Title:
SPEED DETECTING DEVICE
Document Type and Number:
WIPO Patent Application WO/1982/003692
Kind Code:
A1
Abstract:
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.
Inventors:
Ishida, Hiroshi Fujioka Yoshiki Ota Naoto
Application Number:
PCT/JP1982/000136
Publication Date:
October 28, 1982
Filing Date:
April 22, 1982
Export Citation:
Assignee:
FANUC LTD ISHIDA HIROSHI FUJIOKA YOSHIKI OTA NAOTO.
International Classes:
G01P3/42; G01P3/46; G01P3/48; G01P13/04; H02P29/00; (IPC1-7): G01P3/46