PASCO SE-8657 MOTOR ACCESSORY - Manual (Page 28)

24
Motor Accessory 012-06247A
¨
armature change when you change the voltage?
➤ Note: with the PASCO 6500 Series Power Amplifier, the motor may stop and
need to be restarted manually.
➉ Return the voltage to 8 volts and change the frequency of the alternating current to 20 Hz,
and then 24 Hz, determining the rotational speed each time. (Manually restart the motor
each time if needed.)
Does the rotational speed of the armature change when you change the current frequency?
11 If the room is lit with fluorescent lights, you can also see the effect changing the current
frequency on the motor’s speed. Fluorescent lamps flash twice during each cycle of the AC
power that supplies them. When the motor operates at a submultiple of this rate, multiple
images will appear to be stationary, so the armature will appear to be not moving. Observe
the armature at current frequencies of 15, 20, 24, and 30 Hz (or at 16.67, 20, and 25 Hz in
locations with 50 Hz AC power).