Title:
SPEED CONTROLLER FOR ELEVATOR
Document Type and Number:
Japanese Patent JPS5950789
Kind Code:
A
Abstract:
PURPOSE:To obtain an accurate speed signal over the entire speed range of a motor by counting the number of pulses while a motor is rotating at a high speed, measuring the interval of the pulses during the low speed rotation as a speed signal. CONSTITUTION:When an armature 3 rotates, a speed pulse 8a from a pulse generator 8 is outputted. A counter 12 counts the number of speed pulses 8a in a sampling period T1 indicated by a sampling pulse 24a, and outputs a speed signal 12a. A counter 14 counts the number of pulses 13a in the time T2 during the speed pulse 8a and outputs a speed signal 14a. A central processing unit 20 calculates a deviation signal between the speed command signal and the speed signal 12a when the armature 3 rotates at a high speed and a deviation signal between the speed command signal and the speed signal 14a when rotating at a low speed, and produces an output through a converter 23 to a phase control circuit 25.
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| JPS512889 | JIDOSEIGYOKEINO KANSHISOCHI |
Inventors:
TANAHASHI TOORU
Application Number:
JP16151682A
Publication Date:
March 23, 1984
Filing Date:
September 16, 1982
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H02P7/292; B66B1/28; B66B1/30; G01P3/489; H02P29/00; (IPC1-7): B66B1/28; H02P5/06; H02P5/16
Domestic Patent References:
| JPS53143378A | 1978-12-13 |
Attorney, Agent or Firm:
Masuo Oiwa