ADL 2010 / 01 27/57 599 72 63-27
7.6 MOTOR UNIT
1. Fan
2. Motor
3. Belt tensioner
It is possible to get an idea of the efficiency of the motor by measuring the resistance of the coils:
PIN 1-3 PIN 2-3
Resistance 22 Ω / 26.2 Ω ± 7% 20.8 Ω / 26.2 Ω ±7%
General characteristics:
The motor unit is made up of a belt tensioner (3), a fan (1 which sucks the air from the inside of the
appliance and forces it towards the outlets) and the single-phase induction motor with thermal cutout.
Single-phase induction motors are characterised by a lack of torque on initial start-up, and this is obtained
by adding a coil crossed by a current that is 90° out of phase with respect to the main one. This phase
offset is obtained by means of a capacitor serial connected to the coil.
The motor used in tumble dryers has the stator made up of two identical coils, the 90° current offset is
determined by the condenser (C) which is conneccted in series first to one coil and then to the other (to
determine rotation in one direction or in the opposite direction). This change in connections is determined
by the circuit board.
To Next Page
Loading...
