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OPERATING PRINCIPLES OF FREQUENCY GENERATOR SERVO MOTOR (FIG. 19)
The frequency generator is a new feedback control system which
keeps the motor constant against any power fluctuations, reduc¬
ing the amount of wow and flutter to excellent levels. The fre¬
quency generator servo-controlled circuits incorporate a high
performance 1C which is equivalent to 23 transistors. The motor
is equipped with frequency detection coils which automatically
cause the frequencies to be converted to the DC voltage which is
in proportion to the actual rotation of the motor.
This voltage
is electronically compared with the
reference
control voltage. The output of the comparator is the actual motor
control voltage which will adjust the motor speed based on the
signal supplied from the frequency generator. (Fig. 19)
■ ELECTRONIC SPEED SWITCHING BY FREQUENCY GENERATOR
Not only ensures light maneuverability but also prevents perfor
mance deterioration, unlike mechanical switching of the conven
tional belt-drive turntables (using a mechanical-type capstan).
■ LOAD CHARACTERISTICS (Fig. 20)
This chart indicates the fluctuation of the rotational speed of the
turntable in relation to the stylus pressure.
This unit employs a DC motor with a
FREQUENCY GENERA¬
TOR SERVO circuit so that the load characteristics are extreme¬
ly good.
Load characteristics
Stylus pressure (g)
0
2
4
6
8
10
Fig. 20
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