Electric motor control having DC-DC converter and method of using same
AssigneeGeneral Motors Corporation
InventorsKhwaja M. Rahman, Steven E. Schulz
Life of this patent
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Abstract
A controller for use in a switched reluctance (SR) motor drive is provided. The controller includes a DC—DC converter coupled to an inverter. The DC—DC converter can be a buck converter, a boost converter, or a buck-boost converter. The control parameters to the DC—DC converter can be optimal. In addition, the bus voltage of the motor drive can be reduced to a level such that the motor operates in single pulse mode. A capacitor can be connected in parallel across the outputs of the DC—DC converter supplying the inverter. Using the DC—DC converter to indirectly profile the phase current can reduce motor torque ripple.
Claims16
A control system for an electric motor, comprising:
- a position sensor for detecting the rotor position of a switched reluctance (SR) motor;
- a position decoder operatively coupled to the position sensor;
- an angular velocity calculator operatively coupled to the position decoder;
- a DC—DC converter having a plurality of inputs for connecting to a DC power supply and a plurality of outputs;
- a switched reluctance motor inverter operatively coupled to the electric motor having a plurality of inputs connected to the outputs of the DC—DC converter;
- and
- a means for regulating a DC bus voltage to profile phase current in the electric motor.
A motor controller, comprising:
- a position sensor for detecting the rotor position of a switched reluctance (SR) motor;
- a position decoder operatively coupled to the position sensor;
- an angular velocity calculator operatively coupled to the position decoder;
- a look-up table for storing a plurality of control parameters;
- an interpolator, operatively coupled to the look-up table and the angular velocity calculator, for outputting a reference voltage and phase indicator;
- a DC—DC converter for receiving the reference voltage and a DC supply voltage;
- and
- an inverter operatively coupled to one or more phase windings of the SR motor and the outputs of the DC—DC converter.
Dependencies are inferred from the claim text.