Circuit configuration for permanent magnet synchronous motor...

Details Circuit configuration for permanent magnet synchronous motor... Circuit configuration for permanent magnet synchronous motor...

2005-05-17

2005-05-17

Duda, Rina (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S132000, C318S434000, C318S459000, C318S500000, C318S609000, C318S610000

Reexamination Certificate

active

06894450

ABSTRACT:
Circuits and methods for use with an integrated circuit chip having internal back EMF estimation to control a permanent magnet synchronous motor includes an AC current feedback circuit, a scaling circuit, and a current regulator. Additionally, a speed regulator may be employed. In one embodiment, during operation at very low speed, the speed regulator is in an open loop control mode due to a back EMF detection limitation of the IC chip, and only the current regulator is active. A feedback current signal, together with a user-defined command current signal, serves the input of the current regulator, which controls the AC motor current and drives the motor speed from standstill. Once the motor speed reaches a certain level, the measured back EMF from the IC chip is sufficient to estimate the motor speed, which is compared with a user-defined command speed, and an error of the these two signals provides the input of a speed regulator.

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Micro Linear Corp., “ML4425/ML4426—Sensorless BLDC PWM Motor Controller,” Technical Specifications, May 1997.

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