The single-phase totally enclosed compressor has three terminals outside the casing, and some of the inlet units are marked with R(M), S, and C marks, as shown in Figure 5-8.
R(M)-C: Main coil or running coil, the wire diameter is thicker, the internal resistance is smaller, and the current is larger.
SC: Starting coil, the wire diameter is fine, the internal resistance is large, and the current is small.
C: Common point.
R(M)-S: The main coil is connected in series with the coil, the resistance is the largest, and the current is the smallest.
Identification method: Use a multimeter to measure the resistance value of three terminals, and select the range of the meter in Ω×1 to zero. Use two test pens to measure the ohmic value of any two points of the three-wire head and record them, and finally get three different resistance values. The order of resistance is RC Table 5-2 Overload protector technical parameters Compressed Power Thermal Protector Disconnected Temperature Closed Temperature Disconnected Current (A) Disconnected Current (A) (W) Model (°C) (°C) at 90°C at 25°C 62MRP410HX3091120±578±94.71-1.3 93MRP419HR3091135±592±94.21.1-1.35 93MRA98827-9011105615.31.75 (70 ° C) 125MRP379HX3091120±578±95.51.3-1.57 150MRP345HX3091120±578±96.71.35-1.85 150MRP60AMN3091120±569±98.82.9-3.65 (70°C) 187MRP6IHK3091120±561±97.51.8-2.3 (70°C) 150MRP40AMX3091120±578±9102.5-3.5 LYDP76150±1080±103.60.96-1.32 (100°C) LYDP96150±1080±103.40.8-1.18 (100°C) LYDP79150±1080±104.71.15-1.56 (100°C) LYDP97150±1080±103.81.0-1.35 (100°C) LYDP33150±1080±10112.45-3.40 (100°C) Figure 5-8 Internal and external wiring of the fully enclosed compressor Motor performance requirements. The compressor is the heart of the refrigeration equipment. The electric motor provides the motive force for the compressor, converts the electric energy into mechanical energy, and drives the compressor to realize the refrigeration cycle. The electric motor used in refrigerators and air conditioners is sealed in a casing together with the compressor, and operates at a certain vapor pressure and high temperature for a long period of time. Therefore, there are special requirements for the performance of the electric motor. (1) The motor must have good chemical stability under long-term immersion of refrigerant and refrigeration oil. The insulation material of the motor is required to maintain reliable insulation performance under high temperature and high pressure, and has good resistance to refrigerant and refrigeration oil. (2) The motor is often started under full load or overload. It requires a large starting torque, can operate normally under overload, and can adapt to a certain range of voltage fluctuations and frequent starting requirements. (3) In order to improve the refrigeration capacity of the equipment, the motor is required to have higher efficiency. (4) The motor enclosed in the steel shell of the compressor has a working environment temperature of more than 70 °C, and the temperature rise during operation can reach about 100-120 °C. It is required that the winding coil and the insulating material of the motor have high temperature resistance and aging resistance. (5) The motor is susceptible to electromagnetic force shock caused by the starting current, the impact of the refrigerant into the casing, the thermal shock of rapid evaporation, and the mechanical vibration during starting and stopping; the electromagnetic coil of the motor is required to have a certain mechanical strength and can withstand Vibration and impact resistance. 
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