Motor speed adjusting apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsRyo Akiyama, Yoshiaki Igarashi
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Abstract
A motor speed adjusting apparatus comprising a motor, a motor speed setting device such as an up-down counter, a programmable divider the divisor of which is programmed by the motor speed setting device, a reference signal generator, a phase comparator which generates a d.c. voltage corresponding to the phase difference between the reference frequency signal and the output signal of the programmable divider, and a voltage controlled oscillator which oscillates at a frequency corresponding to the output of the phase comparator. The motor speed is adjusted according to the output frequency of the oscillator by step deviation from the standard motor speed, and further that deviation is displayed by a display device controlled by the motor speed setting device.
Claims9
A motor speed adjusting apparatus comprising:
- a motor speed setting means for generating a motor speed setting signal;
- a programmable divider connected to said motor speed setting means, having an input and an output, for generating a division signal having a frequency which is the frequency of the signal applied to said input divided by an integral divisor, said divisor corresonding to said motor speed setting signal;
- a reference signal generating means for generating a reference signal having a constant frequency;
- a phase comparator connected to said programmable divider and said reference signal generating means for generating a d.c. signal corresponding to the phase difference between said division signal and said reference signal;
- a voltage controlled oscillator connected to said phase comparator for generating an output signal having a frequency corresponding to said d.c. signal of said phase comparator, said output signal being applied to said input of said programmable divider and said output signal for application to a frequency controlled motor for control of the speed of the frequency controlled motor by the frequency thereof;
- and
- a display means connected to said motor speed setting means for displaying an indication of said motor speed setting signal, whereby said divisor of said programmable divider is stepwise changeable by said motor speed setting signal from a standard number N (N being an integer) which corresponds to a nominal motor speed and said display means displays the rate of deviation of said divisor from said standard number N.
A motor speed adjusting apparatus according to claim 10, wherein said apparatus further comprises a divider connected between said voltage controlled oscillator and said frequency controlled motor for generating an output signal having a frequency which is a predetermined division of the frequency of said output signal of said voltage controlled oscillator.
Dependencies are inferred from the claim text.