Motor drive circuit with emergency auxiliary power supply energi

Details Motor drive circuit with emergency auxiliary power supply energi Motor drive circuit with emergency auxiliary power supply energi

1993-11-04

1996-02-27

Young, W. R.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

318560, G11B 2102

Patent

active

054953723

ABSTRACT:
A motor drive circuit for driving an electromotor having a permanent magnet rotor and a stator comprising one or more stator windings. When the supply voltage of the motor drive circuit fails, an emergency signal is generated by a signal generator. This emergency control signal activates an auxiliary power supply circuit for extracting electric energy from the motor and supplying the extracted energy to an auxiliary circuit. The auxiliary power supply circuit comprises a rectifier circuit formed by the fly back diodes bridging the switches of an electronic commutation circuit. The drive circuit comprises short-circuit switches bridging the stator windings. In response to the emergency control signal a short-circuit apparatus causes the stator windings to be temporarily intermittently short-circuited. As a result, a capacitor is charged. The energy stored in the capacitor is used for temporarily energizing the auxiliary circuit once the power supply to the drive circuit has failed. If the drive circuit is used with a hard disc drive, the energy supplied by the auxiliary power supply circuit can be used for moving the magnetic head to an idle position.

REFERENCES:
patent: 4371903 (1983-02-01), Lewis
patent: 4786995 (1988-11-01), Stupeck et al.

Affiliated with

Also associated with

Rating

Motor drive circuit with emergency auxiliary power supply energi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Motor drive circuit with emergency auxiliary power supply energi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor drive circuit with emergency auxiliary power supply energi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1683267