초록 ▼

A device which intervenes between an electric switch and a motor which it controls, such intervention reducing the number of times the motor is powered on by keeping the motor running. The device calculates the difference in the amount of energy used in starting compared with normal running. Then, i

A device which intervenes between an electric switch and a motor which it controls, such intervention reducing the number of times the motor is powered on by keeping the motor running. The device calculates the difference in the amount of energy used in starting compared with normal running. Then, it calculates how long the motor must be turned off, if turning it off is to be economical. If the motor is turned off for a period which is not economical, the motor control device will intervene and keep the motor running until it is no longer economical to keep it running. In applications where an industrial tool is being used so frequently that it is being stopped, then started again in short intervals, this device would keep the tool running constantly until a sufficient period since the last use has lapsed and the device is allowed to shut the motor off.

대표청구항 ▼

[ I claim:] [1.] A control system comprising: a load, a load power source, an external control signal, and a control device, the control device is connected between the power source and the load, the control device receives the external control signal, and the control device measures the amount of e

[ I claim:] [1.] A control system comprising: a load, a load power source, an external control signal, and a control device, the control device is connected between the power source and the load, the control device receives the external control signal, and the control device measures the amount of energy consumed by the load during start-up and measures the rate of energy consumption by the load during steady state, the control device determining an equivalency time as the amount of time the load will take to consume the same energy in steady-state that the load consumes during start-up, the control device connecting the power source to the load after the external signal indicates that the load should be disconnected from the power source for the equivalency time, and the control device disconnecting the power source from the load unless the external signal indicates within the equivalency time that the power source should be reconnected to the load.