Control electronics for brushless motors

Abstract

An electronic control circuit for a brushless motor has an input power circuit providing a DC voltage and a microcontroller integrated circuit receiving the DC voltage. The microcontroller integrated circuit provides three-phase control signals according to a space vector control method. A microprocessor connected to the microcontroller integrated circuit executes supervisory control over the electronic control circuit. An inverter circuit receives the three-phase control signals from the microcontroller integrated circuit and provides driving signals to the brushless motor based on the three-phase control signals received from the microcontroller integrated circuit.

What is claimed is: 
     
         1 . An electronic control circuit for a brushless motor, comprising:
 an input power circuit providing a DC voltage;   a microcontroller integrated circuit receiving the DC voltage and providing three-phase control signals according to a space vector control method;   a microprocessor connected to said microcontroller integrated circuit and executing supervisory control over the electronic control circuit; and   an inverter circuit receiving the three-phase control signals from the microcontroller integrated circuit and providing driving signals to the brushless motor based on the three-phase control signals received from said microcontroller.   
     
     
         2 . The electronic control circuit according to  claim 1 , wherein the supervisory control includes controlling the torque during start-up and at steady-state in accordance with a smooth torque control profile. 
     
     
         3 . The electronic control circuit according to  claim 1 , wherein the supervisory control includes selection of the operating speed of the brushless motor. 
     
     
         4 . The electronic control circuit according to  claim 1 , wherein the supervisory control includes fast or soft braking of the brushless motor. 
     
     
         5 . The electronic control circuit according to  claim 1 , wherein the supervisory control includes start-up of the brushless motor.