Brushless DC motor

Electricity: motive power systems – Switched reluctance motor commutation control

Patent

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Details

Other Related Categories

318138, 318439, H02K 2902

Type

Patent

Status

active

Patent number

044726660

Description

ABSTRACT:
A brushless DC motor, in which power supplied to polyphase stator coils is controlled by drive transistors, has a DC-DC switching converter for producing an output voltage according to an on-time ratio of the switching semiconductor, a voltage controller for detecting a voltage drops across the drive transistors and for controlling the on-time ratio of the switching semiconductor so that the voltage drops across the drive transistors become a predetermined small value, a temperature detector for detecting a temperature of the drive transistors, and a current reviser for reducing the output currents of the drive transistors in each activated period so that the currents of the drive transistors are controlled in response to a command signal and an output of the temperature detector.

REFERENCES:
patent: 3896357 (1975-07-01), Tanikoshi
patent: 4023082 (1977-05-01), Tanikoshi
patent: 4039911 (1977-08-01), Tanikoshi
patent: 4051420 (1977-09-01), Tanikoshi

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