System and method for controlling the speed of an electric motor

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...

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Details

388904, 388906, 3889075, 388930, 318599, 318602, 318609, H02P 517

Patent

active

053254600

ABSTRACT:
A system and method for controlling the speed of a motor operating in an extremely low speed range and having a rotary pulse encoder which outputs a pulse whenever a rotation axle of the motor has rotated through a predetermined angle. The extremely low speed range is defined such that its pulse interval of the output pulses is longer than a speed control period of the system are disclosed, load torque estimated value observer is provided. The least order disturbance observer includes a first calculating block which calculates an estimated value of the motor speed n.sub.M ' (j) of a motor model on the basis of a torque command and a load torque estimated value: a second calculating block which calculates an average value of the motor speed at each pulse interval n.sub.M ' (j).

REFERENCES:
patent: 4680518 (1987-07-01), Kurakake et al.
patent: 4740885 (1988-04-01), Gose et al.
patent: 4851754 (1989-07-01), Sakamoto et al.
patent: 4862343 (1989-08-01), Nomura et al.
patent: 4885520 (1989-12-01), Sugimoto et al.

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