Drive-circuit of a brushless DC motor

Details Drive-circuit of a brushless DC motor Drive-circuit of a brushless DC motor

1997-10-17

2000-04-18

Nappi, Robert E.

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02K 2300

Patent

active

060519444

ABSTRACT:
Drive circuit for a brushless, electronically commutated DC motor, wherein an electronic switching element (T.sub.1, T.sub.2) is arranged in series with each phase winding (L.sub.1, L.sub.2) of the motor and the switching elements (T.sub.1, T.sub.2) are driven in response to a sensor (2) for the rotational position of the rotor, in particular formed as a digital Hall IC, wherein each phase winding (L.sub.1, L.sub.2) is connected to a common node (8) of the circuit via a respective decoupling diode (D.sub.1, D.sub.2), and wherein parallel to the phase windings (L.sub.1, L.sub.2) and the corresponding decoupling diodes (D.sub.1, D.sub.2) a protective transistor circuit (10) is arranged that is driven in such a manner that the inductively induced voltage peaks are eliminated.

REFERENCES:
patent: 4594535 (1986-06-01), Morikawa
patent: 4598240 (1986-07-01), Cale et al.

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