8.10.5 Motor with speed variator On certain models, spin speeds from 600 to 800 rpm can be obtained using a motor fitted with a speed variator (the speed during the washing phase is always 55 rpm). 1. Motor 2. Speed variator The motor pulley consists of two disks: the first is attached to the motor drive shaft, while the second can move axially. At high speeds, the increased rate of rotation of the shaft (two-pole winding), and the consequent thrust exerted by the centrifugal mass, causes the moving disk to change position. As a consequence, the diameter of the pulley is modified, and the transmission ratio between the motor pulley and the drum pulley is altered.
The drum will therefore rotate at 600 rpm with the 2/12 motor, or 800 rpm with the 2/16 motor. 1. Moving disk 2. Fixed disk 3. Drive belt 4. Centrifugal mass 8.10.6 Checking for efficiency INOPERATIVE AT LOW SPEED : - measure the resistance of the windings. If correct, check the capacitor. INOPERATIVE AT HIGH SPEED: - measure the resistance of the windings. If correct, check the capacitor. INOPERATIVE AT HIGH SPEED AND LOW SPEED: - measure the resistance of the windings. If correct, check the capacitor. IRREGULAR OPERATION (motor overheating cut-out): - operate the appliance until the problem occurs, then measure the resistance of the windings. POWER LINE CUT-OUT INTERVENES:
- check whether any of the windings / components are connected to earth or inadequately earthed, using a tester with a minimum scale of 40 M Ω across each terminal and the casing (correct reading is ). NOISE (Bearings-Magnetics-Drive belt): - disconnect the drive belt to identify the source of the noise. Checking for efficiency of the motor capacitor DOES NOT START UP IN LOW SPEED AND HIGH SPEED OPERATION (noise): - use an ohmmeter (capacitance meter) to check that the capacitor is not faulty. OCCASIONALLY FAILS TO START UP AT HIGH SPEED (inadequate capacitance): - use an ohmmeter (capacitance meter) to measure the capacitance of the capacitor. THE MOTOR DOES NOT START:
- use an ohmmeter (capacitance meter) to check whether the capacitor is short-circuited. SOI/DT 2002-05 eb 77 599 35 23-17 Low speed High speed