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US 8,541,964 B2Granted
Brushless motor rotation-position detection system
AssigneeMitsubishi Electric Corporation
InventorsRyo Sakaguchi, Makoto Itoi
Life of this patent
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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.
Claims14
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 microcomputer comprising calculation means 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 alternately applies analogue/digital conversion to a sine wave signal and a cosine wave signal outputted from the resolver after an excitation signal is supplied to 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, wherein the analogue/digital converter determines whether to convert the sine wave signal or the cosine wave signal based on a counter value stored in the microcomputer.
7 more elements
Dependencies are inferred from the claim text.