Universal Motor (Ewm 21Xx); Power Supply To Motor; Three-Phase Asynchronous Motor (Ewm25Xx) - Electrolux EWM21xx Service Manual

10.9 Universal motor (EWM 21xx)

11 Tachometric generator
12 Stator
13 Protector
14 Rotor
20 PCB

10.9.1 Power supply to motor

The PCB powers the motor via a triac. The direction of rotation is reversed by switching of the contacts on the
two relays (K2-K3), which modify the connection between the rotor and the stator.
In certain models, a third relay (K4) is used to power the stator (full or half field) according to the spin speed.
The speed of rotation of the motor is determined by the signal received from the tachometric generator.
During the spin phases, the microprocessor performs the anti-foam and the anti-unbalancing control procedure.

10.10 Three-phase asynchronous motor (EWM25xx)

11. Tachometric generator
20. PCB
23. Inverter
24. Motor
X-Y-X = Motor windings
10.10.1 Power supply to motor
Three-phase power is fed by the inverter (4) which sends, through the connectors 5-6-7, the three phases to
connectors 1-2-3 on the motor (nodes V-W-U), where the windings (Y-X-Z-) are connected. The phase shift
between the phases is 120° and peak amplitude is 310V.
The condition of the motor can be determined by
measuring the resistance of the windings:
∼
Winding y ohm 5,4 ±7% (contacts 2-3)
∼
Winding x ohm 5,4 ±7% (contacts 1-2)
∼
Winding z ohm 5,4 ±7% (contacts 1-3)
Winding T (tachometric) ohm 121
The electrical components must be serviced by qualified personnel only.
Unplug the appliance before accessing internal components.
SOI/DT 2007-11 dmm
∼
±7% (contacts 4-5)
47/69
599 70 39-88