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Method and apparatus for operating an electrical drive system

  • US 9,391,556 B2
  • Filed: 01/08/2013
  • Issued: 07/12/2016
  • Est. Priority Date: 01/12/2012
  • Status: Active Grant
First Claim
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1. A method of testing an electrical drive system comprising an electric motor connected to a latching or unlatching mechanism for actuation thereof, the drive system having a stator, a rotor and an armature, and which can be represented as having two armature phases, the method comprising:

  • i) driving the motor in accordance with a non-zero current demand profile, which profile requires driving the motor at full-rated or near full-rated current to produce a direct axis current in the armature and/or a quadrature axis current in the armature;

    ii)aligning flux produced by the stator with flux produced by the rotor;

    iii) monitoring the position of the rotor; and

    iv) controlling the direct axis current in the armature and/or the quadrature axis current in the armature to avoid or minimise rotation of the rotor, thereby producing little or no torque at full-rated or near full-rated current without breaking the latching or unlatching mechanism.

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