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METHOD FOR ACTUATING A BRUSHLESS MOTOR

  • US 20160261221A1
  • Filed: 10/09/2014
  • Published: 09/08/2016
  • Est. Priority Date: 10/22/2013
  • Status: Active Grant
First Claim
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1. A method for operating an electronically commutated synchronous machine that comprises a stator having at least two, phase windings and a rotor that comprises at least one permanent magnet, said machine also comprising a control circuit that comprises at least two switches that are allocated to a phase winding, the method comprising:

  • determining a pulse control factor periodically for each individual phase winding;

    determining, based on said pulse control factor, time periods during which the phase winding is influenced by way of the allocated switch either with an upper supply voltage or with a lower supply voltage; and

    controlling the electronically commutated synchronous machine in accordance with a method of space vector modulation in which at the beginning and/or end of a period zero vectors are applied to the phase windings for a switch-off time duration,wherein in each case either all the switches that are connected to the upper supply voltage or all the switches that are connected to the lower supply voltage conduct, and the zero vector is selected in accordance with the phase winding having the greatest deviation from the mean pulse control factor, said mean pulse control factor corresponding to a mean value between the upper supply voltage and lower supply voltage.

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