Rotation speed detecting apparatus for a motor having an encoder

Details Rotation speed detecting apparatus for a motor having an encoder Rotation speed detecting apparatus for a motor having an encoder

1993-07-07

1994-11-22

Ip, Paul

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318803, 318685, H02P 540

Patent

active

053672410

ABSTRACT:
A rotation speed detecting apparatus for a motor includes a motor; an encoder section, attached to the motor, for producing at least two encoder pulse signals each 90 degrees out of phase from the other; a control and division number setting section for controlling the rotation direction and speed of the motor according to the loaded program, setting a division number and producing a division control signal according to the set division number; a quadrupled pulse signal producing section for producing an up/down pulse signal according to the forward and reverse rotation directions of the motor on a quadrupled pulse signal and an up/down pulse signal produced according to the state transitions in the encoder pulse signals; and, a frequency dividing section for counting up or down the quadrupled pulse signal and dividing the quadrupled pulse signal by the set division number.

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