54
Motor
Definition of the motor:
The AeroSmart™ motor is a 250W four
pole three-phase motor with a cast
aluminium end shield construction.
It has the same torque in forward and
reverse rotations.
What does the motor do?
It powers the fan and rotates the drum
(via the drive-belt).
How is our motor different?
The AeroSmart™ dryer has a three-phase motor. It varies the speed by changing the
frequency of the motor current (AC). It doesn’t have to use the drum speed feedback at
door opening and closing speed. We only need to use a simple belt tensioner assembly
to connect the motor to the drum.
The motor drives both the fan and the drum. At one end of the motor is a fan and at
the other end is a pulley. A rubber belt sits around the pulley and the other end wraps
around the drum (refer to Airflow for a diagram page 51) The motor acts as a drive
system between the two. When the drum rotates at 47 rpm the fan is spinning at 2300
rpm.
Conventional single-phase motors require a capacitor to start. This supplies the phase
difference to drive the motor. AeroSmart’s three-phase motor creates different
frequencies with the electronics. The speed isn’t determined by the frequency of the
power supply, so we can drive it at any speed we want.
Drum Speed During Tumble 47 rpm
Motor Speed During Tumble 2300 rpm
Motor Power During Tumble 250 V Electric, 120 V Gas
Motor Torque at Tumble Speed 1.0 Nm
Motor Torque at Door Closing Speed 1.8 Nm
Airflow with Average Exhaust Duct Restriction 230 CMF (60 l/s)
Temperature Rise of Motor 122˚F (50˚C)
Drum Inlet Temperature (max) 329˚F (165˚C)
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