초록 ▼

A crane motor control is disclosed which includes a variable D.C. voltage supply in a Ward-Leonard set which is controlled by a load torque signal obtained by sensing the armature current of a motor, magnetic flux in the motor field winding and the rate of change of motor speed. The torque signal co

A crane motor control is disclosed which includes a variable D.C. voltage supply in a Ward-Leonard set which is controlled by a load torque signal obtained by sensing the armature current of a motor, magnetic flux in the motor field winding and the rate of change of motor speed. The torque signal controls the variable D.C. voltage supply to keep the motor armature current or the motor field current at a preset constant value upon completion of motor acceleration.

대표청구항 ▼

A constant power control for a D.C. electric motor comprising a Ward-Leonard set including a variable D.C. voltage supply and a D.C. motor connected thereto comprising: means for sensing the armature current of the motor, means for sensing the magnetic flux in the motor field winding, means for sens

A constant power control for a D.C. electric motor comprising a Ward-Leonard set including a variable D.C. voltage supply and a D.C. motor connected thereto comprising: means for sensing the armature current of the motor, means for sensing the magnetic flux in the motor field winding, means for sensing the rate of change of motor speed, means for generating a load torque signal in accordance with the armature current of the motor, a magnetic flux in the motor field winding and the rate of change of motor speed, means connecting the load torque signal to the variable D.C. voltage supply to control the variable D.C. voltage supply to maintain the motor armature current or the motor field current at a preset constant value upon completion of motor acceleration.