Motor encoder

Details Motor encoder Motor encoder

2007-03-27

2007-03-27

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C324S207250

Reexamination Certificate

active

10904673

ABSTRACT:
An encoder mounted on a motor axle of an AC servomotor has a single bipolarly magnetized rotational disk, magnetic sensors for outputting X- and Y-signals that differ in phase by 90° in association with the rotation thereof, and a signal processing unit. The signal processing unit computes at predetermined cycles a rotor angle θa of a motor rotor on the basis of the X- and Y-phase signals, generates three-phase magnetic pole signals U, V, and W that differ in phase by 120° on the basis of the number M of magnetic poles of a motor, a magnetic pole reference angle θo, and the rotor angle θa; and generates A- and B-phase signals with predetermined pulse cycles that differ in phase by 90° on the basis of the rotor angle θa. An encoder that is advantageous for reducing the size and weight of an AC servomotor can be realized because it is sufficient to provide a single assembly composed of a rotational disk and magnetic sensors.

REFERENCES:
patent: 4982146 (1991-01-01), Moteki
patent: 5155401 (1992-10-01), Kanaya et al.
patent: 6552453 (2003-04-01), Ohiwa et al.

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