초록 ▼

The motor control circuit is coupled to the third wire, and includes a speed control circuit responsive to a speed control signal for generating the speed control voltage signal on the third wire at a voltage corresponding to a speed indicated by the speed control signal. It also includes a current

The motor control circuit is coupled to the third wire, and includes a speed control circuit responsive to a speed control signal for generating the speed control voltage signal on the third wire at a voltage corresponding to a speed indicated by the speed control signal. It also includes a current sensing circuit providing a speed signal, corresponding to the sensed speed current signal on the third wire, such that the voltage of the speed control voltage signal is substantially unaffected by changes in the current of the sensed speed current signal, and such that the current of the sensed speed current signal is substantially unaffected by changes in the voltage of the speed control voltage signal.

대표청구항 ▼

[ What is claimed is:] [1.] A two-phase brushless motor drive assembly, responsive to a speed control signal to control the rotational speed of a motor rotor, and providing a speed signal representative of the sensed speed of said rotor, comprising:a motor assembly, receiving a first wire providing

[ What is claimed is:] [1.] A two-phase brushless motor drive assembly, responsive to a speed control signal to control the rotational speed of a motor rotor, and providing a speed signal representative of the sensed speed of said rotor, comprising:a motor assembly, receiving a first wire providing electric power, a second wire providing a ground connection, and a third wire, comprisinga two-phase brushless motor, including a rotor, a motor drive circuit, responsive to a speed control voltage signal on said third wire and said electric power on said first wire, providing drive power to said motor to drive said rotor to a rotational speed determined by said speed control voltage signal, anda sensor circuit, including a sensor coupled to said motor, and being coupled to said third wire, providing a sensed speed current signal on said third wire, having a current representing the rotational speed of said rotor; anda motor control circuit coupled to said third wire, comprisinga speed control circuit coupled to said third wire, responsive to a speed control signal for generating said speed control voltage signal on said third wire at a voltage corresponding to a speed indicated by said speed control signal, anda current sensing circuit coupled to said third wire, providing a speed signal, corresponding to said sensed speed current signal on said third wire,such that the voltage of said speed control voltage signal is substantially unaffected by changes in the current of said sensed speed current signal, and such that the current of said sensed speed current signal is substantially unaffected by changes in the voltage of said speed control voltage signal.