Method and apparatus for brushless electrical machine control
AssigneeBrooks Automation US, LLC
InventorsJairo T. MOURA, Nathan SPIKER, Aaron GAWLIK, Jayaraman KRISHNASAMY
Life of this patent
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Abstract
A variable reluctance motor load mapping apparatus includes a frame, an interface disposed on the frame configured for mounting a variable reluctance motor, a static load cell mounted to the frame and coupled to the variable reluctance motor, and a controller communicably coupled to the static load cell and the variable reluctance motor, the controller being configured to select at least one motor phase of the variable reluctance motor, energize the at least one motor phase, and receive motor operational data from at least the static load cell for mapping and generating an array of motor operational data look up tables.
Claims19
A method comprising:
- coupling a load to an output shaft of a variable reluctance motor;
- generating an array of static torques on the output shaft with the variable reluctance motor;
- adjusting a rotor position of the variable reluctance motor;
- and
- recording, with a controller, motor data that includes a static torque value, rotor position, and phase currents for adjacent phases of the variable reluctance motor.
A brushless electric machine comprising:
- a passive rotor with at least one rotor pole;
- a stator with at least one stator pole and a phase coil associated with each of the at least one stator pole;
- wherein the phase coil is configured to establish a flux in a magnetic circuit between the rotor and stator where the rotor and stator define a predetermined electric machine form factor;
- and
- a controller configured to control current to each phase coil to generate a predetermined rotor torque, the controller being programmed with at least predetermined constant torque values and related phase current values so that the controller determines the current for each phase coil for the generation of demanded rotor torque based on the predetermined constant torque values and related phase current values.
A brushless electric machine comprising:
- a passive rotor with at least one rotor pole;
- a stator with at least one stator pole and a phase coil associated with each of the at least one stator pole;
- wherein the phase coil is configured to establish a flux in a magnetic circuit between the rotor and stator where the rotor and stator define a predetermined electric machine form factor;
- and
- a controller configured to control current to each phase coil to generate a predetermined rotor torque, the controller being programmed so that a non-zero phase current is provided to each phase coil at a motor output of zero torque.
Dependencies are inferred from the claim text.