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Multi-phase motor control apparatus and electric power steering apparatus using the same

  • US 9,667,179 B2
  • Filed: 05/04/2016
  • Issued: 05/30/2017
  • Est. Priority Date: 04/17/2013
  • Status: Expired due to Fees
First Claim
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1. A multi-phase motor control apparatus comprising:

  • a driving section comprising pairs of upper-stage arm switching elements and lower-stage arm switching elements, and driving a multi-phase motor;

    a single type current detection circuit detecting current values of said multi-phase motor;

    a PWM-signal generating section generating a first each-phase PWM-signals in respective control periods within two control periods based on said current values detected by said current detecting circuit and a carrier signal;

    a phase shift control section shifting a first PWM-signal of a predetermined phase, which is generated in said PWM-signal generating section, by gradually changing a phase shift amount within two control periods, and outputting said shifted first PWM-signal to said driving section; and

    a current detection observer estimating a current estimation value of said multi-phase motor based on said current values detected by said current detection circuit;

    wherein said PWM-signal generating section generates a second each-phase PWM-signals in respective control periods within two control periods based on said current estimation value and said carrier signal; and

    said PWM-signal generating section drives at first said multi-phase motor using said first each-phase PWM-signals;

    wherein in a case that a phase shift amount of a predetermined phase in a control period controlled by said first each-phase PWM-signals is zero and a phase shift amount of a predetermined phase in a control period controlled by next first each-phase PWM-signals is not zero, said phase shift control section gradually increases said phase shift amount from zero in a control period controlled by a second each-phase PWM-signals following said next first each-phase PWM-signals based on said phase shift amount calculated by said next first each-phase PWM-signals, and uses said second each-phase PWM-signals.

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