SPEED DETECTING DEVICE
Document Type and Number:
WIPO Patent Application WO/1982/003692
A speed detecting device which has a detector (101) for generating 2-phase sinusoidal signals (PA, PB) having frequencies which are proportional to the rotating speeds of motors, said signals also having phase displacement of (Alpha)/2 to produce, with the sinusoidal signals (PA, PB), voltages (VL, VH) which will vary with the rotation speeds of the motor thereby detecting the speeds. This speed detecting device has a quadruple circuit (107) and a frequency-to-voltage converter (107), and further a first speed generator for generating the voltage (VH) representing the actual speed in a high speed range, a 4-phase rectangular wave-signal generating circuit (106), a differentiating circuit (109), and a synchronous rectifying circuit (110), a second speed generator for generating a voltage representing the actual speed (VL) in a low speed range, thereby generating the voltages (VH, VL) in response to the high or low speed rotation.
Ishida, Hiroshi Fujioka Yoshiki Ota Naoto
October 28, 1982
April 22, 1982
FANUC LTD ISHIDA HIROSHI FUJIOKA YOSHIKI OTA NAOTO.
G01P3/42; G01P3/46; G01P3/48; G01P13/04; H02P29/00; (IPC1-7): G01P3/46