Method and relative circuit for detecting a torque variation...

Details Method and relative circuit for detecting a torque variation... Method and relative circuit for detecting a torque variation...

2005-03-08

2005-03-08

Masih, Karen (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S432000, C318S433000

Reexamination Certificate

active

06864654

ABSTRACT:
The method detects variations of the torque of a DC motor and is particularly suited for detecting an accidental block of the motor operation. The method includes generating a first signal representing the current flowing in the motor, multiplying the first signal with a pre-established function producing a product signal, generating a comparison signal to correspond to the slope of the product signal and signaling a torque variation if the comparison signal surpasses a certain threshold. The method is implemented by a control circuit for detecting a torque variation of an electric DC motor, including a sensor for the current flowing in the motor, and generating a first signal, a first circuit for generating a product signal of the first signal by a pre-established function, a second circuit for generating a comparison signal to correspond to the slope of the product signal, and a comparator of the comparison signal with a certain threshold, signaling a torque variation when the comparison signal surpasses the threshold.

REFERENCES:
patent: 5977732 (1999-11-01), Matsumoto
patent: 20030009262 (2003-01-01), Colangelo et al.
patent: 20030030950 (2003-02-01), Bruno
patent: 2237658 (1991-05-01), None

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