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2.1.14 Motor and Brake
The motor is a high-torque motor that increases
the disk speed quickly. The disk speed during
start and stop operation is important only because'
the time that the data heads touch the rotating
disk must be limited.
The motor has a manual thermal reset. A motor
tension spring pivots the motor to keep tension
on the drive belt. There is also a motor antistatic
brush located on the brake assembly.
The brake is activated when the power goes off.
When current stops flowing through the brake coil
assembly, a spring-loaded pad is released that
engages the brakeplate and stops the motor.
There are two motor styles; the new style motor
has a capacitor on the top, a motor start relay on
the bottom, and is smaller than the old style.
Start
Capacitor
Manual
Thermal
Reset
Motor
Antistatic
Brush
Motor Start Relay
(cover removed)
Motor
Tension
Spring
Front View (old style motor)
Front View (new style motor)
Disk Drive
2-5
TNL: SN31-0487 to SY31-0373-4 (25 Nov 77)
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