Brushless D-C motor

Claim 1

A brushless D-C motor of the type having a permanently magnetized rotor which has alternatingly opposite magnetic poles at its circumference; a plurality of stator windings arranged 90° apart with respect to each other; first and second galvanomagnetic transducers disposed in the motor 90° apart from each other for producing first and second control signals, respectively, the control signals being responsive to the position of the rotor; a plurality of semiconductive switching devices connected in series with associated ones of the stator windings, each for controlling a respective stator winding current, the semiconductive switching devices having conductive and nonconductive states selectable in response to the polarity of the first and second control signals; the brushless D-C motor further comprising: first and second controlled current generator means each for controlling current flowing through selected ones of the semiconductor switching devices which are associated with stator windings which are arranged 180° with respect to each other, each of said controlled current generator means having a control input for receiving a respective one of first and second input signals, and an output for conducting an output current proportional to said respective input signal; and first and second coupling means each having an input for receiving a respective one of the control signals, and an output terminal connected to said control input of an associated one of said controlled current generator means for providing said respective input signal.