Brushless DC motor start circuit that suppresses field excitatio

Details Brushless DC motor start circuit that suppresses field excitatio Brushless DC motor start circuit that suppresses field excitatio

1996-05-23

1998-02-10

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318431, H02P 620

Patent

active

057172986

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.

REFERENCES:
patent: 4641066 (1987-02-01), Nagata et al.
patent: 4876491 (1989-10-01), Squires et al.
patent: 4912378 (1990-03-01), Vukosavic
patent: 5068582 (1991-11-01), Scott
patent: 5130620 (1992-07-01), Inaji et al.
patent: 5144209 (1992-09-01), Ingji et al.
patent: 5254914 (1993-10-01), Dunfield et al.
patent: 5323094 (1994-06-01), Kaneda et al.

Affiliated with

Also associated with

Rating

Brushless DC motor start circuit that suppresses field excitatio does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Brushless DC motor start circuit that suppresses field excitatio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Brushless DC motor start circuit that suppresses field excitatio will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2079701