Geared motor

Details Geared motor Geared motor

2006-02-27

2008-05-20

Duda, Rina (Department: 2837)

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

C318S603000, C318S652000

Reexamination Certificate

active

07375487

ABSTRACT:
A motor encoder is mounted on a motor shaft of a geared motor1, and the origin position is detected by using a Z-phase signal. An absolute value encoder with a precision that allows the number of motor rotations to be determined is mounted on an output shaft4of a reduction gear, and the absolute rotational position thereof is detected. When the first Z-phase signal generated in conjunction with the rotation of the motor shaft2ais obtained at startup and at other times, the mechanical starting point at which the motor shaft and output shaft are both positioned at the origin can be calculated based on the absolute rotational position of the reduction-gear output shaft obtained from the output-side absolute value encoder. Since the mechanical starting point is obtained by rotating the motor shaft a single rotation at most, the time required to calculate the mechanical starting point is short in comparison with conventional examples, and extraneous rotational movements can be avoided.

REFERENCES:
patent: 4312033 (1982-01-01), Sweeney et al.
patent: 5187724 (1993-02-01), Hibino et al.
patent: 6917034 (2005-07-01), Iino et al.
patent: 2003/0079330 (2003-05-01), Stopher et al.

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