Data for verification
- Nominal voltage, V — 12
- Nominal power, W — 20
- Rotational speed of the anchor shaft with impeller at rated power, min⁻¹ — 3000±150
- Current consumption at rated power, no more than, A — 4.5
- Low rotation speed of the anchor with impeller, min⁻¹ — 2200±150
- Current consumption at anchor rotation frequency of 2200 min⁻¹, no more than, A — 2.7
The electric motor ME-255 is a direct current motor with excitation from permanent magnets. The electric motor connection diagram is shown in Fig. 7-36.
Fig. 7-36. Wiring diagram of the heater electric motor: 1 - heater electric motor; 2 - additional resistor; 3 - heater switch; 4 - fuse box; 5 - ignition switch; 6 - generator; 7 - battery
When an additional resistor 2 is included in the electric motor power supply circuit, the armature shaft rotates at a reduced frequency.
The resistor is secured with two spring washers in the heater fan casing. The resistor resistance value is 1.5 ohms at 20°C.
A faulty electric motor is usually recommended to be replaced. The only possible repair is cleaning the collector.
To disassemble the electric motor, unscrew the cover fastening screws 6 (Fig. 7-37) and remove it. Then remove the lock washer 1 from the armature shaft and remove the armature 4 from the housing.
Fig. 7-37. Heater electric motor parts: 1 - lock washer; 2 - washer; 3 - body; 4 - anchor; 5 - cracker; 6 - lid
Assembly is carried out in the reverse order. The technical condition check is similar to that described above for the windshield wiper motor.