Motor control device and motor control method

Patent metadata

Field	Value
Publication number	US-2016226409-A1
Application number	US-201314917824-A
Country	US
Kind code	A1
Filing date	Oct 23, 2013
Priority date	Oct 23, 2013
Publication date	Aug 4, 2016
Grant date	—

Abstract

A second upper-lower limit clipping unit performs an upper-lower limit clipping with an upper limit torque greater than that of a first upper-lower limit clipping unit, with respect to a value obtained by executing torque ripple correction by subtracting a torque ripple correction amount calculated by a torque ripple correction amount calculation unit, from a torque command subjected to the upper-lower limit clipping by the first upper-lower limit clipping unit. A carrier frequency correction amount calculation unit calculates a carrier frequency correction amount for correcting a carrier frequency of a power converter for driving the motor, in order to reduce losses in the power converter which have been increased by the execution of the torque ripple correction.

First claim

1 - 5 . (canceled)

6 . A motor control device for a vehicle which is provided with a motor as a power source, the motor control device comprising:
a first upper-lower limit clipping unit that performs upper-lower limit clipping with respect to a torque command received from a vehicle controller controlling a torque generated by the motor; a torque ripple correction amount calculation unit that calculates, on the basis of the torque command and a motor revolution speed of the motor, a torque ripple correction amount for suppressing torque ripples generated in the motor; a second upper-lower limit clipping unit that performs upper-lower limit clipping with an upper limit torque greater than that of the first upper-lower limit clipping unit, with respect to a value obtained by executing torque ripple correction by subtracting the torque ripple correction amount from the torque command subjected to the upper-lower limit clipping by the first upper-lower limit clipping unit; and a carrier frequency correction amount calculation unit that calculates a carrier frequency correction amount for correcting a carrier frequency of a power converter for driving the motor, in order to reduce losses in the power converter which have been increased by the execution of the torque ripple correction.

7 . The motor control device according to claim 6 , wherein
the carrier frequency correction amount calculation unit clips the carrier frequency correction amount with the upper limit value and reduces an amplitude of the torque ripple correction amount when the carrier frequency correction amount is greater than a predetermined upper limit value.

8 . The motor control device according to claim 6 , wherein
the torque ripple correction amount calculation unit stops the calculation of the torque ripple correction amount when the motor revolution speed becomes a predetermined revolution speed.

9 . The motor control device according to claim 7 , wherein
the torque ripple correction amount calculation unit stops the calculation of the torque ripple correction amount when the motor revolution speed becomes a predetermined revolution speed.

10 . The motor control device according to claim 6 , wherein
the carrier frequency correction amount calculation unit stops the calculation of the carrier frequency correction amount when the motor revolution speed becomes a predetermined revolution speed.

11 . The motor control device according to claim 7 , wherein
the carrier frequency correction amount calculation unit stops the calculation of the carrier frequency correction amount when the motor revolution speed becomes a predetermined revolution speed.

12 . The motor control device according to claim 8 , wherein
the carrier frequency correction amount calculation unit stops the calculation of the carrier frequency correction amount when the motor revolution speed becomes a predetermined revolution speed.

13 . The motor control device according to claim 9 , wherein
the carrier frequency correction amount calculation unit stops the calculation of the carrier frequency correction amount when the motor revolution speed becomes a predetermined revolution speed.

14 . A motor control method realized by a motor control device for a vehicle which is provided with a motor as a power source, the motor control method comprising:
a first upper-lower limit clipping step for performing upper-lower limit clipping with respect to a torque command relating to a torque generated by the motor; a torque ripple correction amount calculation step for calculating, on the basis of the torque command and a motor revolution speed of the motor, a torque ripple correction amount for suppressing torque ripples generated in the motor; a second upper-lower limit clipping step for performing upper-lower limit clipping with an upper limit torque greater than that in the first upper-lower limit clipping step with respect to a value obtained by executing torque ripple correction by subtracting the torque ripple correction amount from the torque command subjected to the upper-lower limit clipping in the first upper-lower limit clipping step; and a carrier frequency correction amount calculation step for calculating a carrier frequency correction amount for correcting a carrier frequency of a power converter for driving the motor, in order to reduce losses in the power converter which have been increased by the execution of the torque ripple correction.

Assignees

• Mitsubishi Electric Corp

Inventors

• Ogawa Yasufumi

Classifications

• H02P6/10 Primary

  Arrangements for controlling torque ripple, e.g. providing reduced torque ripple · CPC title

• H02P27/085

  wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency · CPC title

• B60L11/1803

  Operations & Transport · mapped topic

• B60L15/2063

  for creeping · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title