Winding voltage balancing circuit for brushless DC motor

Details Winding voltage balancing circuit for brushless DC motor Winding voltage balancing circuit for brushless DC motor

1982-11-29

1985-01-15

Witkowski, Stanley J.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02K 2900

Patent

active

044940530

ABSTRACT:
In a brushless DC motor having a magnet and multiphase coils, a current is distributed from a DC voltage source to the multiphase coils according to a set of output signals of a position detector for detecting the relative position between the magnet and the multiphase coils. First and second sets of output transistors are used so as to distribute a current to the corresponding multiphase coils. A first distributor selectively activates the first output transistors corresponding to the output signals of the position detector so as to supply the multiphase coils with a current according to a command signal, and a second distributor also selectively activates the second output transistors corresponding to the output signals of the position detector. A second distributor has a voltage drop controller for detecting voltage drops across the first set of output transistors (or the second set of output transistors) in each activated period and for controlling output currents of the second set of output transistors so as to maintain the voltage drops across the first set of output transistors (or the second set of output transistors) in each activated period at a predetermined value regardless of the relative position between the magnet and the multiphase coils.

REFERENCES:
patent: 3783359 (1974-01-01), Malkiel
patent: 4035700 (1977-07-01), Kawasaki et al.
patent: 4047081 (1977-09-01), Liska
patent: 4278921 (1981-07-01), Medding et al.
patent: 4292575 (1981-09-01), Kuhnlein et al.
patent: 4376261 (1983-03-01), Heide et al.
patent: 4403174 (1983-09-01), Miyazaki et al.

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