초록 ▼

A control system for an AC motor driven cyclic load, such as a beam pumping unit, includes a flywheel, transducer, tachometer, outside set point source, controller, and variable frequency power supply. The flywheel is rotatably connected between the motor and the cyclic load for receiving and storin

A control system for an AC motor driven cyclic load, such as a beam pumping unit, includes a flywheel, transducer, tachometer, outside set point source, controller, and variable frequency power supply. The flywheel is rotatably connected between the motor and the cyclic load for receiving and storing rotational kinetic energy from the motor and the load during portions of a cycle of the cyclic load when there is excess energy and returning the stored rotational kinetic energy to drive the cyclic load during portions of a cycle when there is an energy demand by the cyclic load. The transducer generates a transducer signal which is a function of the cycle speed. The tachometer means generates a tachometer signal which is a function of the speed of rotation of the motor\s rotor. The outside set point source generates an outside set point signal representative of a desired set point cycle speed of the cyclic load. The controller receives the transducer signal, the tachometer signal and the outside set point signal and generates a control signal representative of the adjustment to the power supply frequency of the motor needed to achieve the set point cycle speed. The variable frequency power supply receives the control signal and adjusts the frequency of the power supplied to the motor accordingly.

대표청구항 ▼

A control system for an AC motor driven cyclic load, the AC motor having a rotor driven by a magnetic field, the system comprising: a flywheel, rotatably connectable between the motor and the cyclic load, for receiving and storing rotational kinetic energy from the motor and the load, and for delive

A control system for an AC motor driven cyclic load, the AC motor having a rotor driven by a magnetic field, the system comprising: a flywheel, rotatably connectable between the motor and the cyclic load, for receiving and storing rotational kinetic energy from the motor and the load, and for delivering rotational kinetic energy to the load; transducer means for generating a transducer signal which is a function of the cycle speed of the cyclic load; tachometer means for generating a tachometer signal which is a function of the speed of rotation of the motor\s rotor; outside set point means for generating an outside set point signal representative of a desired set point cycle speed of the cyclic load; controller means for receiving and processing the transducer signal, the tachometer signal, and the outside set point signal to generate a control signal representative of the adjustment to the power supply frequency needed to achieve the set point cycle speed; and variable frequency power supply means, having a power input connectable to an AC power source and a power output connectable to the motor, for receiving and processing the control signal to adjust the frequency of the power supplied to the AC motor and thereby achieve the set point cycle speed of the cyclic load.