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US 10,097,121 B2Granted
Method and device for controlling an electric motor
AssigneeRobert Bosch GmbH
InventorsChristoph Emde, Andreas Schmidtlein, Rainer Baumgaertner
Life of this patent
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Abstract
A method and a device for controlling an electric motor using pulse-width modulated control signals. Control pulses having a setpoint duty factor and temporally varying pulse widths and pulse spacing are generated in the process, the temporally varying pulse widths and pulse spacing being selected as a function of a load and/or thermal loading of the electric motor and/or its control device.
Claims33
A method for controlling an electric motor using pulse-width modulation, the method comprising:
- generating control pulses having a setpoint duty factor and temporally varying pulse widths and pulse spacing;
- varying the pulse widths and the pulse spacing so that a sound emission spectrum generated by the control of the electric motor using the control pulses is approximated to a spectrum of ambient noise;
- and
- controlling the electric motor using the control pulses, wherein the temporally varying pulse widths and pulse spacing are generated as a function of at least one of a load of the electric motor and a thermal loading of a control device of the electric motor;
- wherein a minimum period duration and a maximum period duration are specified as a function of at least one of the load of the electric motor and of the thermal loading of the control device,
- wherein an operating state is taken into account when selecting the pulse-width modulation frequency, and
- wherein the pulse widths and pulse spacing are varied based on a spectral behavior Spectotal determined from a totality of spectrums of the set pulse-width modulation frequencies Spec(fpwm(i)).
4 more elements
A device for controlling an electric motor using pulse-width modulation, comprising:
- a generating device to generate control pulses having a setpoint duty factor and temporally varying pulse widths and pulse spacing;
- and
- a control device to control the electric motor using the control pulses;
- wherein the temporally varying pulse widths and pulse spacing are varied so that a noise emission spectrum generated by the control of the electric motor using the control pulses is approximated to a spectrum of ambient noise,
- wherein the temporally varying pulse widths and pulse spacing are generated as a function of at least one of a load of the electric motor and a thermal loading of the control device of the electric motor,
- wherein a minimum period duration and a maximum period duration are specifiable by the generating device as a function of the at least one of the load of the electric motor and the thermal loading of the control device,
- wherein an operating state is taken into account when selecting the pulse-width modulation frequency, and
- wherein the pulse widths and pulse spacing are varied based on a spectral behavior Spectotal determined from a totality of spectrums of the set pulse-width modulation frequencies Spec(fpwm(i)).
5 more elements
Dependencies are inferred from the claim text.