Patent ID: 9143068
Filing Date: 2015-09-22
Classification: H02P

Abstract:
1. An estimating method for a rotor position of a motor comprising: injecting, by using a computer, a first high frequency signal to the motor at a first estimating angle; generating, by using a computer, a first sensing signal of the motor in a period when the first high frequency signal is injected to the motor; injecting, by using a computer, a second high frequency signal to the motor at a second estimating angle, wherein the second estimating angle is different from the first estimating angle; generating, by using a computer, a second sensing signal of the motor in a period when the second high frequency signal is injected to the motor; determining, by using a computer, a quadrant of an operating angle according to the first sensing signal and the second sensing signal, wherein the operating angle is twice as large as an angle difference between the first estimating angle and the rotor position; and acquiring, by using a computer, the rotor position according to the first sensing signal, the second sensing signal, and the quadrant of the operating angle.