Method and apparatus for operating an electrical drive system
First Claim
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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Accused Products
Abstract
An electrical drive system includes an electric motor having an armature, which is mounted on a stator, and a rotor, wherein aligning stator flux with rotor flux enables current to flow in the armature without inducing torque on the rotor shaft. The disclosed operation may be used, for example, in testing the electrical drive system. The electric drive system can carry full rated current yet produce little or no torque, thereby increasing the current that can be tested during electrical drive test procedures without producing undesired forces or motion. The method may be used, for example, in heating the electric motor, for example for de-icing.
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Citations
23 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An electrical, drive system comprising:
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an electric motor having a stator, a rotor and an armature and being configured to produce mechanical motion to actuate a latching or unlatching mechanism; a control system configured to align flux produced by the stator with flux produced by the rotor; a rotor monitor for monitoring a position of the rotor; a quadrature-axis current controller; a direct-axis current controller configured to drive 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; and
;a feedback loop for controlling the direct axis current and/or the quadrature axis current in the armature to avoid or minimise rotation of the rotor, enabling the electrical drive system to carry full-rated or near full-rated current yet produce little or no torque. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification