9904 111 31813 ALLIED MOTION PREMOTEC, 9904 111 31813 Datasheet - Page 2

• Manufacturer Part Number: 9904 111 31813
• Description: MOTOR, TURNTABLE
• Manufacturer: ALLIED MOTION PREMOTEC

Specifications of 9904 111 31813

• Input Power: 1.8W
• Rotation Direction: Reversible
• Operating Temperature Range: -5°C To +70°C
• Current Rating: 18mA
• External Depth: 23.9mm
• External Diameter: 51mm
• Fixing Centres: 60.2mm
• Fixing Hole Diameter: 3.7mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Record deck Motor installation
Mechanical installation
Although
installation there are a number of methods to
obtain optimum low vibration that will depend
on the design of the record deck. Although
the motor has been specifically designed to
generate low vibration, as a general guide it is
recommended that it is mounted to the motor
board via an anti-vibration pad as shown.
Since the pulley design of some record decks
impose a vertical force on the motor shaft the
motor shaft is not preloaded axially within the
motor. In some installations it will be
necessary to apply a a slight pre-load to the
shaft so that it runs in the fully ‘up’ position.
This is best achieved by means of a rubber
strap and a small cup that holds the shaft in
the fully up position as shown
Electrical installation of motor
Reducing motor vibration by means of additional trim circuit
The optimum torque provided by the motor should only be sufficient to accelerate the platter to synchronous speed,
since the lower the motor torque is during fixed speed operation, the lower the vibration inducing torque ripple will be.
For a given installation it may be possible to increase the value of the series resistor ( nominally 6.8 Ohms ) in the basic
circuit to optimise motor performance while a lower value of the phasing capacitor ( nominally 0.22 F ) may prove
beneficial. For optimum results trimmers may be added in series with each motor coil to electrically balance the motor.
Mclennan Servo Supplies Ltd
Basic connections
220 Vac 50 Hz: C= 0.22 F speed = 250 rpm
2.5W
6.8K
the
diagram
GREY
CW rotation
RED
shows
BLUE
GREY
.
a
Tel: [phone] www.mclennan.co.uk
typical
Connections for reduced vibration
2.5W
6.8K
Platter
Rear shaft support
GREY
RED
BLUE
GREY
Coil balance
trimmers