corresponding maximum values and reducing of the reference torque by a torque value if at least one reference value reaches or exceeds the corresponding maximum value.

Claims

1. A regulation method for a separately excited synchronous machine having a stator and a rotor, the regulation method comprising:

providing reference values for stator and rotor currents, wherein at least one of the reference value for the stator current, the reference value for the rotor current, an auxiliary variable representing the reference value for the stator current, and an auxiliary variable representing the reference value for the rotor current is dependent on a predetermined reference torque,

providing maximum values for stator and rotator currents,

comparing at least one of the reference values with a corresponding one of the maximum values, and

reducing the reference torque by a torque value in response to the at least one reference values reaching or exceeding the corresponding maximum value.

2. The regulation method of claim 1, wherein the reference values are stored in a lookup table, and wherein the reference values each correspond to a minimum-losses operating point, represented by corresponding operational parameters.

3. The regulation method of claim 1, wherein maximum values for stator and rotor currents are dependent on temperatures of specific components of the synchronous machine, on a rotation speed, and on an intermediate circuit voltage.

4. The regulation method of claim 3, wherein the maximum values for stator and rotor currents are dependent on temperatures of at at least one of the following types of specific components of the synchronous machine:

a stator winding, a rotor winding, a stator laminate stack, a rotor laminate stack, and a rotor bearing.

5. The regulation method of claim 4, wherein the rotation speed is also taken into consideration.

6. The regulation method of claim 1, in which wherein a torque value, reduced by the reference torque, is dependent on at least one of (a) the difference between the reference value for the rotor current and the maximum value for the rotor current and (b) the difference between the reference value for the stator current and the maximum value for the stator current.

7. The regulation method of claim 1, comprising scaling a difference between the reference value for the stator current and the maximum value for the stator current prior to the reduction in the reference torque.

8. The regulation method of claim 1, comprising:

comparing a plurality of temperatures for the synchronous machine with a plurality of maximum temperatures, and

varying at least one of the stator current and the rotor current in response to at least one of the plurality of maximum temperatures being reached or exceeded such that at least one of the plurality of maximum temperatures is subsequently undershot.

9. The regulation method of claim 1, further comprising a predictive torque regulation process, in which the rotor current is increased or reduced predictively based on at least one of (a) an expected load on the shaft and (b) expected regulation dynamics.

10. The regulation method of claim 1, wherein at least one of the auxiliary variable representing the reference value for the stator current and the auxiliary variable representing the reference value for the rotor current is formed from a ratio between the rotor current and a q component of the stator current.

11. A regulation device configured to regulate a separately excited synchronous machine with a stator and a rotor with low losses, the regulation device comprising:

a memory unit configured to provide;

reference values for stator and rotor currents, wherein at least one of the reference value for the stator current, the reference value for the rotor current, an auxiliary variable representing the reference value for the stator current, and an auxiliary variable representing the reference value for the rotor current is dependent on a predetermined reference torque, and

maximum values for stator and rotor currents, and

a processing unit configured to;

compare at least one of the reference values with a corresponding maximum value,

reduce the predetermined reference torque in response to the at least one reference value reaching or exceeding the corresponding maximum value.