SOI/DT 2006-01 dmm 44/71 599 37 47-135.8.2.1 Control of the speed of the motor Speed control is obtained by using an electronic control system to vary the voltage (V) applied to themotor. The technique used consists of a "phase division" performed by the Triac. A Triac is a bi-directionalelectronic switch. Closure of the circuit between A1 and A2 (anodes) takes place in the presence of theappropriate signals received by the gate (G).5.8.2.2 Direction of motor rotationThe direction of rotation of the motor depends on the way in which the rotor and stator are connectedtogether. This connection is performed by two of the timer contacts or by the relays on the PCB.Clockwise rotation Counter-clockwise rotationEC Electronic controlsystemP Motor overloadcut-outS StatorM RotorT TachometricgeneratorTY TriacR1,2 Reversal relayStart-up signalsVoltage to motor
