Initial rotor position detection in a brushless DC motor
OwnerJanislav Segainventor
Life of this patent
Estimating the term…
Abstract
A method of operating a Brushless Direct Current Motor (BLDCM), the BLDCM of the type including: a series of concentric independently activated electromagnetic phase coils interacting with a series of permanent magnets to provide relative movement therebetween, the phase coils having temporal periods of activation time and deactivation time, the method including the steps of: (a) activating at least one of the phase coils for a short period of activation; and (b) measuring the voltage response across the phase coil of the deactivated phase coil during the short period of activation to determine the rotor position.
Claims14
A method of operating a Brushless Direct Current Motor (BLDCM), the BLDCM of the type including:
- a series of concentric independently activated electromagnetic phase coils interacting with a series of permanent magnets to provide relative movement therebetween, the phase coils having temporal periods of activation time and deactivation time, the method including the steps of:
- (a) activating at least one of the phase coils for a short period of activation, and applying a preceding short duration pulse to demagnetize the BLDCM stator core before measuring the voltage response across the phase coil;
- and
- (b) measuring the voltage response across the phase coil of the deactivated phase coil during the short period of activation to determine the rotor position.
A method of operating a Brushless Direct Current Motor (BLDCM), the BLDCM of the type including:
- a series of concentric independently activated electromagnetic phase coils interacting with a series of permanent magnets to provide relative movement therebetween, the phase coils having temporal periods of activation time and deactivation time, the method including the steps of:
- (a) activating at least one of the phase coils for a short period of activation;
- (b) measuring the voltage response across the phase coil of the deactivated phase coil during the short period of activation to determine the rotor position;
- and
- (c) measuring the voltage response during the on-time activation of the activation time across the phase coil (Von) and utilizing the on-time of the open phase winding voltages to determine an estimated rotor position.
Dependencies are inferred from the claim text.