Title:
MORSE START CIRCUIT AND CONTROL METHOD THEREFOR
Document Type and Number:
Japanese Patent JPH09163789
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To allow no large start current to flow in a motor output means by permitting the detection of zero crossing point. SOLUTION: A rectifier means 10 generates an exciting current. A mode conversion means 20 switches Morse start mode to general start mode and vice versa so as to rectify a motor output means. A model reference zero crossing generating means 30 generates a signal to detect the rotational direction of the motor. A zero crossing detecting means 40 compares a model reference zero crossing signal with an actual zero crossing signal generating during rotation of the motor so as to detect the rotational direction thereof. A phase selection means 50 selects one phase at a time when a coil of each phase of the motor is not excited. A second modulating means 60 widens/shortens the pulse width of exciting current to adjust the exciting current when the starting of motor is failed. A second modulating means 70 adjusts the power-off time interval to be supplied to the motor when the starting of motor is failed.
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Inventors:
TOU SHIMEI
RI SANYOU
RI SANYOU
Application Number:
JP24381396A
Publication Date:
June 20, 1997
Filing Date:
September 13, 1996
Export Citation:
Assignee:
SAMSUNG ELECTRONIC
International Classes:
H02H7/08; H02P1/22; H02P6/06; H02P6/08; H02P6/18; H02P6/182; H02P6/21; (IPC1-7): H02P6/18; H02H7/08
Attorney, Agent or Firm:
Hagiwara Makoto