Electronically commutating motor
AssigneeU.S. Philips Corporation
InventorBernardus H. A. Goddijn
Life of this patent
Estimating the term…
Abstract
An electronically commutating motor having a phase winding connected in at least one of the branches of a bridge circuit. A comparator measures the voltage across one of the diagonals of the bridge and switches the voltage across the other bridge diagonal as a function of the polarity of the first-mentioned voltage.
Claims15
An elecctronically commutating motor comprising, a bridge circuit having a first impedance connected between a first point and a second point, a second impedance connected between the second point and a third point, a third impedance connected between the third point and a fourth point, and a fourth impedance connected between the fourth point and the first point, and comparator means having a first and a second input connected to the second and the fourth point, respectively, for comparing the voltages at the second and the fourth points, and having an output for energizing the bridge circuit between the first and the third points as a function of an output signal at said output of said comparator means, and wherein at least one of the first and third impedances comprises a stator phase winding of the motor.
A control circuit of electronically commutating a motor comprising, a bridge circuit having first and third input terminals and second and fourth output terminals, first and second impedances serially connected between the first and third terminals with a junction therebetween forming said second output terminal, third and fourth impedances serially connected between the first and third terminals with a junction therebetween forming said fourth output terminal, a comparison device having first and second input terminals connected to the second and fourth bridge output terminals for comparing a voltage appearing thereat, said comparison device having output means, means coupling said first and third bridge input terminals across the comparison device output means so that the bridge circuit is energized by an output signal produced at the comparison device output means, and means for coupling the bridge circuit to the motor so that at least one of said first and third impedances comprises a stator winding of the motor.
Dependencies are inferred from the claim text.