Technics SL-1500C Manual page 6

Coreless Direct Drive Motor
Platter shape optimised by simulation
High Accuracy Motor Control
In the direct drive system, the motor is connected directly to the platter so that the
motor rotation speed becomes the rotation speed of the phono record. Therefore, it is
extremely important to control the drive motor's rotation speed to ensure stability.
The SL‐1500C utilises the latest motor control technology refined through the
development of Blu‐ray disc products. Furthermore, the FG coil pattern of the full‐
circumference detection FG system was improved in precision to achieve more
detailed measurement of platter rotation speed.
Accurate sine wave output by the microcomputer is used as the control waveform for
constant rotation speed operation. This sine wave is smoother than the simplified
sine wave generated by the external coil used in the SL‐1200MK5, thus ensuring
accurate motor control. The SL‐1500C also utilises the newest motor control
technology refined through the development of Blu‐ray disc products. Furthermore, it
incorporates technologies used in high‐end models to correct variations of
characteristics in the parts of the motor drive circuit and magnetic circuit.
SL‐1200mk7/SL‐1500C
SL‐1200mk5
Technical Information for Hi‐Fi Audio System
6