Semiconductive power unit for variable speed drive motor

Details Semiconductive power unit for variable speed drive motor Semiconductive power unit for variable speed drive motor

1994-10-28

1996-11-05

Ip, Paul

Electricity: motive power systems

Limitation of motor load, current, torque or force

318139, 318257, 318493, H02P 516, H02P 506

Patent

active

055721001

ABSTRACT:
A semiconductive power unit for controlling drive motor speed by controlling the power applied to the motor through a variable or switchable semiconductive control element, such as a Darlington transistor. Electrical power is supplied from a power supply to the variable speed drive motor via the controllable semiconductive device connected to provide a variable impedance branch path between the power supply and the variable speed drive motor. A power dissipation characteristic for the variable impedance branch path is established, wherein current flow therethrough decreases monotonically with increasing voltage across the variable impedance branch path. The circuit establishing the characteristic also provides a feedback signal to the controllable semiconductive device to maintain its operation at the established power dissipation characteristic. The method involves determining a maximum permissible power dissipation for the impedance of the controllable semiconductive device, establishing a power dissipation limit characteristic including the step of calculating the constants A, B, and C for the relationship

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