Back to results
US 2011/0254479 A1Published application
Brushless motor rotation-position detection system
AssigneeMitsubishi Electric Corporation
InventorsRyo SAKAGUCHI, Makoto ITOI
Life of this patent
Estimating the term…
Abstract
A rotation-position detection system according to the present invention is configured with a resolver mounted in a brushless motor and a motor controller. The motor controller outputs an excitation signal to the resolver and an A/D converter thereof alternately applies analogue/digital conversion to a sine wave signal and a cosine wave signal outputted from the resolver so that a rotation position of the motor is calculated.
Claims12
A brushless motor rotation-position detection system comprising:
- a resolver mounted in a brushless motor;
- a motor controller for driving the brushless motor;
- and
- a calculation means (microcomputer) that performs calculation for controlling the motor, based on rotation-position information on the brushless motor, wherein the calculation means includes an excitation signal supply means that supplies an excitation signal to the resolver;
- an analogue/digital converter that applies analogue/digital conversion to a sine wave signal and a cosine wave signal outputted from the resolver;
- a resolver amplitude calculation means that calculates a sine wave amplitude and a cosine wave amplitude, based on the sine wave signal and the cosine wave signal obtained through the analogue/digital conversion by the analogue/digital converter;
- and a motor angle calculation means that calculates a motor rotation angle of the brushless motor, based on the sine wave amplitude and the cosine wave amplitude calculated by the resolver amplitude calculation means, and wherein the analogue/digital converter alternately applies analogue/digital conversion to a sine wave signal and a cosine wave signal that are outputted from the resolver after an excitation signal is supplied to the resolver.
4 more elements
Dependencies are inferred from the claim text.