Title:
モールススタート回路およびその制御方法
Document Type and Number:
Japanese Patent JP3600894
Kind Code:
B2
Abstract:
During start-up a telegraph-start circuit for a DC motor withholds exciting current from the stator field coils during alternative ones of the polyphase commutation signals used when the motor is running. This produces a high starting torque at an initial time overcoming dead-point, head-sticking and insufficient-initial-starting-torque problems in motor drive applications, while avoiding rail-to-rail short-through problems in the driver circuitry. Commutation-stop and power-OFF time control lowers dissipation required of field coil driver circuitry by periodically interrupting starting current flow into the DC motor field coils. The telegraph-start circuit includes an adjustable-rate clock generator, a commutation-stop and power-OFF time controller, a ring counter, a dual-mode commutation circuit, field coil driver circuitry, a zero-crossing reference generator, a phase selector, a zero-crossing detector, and a condition-of-rotation detector.
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Inventors:
Akira Yushi
Lee Sang-yo
Lee Sang-yo
Application Number:
JP24381396A
Publication Date:
December 15, 2004
Filing Date:
September 13, 1996
Export Citation:
Assignee:
Samsung Electronics Co.,Ltd.
International Classes:
H02H7/08; H02P1/22; H02P6/06; H02P6/08; H02P6/18; H02P6/182; H02P6/21; (IPC1-7): H02P6/18; H02H7/08
Domestic Patent References:
| JP7327394A | ||||
| JP7284293A | ||||
| JP7087785A | ||||
| JP6178581A | ||||
| JP3173395A | ||||
| JP1255495A |
Attorney, Agent or Firm:
Makoto Hagiwara