Energizing and measuring the temperature of stator windings in an at least motor-driven electric polyphase machine

Patent metadata

Field	Value
Publication number	US-2016334281-A1
Application number	US-201415110201-A
Country	US
Kind code	A1
Filing date	Dec 11, 2014
Priority date	Jan 10, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

A method for energizing the stator windings of a rotating field machine operable in motor mode, the stator windings respectively being impinged upon with phase currents that are predefined using a vector-based method. The phase currents are impinged upon at least in part with bias currents that are determined by the vector-based method in such a way that they exhibit no torque effectiveness in the rotating field machine.

First claim

1 - 6 . (canceled)

7 . A method for determining a temperature of stator windings of a rotating field machine operable in motor mode, in which for energizing the stator windings at least four degrees of freedom exist, the method comprising:
ascertaining an ohmic resistance of the stator windings by applying phase currents to the stator windings, the phase currents being predefined using a vector-based method; wherein at least during the ascertainment of the ohmic resistance, the phase currents are predefined by the vector-based method in such a way that the phase currents oscillate with a phase-current amplitude and a phase-current frequency around average values, the phase-current amplitude and the phase-current frequency being determined based on at least one of a requested rotational speed and a requested torque, of the rotating field machine, and the average values corresponding to bias currents, by which the phase currents are at least in part increased or reduced, and which are determined by the vector-based method, and which are determined in such a way that the phase currents exhibit no torque effectiveness in the rotating field machine.

8 . The method as recited in claim 7 , wherein the bias currents are predefined based on a transformation specification with which second current vectors, which are independent of torque-effective first current vectors, are converted into current values.

9 . The method as recited in claim 7 , wherein the method is used to energize a rotating field machine, the rotating field machine being one of a synchronous or asynchronous machine.

10 . The method as recited in claim 7 , wherein before the ohmic resistance of the stator windings is ascertained, the stator windings are energized for a predefined time by applying the predefined phase currents to the stator windings so that the stator windings heat up.

11 . A control device of a rotating field machine operable in motor mode, the control device configured to:
ascertain an ohmic resistance of the stator windings by applying phase currents to the stator windings, the phase currents being predefined using a vector-based method, wherein at least during the ascertainment of the ohmic resistance, the phase currents are predefined by the vector-based method in such a way that the phase currents oscillate with a phase-current amplitude and a phase-current frequency around average values, the phase-current amplitude and the phase-current frequency being determined based on at least one of a requested rotational speed and a requested torque, of the rotating field machine and the average values corresponding to bias currents, by which the phase currents are at least in part increased or reduced, and which are determined by the vector-based method, and which are determined in such a way that the phase currents exhibit no torque effectiveness in the rotating field machine.

12 . A machine-readable storage medium having a computer program for determining a temperature of stator windings of a rotating field machine operable in motor mode, in which for energizing the stator windings at least four degrees of freedom exist, the computer program, when executed by a processor, causing the processor to perform:
ascertaining an ohmic resistance of the stator windings by applying phase currents to the stator windings, the phase currents being predefined using a vector-based method; wherein at least during the ascertainment of the ohmic resistance, the phase currents are predefined by the vector-based method in such a way that the phase currents oscillate with a phase-current amplitude and a phase-current frequency around average values, the phase-current amplitude and the phase-current frequency being determined based on at least one of a requested rotational speed and a requested torque, of the rotating field machine and the average values corresponding to bias currents, by which the phase currents are at least in part increased or reduced, and which are determined by the vector-based method, and which are determined in such a way that the phase currents exhibit no torque effectiveness in the rotating field machine.

Assignees

• Bosch Gmbh Robert

Inventors

• Hoellmann Manuel

Classifications

• G01K2217/00

  Temperature measurement using electric or magnetic components already present in the system to be measured · CPC title

• H02P21/14

  Estimation or adaptation of machine parameters, e.g. flux, current or voltage · CPC title

• G01K7/16 Primary

  using resistive elements · CPC title

• H02P29/64

  Controlling or determining the temperature of the winding · CPC title