Conduction angle control of brushless motor
AssigneePanasonic Corporation
InventorHideharu Ogahara
Life of this patent
Estimating the term…
Abstract
An inverter controller for driving a brushless DC motor, of which rotor is provided with permanent magnets, includes an inverter circuit, a position sensing circuit, a DC voltage sensor, and a conduction angle controller. The inverter circuit is connected to the brushless DC motor for driving this motor. The position sensing circuit senses a rotor position with respect to a stator from an induction voltage of the brushless DC motor. The DC voltage sensor senses a voltage value of a DC power voltage supplied to the inverter circuit. The conduction angle controller changes a conduction angle of the inverter circuit within a range less than 180 degrees in electric angles in response to a rate of change in the DC power voltage.
Claims12
An inverter controller for driving a brushless DC motor having a stator and a rotor which includes permanent magnets, the inverter controller comprising:
- an inverter circuit coupled to the brushless DC motor configured to drive the brushless DC motor;
- a position sensing circuit configured to sense a position of the rotor with respect to the stator from an induction voltage of the brushless DC motor;
- a DC voltage sensor configured to sense a voltage value of a DC power voltage supplied to the inverter circuit;
- and
- a conduction angle controller configured to change a conduction angle of the inverter circuit within a range from over 0 degree to less than 180 degrees in electric angles in response to a rate of change in the DC power voltage.
Dependencies are inferred from the claim text.