Control arrangement for a brushless motor

Details Control arrangement for a brushless motor Control arrangement for a brushless motor

H - Electricity

02

K

310/38, 318/93

H02K 29/12 (2006.01) H02P 6/14 (2006.01)

Patent

CA 1114446

ABSTRACT The invention relates to a control circuit for a brushless self-starting D.C. motor of the type having a permanent magnet rotor and stator coils, a magnetic field-dependent component or sensing coil for sensing the position of the rotor, and controllable electronic switches in respective series with the stator coils and the D.C. source. The switches control current through the stator coils in dependence on the rotary position of the rotor pursuant to magnetic field dependent parameter changes in the sensing coil. The control circuit is characterized by including an oscillator with an LC resonant circuit of which the inductance is formed by the sensing coil. The circuit includes a modulator for modulating the oscillation of the oscillator in response to the induction changes brought about in the sensing coil. The control signals for the switches are derived from the modulated oscillator oscillation because the oscillator frequency is considerably higher than the rotor speed. The sensing coil is in fixed relation to the stator but has no particular circumferential position relative thereto. A metallic element is attached to the rotor which turns with the rotor past the sensing coil. The position of the sensing coil and the metallic element may be chosen at will independently of the stator coils. The metallic element may consist of soft iron and be attached to an end face of the rotor. The metallic element may have the shape of a segment and extend over an angle less than 180° Abstract...continued. so that with regard to the physical dimensions of the sensing coil, control signals displaced in phase through 180° are derivable from the signal of the sensing coil.

295170

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