Saliency tracking for brushless Dc motors and other permanent magnet synchronous motors
OwnerKai Yininventor
Life of this patent
Estimating the term…
Abstract
Saliency tracking for brushless direct current (BLDC) motors and other permanent magnet synchronous motors (PMSMs) is provided. Embodiments generate an accurate estimate of rotor position for use in field-oriented control (FOC) of BLDC motors. In addition, a robust saliency tracking algorithm provides for the use of BLDC motors in low-speed high-torque applications without the need of external sensors. This enables sensorless application of higher level algorithms as well, such as servo control. In addition, accurate measurement of motor phase inductance and flux linkage can be provided without any additional equipment.
Claims22
A method for estimating rotor position of a synchronous machine, the method comprising:
- (a) injecting a voltage into the synchronous machine;
- (b) measuring a current responsive to the voltage injected at (a);
- and
- (c) estimating the rotor position of the synchronous machine based at least in part on the current measured at (b).
A rotor position estimator for a synchronous machine, comprising:
- a voltage generator configured to inject a voltage into the synchronous machine;
- a detector configured to measure a current responsive to the voltage injected by the voltage generator;
- and
- a phase-locked loop (PLL) configured to estimate a rotor position of the synchronous machine based at least in part on the current measured by the detector.
Dependencies are inferred from the claim text.