Universal Motor - Electrolux EWX13611 Service Manual

Universal motor

11.8
11.8.1 General characteristics
Collector motors are fitted on appliances with a spin speed of between 600 and 1,600 rpm.
1. Stator
2. Terminal board
3. Collector
4. Tachometric generator magnet
5. Tachometric generator coil
6. Brush
11.8.2 Operating principle
The stator winding is connected in series to the rotor winding (serial excitation).
Every section of the rotor winding is connected to a pair of collector blades (also referred to as a switching
device). The electrical contact between the collector and the fixed circuit is made by two static brushes on the
collector blades.
The speed of rotation of the motor is proportional to the supply voltage, supplied by an electronic control.
This type of motor is also referred to as "universal" because it can be powered by either alternating or direct current.
11.8.2.1 Motor speed control
 This is achieved by an electronic control, by varying the voltage (V) applied to the motor.
 The method adopted is the "phase partialization" command of the TRIAC. The TRIAC is an electronic
bidirectional switch. Closing of the circuit between A1-A2 (anodes) occurs when there are appropriate
starting pulses on gate (G).
Starting pulses
Voltage on motor
Technical Support - MDM
0 V 110 V
50/104
180 V 230 V
599 77 39-16 Rev. 00