Device for controlling the reverse rotation of a motor and metho

Details Device for controlling the reverse rotation of a motor and metho Device for controlling the reverse rotation of a motor and metho

1993-06-14

1995-08-15

Ip, Paul

Electricity: motive power systems

Motor-reversing

318281, 318282, H02K 2720

Patent

active

054422671

ABSTRACT:
In a device for controlling the reverse rotation of a motor, output pulses of a detector connected to an axis of rotation of a motor are counted for each very small unit time period .DELTA.t after a reverse rotation instruction is applied to the motor, and the speed N and the acceleration .alpha. of the motor are calculated for each very small unit time period .DELTA.t. It is judged that the motor begins to rotate in the reverse direction at the time point where the acceleration .alpha. is switched from the negative to the positive after the calculated speed N of the motor is not more than a predetermined reference speed Nth. In addition, when it is not judged that the motor is rotated in the reverse direction within a predetermined time period after a reverse rotation instruction is applied to the motor, it is judged that an abnormality occurs in the control device, so that the motor is stopped.

REFERENCES:
patent: 3924721 (1975-12-01), Reynolds
patent: 4367435 (1983-01-01), Bailey et al.
patent: 4542633 (1985-09-01), Hirooka et al.
patent: 4629949 (1986-12-01), Senso
patent: 4670694 (1987-06-01), Asai
patent: 4857814 (1989-08-01), Duncan
patent: 4897882 (1990-01-01), Pickering
patent: 4939440 (1990-07-01), Burke
patent: 5323097 (1994-06-01), Kiiski
Patent Abstracts of Japan, vol. 9, No. 27 (E-294) 6 Feb. 1985 & JP-A-59 172 993 (Hitachi Seisakusho KK) 29 Sep. 1984.

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