Motor control apparatus using speed and phase control in a first

Details Motor control apparatus using speed and phase control in a first Motor control apparatus using speed and phase control in a first

1994-04-12

1996-08-20

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 7304, 318606, G11B 1552, G05B 102

Patent

active

055484557

ABSTRACT:
In a motor control system, a first servo loop for a phase system and a second servo loop for a speed system are provided the pull-in operation of the motor during the transition time period is made stable, and also the operation efficiency of the low-speed CPU is not deteriorated. In the motor control system, the first servo loop is arranged by a speed detector for outputting a voltage corresponding to a frequency of a first reference signal used to set a rotational speed of the motor, a phase comparator for comparing a phase of the first reference signal with a phase of a control signal; and an adder for adding an output of the speed detector to an output of the phase comparator. The second servo block is arranged by a voltage-to-frequency converter for producing a second reference signal having a higher frequency than the frequency of the first reference signal, corresponding to a voltage signal outputted from the adder, and a phase servo block for comparing the second reference signal outputted from the voltage-to-frequency converter with a rotational speed signal of the motor, and for controlling the rotational speed of the motor based on the comparison result. Under such a circumstance, the output from the phase comparator is not applied to the adder until the motor starts its rotation and then the rotational speed thereof reaches a predetermined rotational speed.

REFERENCES:
patent: 4409628 (1983-10-01), Frimet et al.
patent: 4494154 (1985-01-01), Akiyama
patent: 4510535 (1985-04-01), Tokumitsu
patent: 4568986 (1986-02-01), Furuhata et al.
patent: 5144210 (1992-09-01), Sato
patent: 5204601 (1993-04-01), Hirata et al.
patent: 5304907 (1994-04-01), Abe et al.
patent: 5459622 (1995-10-01), Tajima et al.
Azuma et al., Microprocessor controlled variable play-back speed system for video tape recorder, Jan. 28, 1980, pp. 125-128.

Affiliated with

Also associated with

Rating

Motor control apparatus using speed and phase control in a first does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Motor control apparatus using speed and phase control in a first, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor control apparatus using speed and phase control in a first will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2334827