Patent ID: 9391556
Filing Date: 2016-07-12
CPC Classification: B60L,H02M,H02P,Y02B

Claim Text:
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.