EP0748039A2
Expired / Lapsed
EP
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Rotation position detecting device and motor device
Assignee: Sony Corp
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Filing: 1996-06-07
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Granted: —
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Expires: 2016-06-07
Abstract
Abstract The present invention provides a rotation position detecting circuit for a sensor-less motor, and a motor device, which do not use a back electro-motive voltage. A motor (1) is rotated and driven by adding a sensor signal having a high frequency to a sine wave drive signal and a cosine wave drive signal through adders (5S) and (5C), respectively. A sensor signal is extracted and demodulated from a signal flowing in the motor (1) by a band pass filter (9), and this is defined as a rotation position detection signal. In the sensor signal from the band pass filter (9), its current value is changed corresponding to a change of an impedance resulting from a rotation of a magnet of the motor. It is possible to detect the rotation position of a rotor magnet, by detecting the change of the current value.
Inventors
- 👤 Yasumasa Kyodo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 14:04
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P6/183
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
173 words
A rotation position detecting device, characterized in that said rotation position detecting device comprises: a periodic signal outputting means (2) for outputting periodic signals which are out of phase by a predetermined angle from each other for sending to respective phases of a motor (1) having a plurality of phases; a sensor signal outputting means (3) for outputting a sensor signal having a higher frequency than that of said periodic signal; an adding means (5S, 5C) for adding the sensor signal from said sensor signal outputting means (3) to the periodic signal from said periodic signal outputting means (2) and sending the result to each of the phases of said motor (1) as a motor drive signal; and a rotation position detecting means (9, 10) for detecting the motor drive signal sent to each of said phases and also extracting each of the sensor signals from each of the motor drive signals, and outputting each of the extracted sensor signals as a rotation position detection signal indicating a rotation position of said motor.
Claim 2
Dependent Claim
19 words
A rotation position detecting device according to Claim 1, characterized in that said periodic signal is a sine wave.
Claim 3
Dependent Claim
21 words
A rotation position detecting device according to claim 2, characterized in that said sine wave is a constant current drive signal.
Claim 4
Dependent Claim
73 words
A rotation position detecting device according to claim 3, characterized in that said rotation position detecting device further comprises a standard position detection signal outputting means (43) for determining a standard position of said motor based on a level of said rotation position detection signal obtained relative to a pole number of said motor while said motor is rotated one turn, and for outputting a standard position detection signal at this determined timing.
Claim 5
Dependent Claim
49 words
A rotation position detecting device according to Claim 3, characterized in that said rotation position detecting device (57-58) further comprises a resolver/digital converter for digitizing and outputting each of the sensor signals from said rotation position detecting means, based on the sensor signal from said sensor signal outputting means.
Claim 6
Dependent Claim
80 words
A rotation position detecting device according to Claim 3, characterized in that said rotation position detecting device further comprises a memory means (66) for storing a value of the sine wave signal when jitter component of a load of said motor (1) or information corresponding to jitter component becomes minimum, as an optimum drive pattern for said motor, and a controlling means (65) for rotating and driving said motor based on said optimum drive pattern stored in said memory means.
Claim 7
Dependent Claim
50 words
A rotation position detecting device according to Claim 3, characterized in that said rotation position detecting device detects a zero-crossing point of said motor drive signal sent to said motor, samples the sensor signal extracted from said motor drive signal at this zero-crossing detection timing and detects the rotation position.
Claim 8
Dependent Claim
44 words
A rotation position detecting device according to Claim 3, characterized in that said rotation position detecting device corrects the voltage of the sensor signal extracted from said motor drive signal based on the sine wave signal from said sine wave signal outputting means (2).
Claim 9
Dependent Claim
68 words
A rotation position detecting device according to Claim 8, characterized in that said rotation position detecting device detects a point at which current values in the respective phases of said motor are equal to each other, samples the sensor signal extracted from said motor drive signal at this detected timing and corrects the sampled value based on the sine wave signal from said sine wave signal outputting means.
Claim 10
Dependent Claim
65 words
A rotation position detecting device according to Claim 3, characterized in that said rotation position detecting device sets the sine wave signal from said sine wave signal outputting means to 0 when a servo condition of said motor is disordered, and sends only the sensor signal from said sensor signal outputting means as said motor drive signal to each of the phases of said motor.
Claim 11
Dependent Claim
54 words
A rotation position detecting device according to Claim 3, characterized in that said rotation position detecting device adds an offset signal to said motor drive signal transiently, detects a phase difference between the sensor signal extracted from said motor drive signal when this offset signal is added, and thereby judges a motor rotation direction.
Claim 12
Dependent Claim
54 words
A motor device characterized in that said motor device comprises a rotation position detecting device according to any one of claims 1 to 11, and wherein there is provided a means for carrying out a rotation phase control of said motor corresponding to the rotation position detection signal from said rotation position detecting means.
References Cited (Backward Citations)
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