초록 ▼

In a brushless dc motor, commutation is performed without the use of rotor position sensors. A voltage across a non-conducting winding of the motor is measured, a voltage across a conducting winding of the motor is computed, an emf Park vector is computed from the voltages, an imaginary component of

In a brushless dc motor, commutation is performed without the use of rotor position sensors. A voltage across a non-conducting winding of the motor is measured, a voltage across a conducting winding of the motor is computed, an emf Park vector is computed from the voltages, an imaginary component of a rotated emf Park vector is extracted, and the imaginary component is processed to determine when to perform the commutation from one winding to the next sequential winding.

대표청구항 ▼

[ We claim:] [1.] A method of operating a brushless dc motor, the motor including a plurality of motor windings, the method comprising the steps of:determining a back emf voltage across a non-conducting winding of the motor;determining a voltage across a conducting winding of the motor;determining a

[ We claim:] [1.] A method of operating a brushless dc motor, the motor including a plurality of motor windings, the method comprising the steps of:determining a back emf voltage across a non-conducting winding of the motor;determining a voltage across a conducting winding of the motor;determining an emf Park vector from the determined voltages;extracting a component from the determined voltages; andprocessing the component to determine when to perform commutation.