Title:
SYNCHRONOUS MOTOR
Document Type and Number:
WIPO Patent Application WO/2000/019593
Kind Code:
A1
Abstract:
A small synchronous motor with high reliability so devised that transition from start operation to synchronous operation is ensured. A microcomputer (22) switching-controls the current application range to a range where the rectified current flowing through a rectifying bridge circuit (20) and a coil (A) alternately is inverted during one turn of a permanent magnet rotor (5) to suppress the input on the inverted side with respect to the non-inverted side and thereby to start a synchronous motor, turns off first to fourth transistors (16 to 19) when the rotational speed of the permanent magnet rotor (5) measured by an optical sensor (12) reaches near the synchronous speed regulated by the power source frequency and measured by a power source frequency measuring section (24), and turns on triacs (SW1, SW2), thereby making a switch to the synchronous operation circuit (21).
Inventors:
KOMATSU FUMITO (JP)
Application Number:
PCT/JP1999/002541
Publication Date:
April 06, 2000
Filing Date:
May 14, 1999
Export Citation:
Assignee:
KOMATSU FUMITO (JP)
International Classes:
H02P1/46; H02P1/50; H02P6/20; (IPC1-7): H02P1/46
Foreign References:
| JPS5556495A | 1980-04-25 | |||
| JPS59188383A | 1984-10-25 | |||
| JPS58170346A | 1983-10-06 |
Other References:
See also references of EP 1130757A4
Attorney, Agent or Firm:
Watanuki, Takao (Nakagosho 3-chome Nagano-shi Nagano, JP)
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