Title:
THREE-PHASE BRUSHLESS MOTOR
Document Type and Number:
WIPO Patent Application WO/1984/002810
Kind Code:
A1
Abstract:
A three-phase brushless motor having magnetoelectric transducers for detecting the rotational position of a rotor (2) having a plurality of magnetizable regions, two of the magnetoelectric transducers being disposed in such a positional relation as to have an electrical angle of 120o or 240o, thereby to obtain composite signals with a phase difference of 120o from the output signals of the magnetoelectric transducers, respectively, so that the driving current to be fed to a stator coil (1) is determined by the composite signals and the output signals of the magnetoelectric transducers, wherein an auxiliary magnetic pole (2b) opposite in polarity to a main magnetic pole (2a) is provided near a portion of the rotor (2) opposing to each magnetoelectric transducer in order to steepen the waveform of the output signal from each magnetoelectric transducer at the zero-crossing point of the waveform of the composite signal, thereby to feed an excellent driving current to the stator coil (1) and improve the torque unevenness.
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Inventors:
SAKAMOTO SATOSHI (JP)
UZUKA MITSUO (JP)
UZUKA MITSUO (JP)
Application Number:
PCT/JP1983/000463
Publication Date:
July 19, 1984
Filing Date:
December 28, 1983
Export Citation:
Assignee:
SONY CORP (JP)
International Classes:
H02K1/27; H02K29/00; H02K29/08; (IPC1-7): H02K29/00
Foreign References:
| JPS57206263A | 1982-12-17 | |||
| JPS5441406A | 1979-04-02 | |||
| JPS54111609A | 1979-09-01 | |||
| JPS4712408U | 1972-10-14 |
Other References:
See also references of EP 0131632A1
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