초록 ▼

A controller controls the running speed of a variable speed motor of the type which runs at a speed related to the duty cycle of a pulse width modulated drive voltage applied to it and to the load being applied. The controller includes a setting switch for setting the motor running speed and a devic

A controller controls the running speed of a variable speed motor of the type which runs at a speed related to the duty cycle of a pulse width modulated drive voltage applied to it and to the load being applied. The controller includes a setting switch for setting the motor running speed and a device for measuring the load being applied to the motor. Also included is a data storage for storing data representing a plurality of different pulse width modulation duty cycles for driving the motor at various desired motor running speeds and with various loads being applied to the motor. A processor is operatively connected to the setting switch, the load measuring device and the data storage for generating signals representing a particular duty cycle corresponding to a desired running speed setting and applied load to result in the desired motor speed. The processor generates these signals at a predetermined time interval to reach and maintain the desired motor speed. A voltage applying device is provided for applying the pulse width modulated voltage having the particular duty cycle to the motor.

대표청구항 ▼

[ What is claimed is:] [1.] A controller for controlling the running speed of a variable speed motor of the type which runs at a speed related to the duty cycle of a pulse width modulated drive voltage applied to it and to the load being applied, said controller comprising:means for setting a motor

[ What is claimed is:] [1.] A controller for controlling the running speed of a variable speed motor of the type which runs at a speed related to the duty cycle of a pulse width modulated drive voltage applied to it and to the load being applied, said controller comprising:means for setting a motor running speed;means for measuring a load being applied to the motor;storage means for storing data representing a plurality of different pulse width modulation duty cycles for driving the motor at various desired motor running speeds and with various loads being applied to the motor;processing means operatively connected to said setting means, said load measuring means and said storage means for generating signals representing a particular duty cycle corresponding to a desired running speed setting and applied load to result in said desired motor speed, said processing means generating said signals at a predetermined time interval to reach and maintain said desired motor speed;means for applying said pulse width modulated voltage having said particular duty cycle to the motor; and,signal driving means, operatively connected between said processing means and said applying means, for supplying said signals generated by said processing means to said applying means, and including means for stopping said signals from said processing means to said applying means in an event of a processing means failure.