Adaptive control of motor stator current waveform profiles
First Claim
1. A method for controlling a motor having a plurality of stator windings coupled to a controller, said method comprising the steps of:
- storing a plurality of motor control schemes, each stored motor control scheme effecting a respective stator current waveform profile;
generating control signals in response to a motor operating function to energize the stator windings with a current waveform profile corresponding to a first one of the motor control schemes;
monitoring a condition extrinsic to the motor;
sensing when the condition monitored in the monitoring step meets or exceeds a threshold;
selecting a second one of the stored motor control schemes in response to the sensing step; and
generating motor control signals in accordance with the motor control scheme selected in the selecting step to energize the stator windings with a current waveform profile corresponding to the second motor control scheme.
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Accused Products
Abstract
Subject to user or system selection, one of the motor control schemes is accessed from the memory by a controller for implementation. The controller generates control signals that are applied to energization circuitry for supplying current to the phase windings with a particular current waveform profile in accordance with the selected motor control scheme. The controller has an input terminal for receiving a user initiated torque command signal representing a desired motor torque. Each motor control scheme provides motor driving current that corresponds to torque command signals received at the controller input terminal.
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Citations
19 Claims
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1. A method for controlling a motor having a plurality of stator windings coupled to a controller, said method comprising the steps of:
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storing a plurality of motor control schemes, each stored motor control scheme effecting a respective stator current waveform profile;
generating control signals in response to a motor operating function to energize the stator windings with a current waveform profile corresponding to a first one of the motor control schemes;
monitoring a condition extrinsic to the motor;
sensing when the condition monitored in the monitoring step meets or exceeds a threshold;
selecting a second one of the stored motor control schemes in response to the sensing step; and
generating motor control signals in accordance with the motor control scheme selected in the selecting step to energize the stator windings with a current waveform profile corresponding to the second motor control scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A motor control system comprising:
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a motor having a plurality of stator windings;
energization circuitry for providing energization current to the stator windings from a power supply;
a controller coupled to the energization circuitry;
storage means coupled to the controller, the storage means having stored therein a plurality of different motor control schemes, each scheme, when applied by the controller, effecting a respective one of a plurality of motor stator energization current waveform profiles; and
condition sensing means coupled to the controller for sensing at least one condition extrinsic to the motor;
wherein the controller is dynamically responsive to the condition sensing means to access the motor control schemes from the storage means to energize the motor stator windings with corresponding current waveform profiles in accordance with criteria associated with sensed conditions. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification