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US 2017/0324364 A1Published application
Motor Control Using Phase Current and Phase Voltage
AssigneeAllegro MicroSystems, LLC
InventorYisong Lu
Life of this patent
Estimating the term…
Abstract
Methods and apparatus to control a three-phase BLDC motor using phase current and phase voltage at zero current detection and a driving current derived from a bus current, for example. The driving current can be combined with a difference angle with an output provided to a controller to control a speed of the motor/
Claims19
A method of controlling a three-phase BLDC motor, comprising:
- receiving a phase current direction for the BLDC motor;
- determining a first angular difference between a phase current and a phase voltage of the BLDC motor from a voltage driving angle corresponding to zero current detection for the phase current, wherein the driving angle corresponds to a range of zero to three-hundred sixty degrees;
- determining a second angular difference between an advance angle and the first angular difference;
- determining a driving current derived from at least one phase current of the BLDC motor;
- combining the second angular difference and the driving current to generate an output;
- and
- feeding the output to a control loop for controlling speed of the BLDC motor.
4 more elements
A system to control a three-phase BLDC motor, comprising:
- a first module to receive a phase current direction for the BLDC motor;
- a second module to determine a first angular difference between a phase current and a phase voltage of the BLDC motor from a voltage driving angle corresponding to zero current detection for the phase current, wherein the driving angle corresponds to a range of zero to three-hundred sixty degrees;
- a third module to determine a second angular difference between an advance angle and the first angular difference;
- a fourth module to determine a driving current derived from at least one phase current of the BLDC motor;
- a combiner to combine the second angular difference and the driving current to generate an output;
- and
- a control loop module having a computer processor to receive the output of the combiner for controlling speed of the BLDC motor.
4 more elements
Dependencies are inferred from the claim text.