Control signal generator for the commutating device of a brushless electronics motor
AssigneeSiemens Aktiengesellschaft
InventorHermann Ebert
Life of this patent
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Abstract
The control signal generator contains two Hall effect generators which are shifted relative to each other by 90.degree. electrically and magnetically, alao a gating circuit which derives from the Hall signals control signals for the switching elements of the commutating device. In order to make it possible to drive the motor digitally, the invention provides that the gating circuit comprise a combinatorial circit and, succeeding it, a 1-of-4 logic circuit. The combinatorial circuit furnishes two digital drive signals whose switching instants are shifted correspondingly .+-.45.degree. electrically relative to the zero crossings of the Hall signals.
Claims10
A control signal generator for the commutating device of a brushless electronic motor comprising:
- (a) two Hall effect generators which are shifted relative to each other by 90.degree. electrically and magnetically and furnish Hall signals as a function of the rotor position;
- (b) a combinatorial circuit receiving said Hall signals and furnishing two digital drive signals whose switching instants are shifted by half the time span between two successive zero crossings of the Hall signals;
- and
- (c) a 1 to 4 logic circuit having as inputs the two drive signals and having an output which furnishes one control signal for each of the switching elements of the commutating device.
Dependencies are inferred from the claim text.