Motor speed control circuit

Details Motor speed control circuit Motor speed control circuit

2006-08-29

2008-09-02

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C327S077000, C327S087000

Reexamination Certificate

active

07420340

ABSTRACT:
A motor speed control circuit which controls a rotational speed of a motor by controlling an amount of current flowing through a drive coil of the motor. The control circuit comprises a reference voltage circuit that generates a reference voltage corresponding to a speed-specifying signal inputted to specify the rotational speed of the motor; a clamp circuit that limits a level of the reference voltage generated by the reference voltage circuit; a comparator that has a speed voltage corresponding to an actual rotational speed of the motor and the reference voltage limited in level by the clamp circuit applied thereto and compares the two; and a control signal generator that generates and outputs a control signal for controlling the amount of current flowing through the drive coil based on the comparing result of the comparator.

REFERENCES:
patent: 7098799 (2006-08-01), Imai et al.
patent: 7106107 (2006-09-01), Bhattacharya et al.
patent: 2003-204692 (2003-07-01), None

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