1. Motor

*Generally, 380V motors are used for motors below 250KW, and 6kV and 10kV motors are generally used for motors above 250KW.

*The explosion-proof air compressor is 380V / 660V. The wiring mode of the same motor is different, and the two voltages of 380V and 660V can be selected. The high pressure marked on the nameplate of the explosion-proof machine is 0.7MPa, and the national standard of 0.8MPa is not available. The production license issued by the state indicates 0.7MPa, which can reach 0.8MPa in actual use.

*The air compressor is equipped with 2-pole and 4-pole asynchronous motors.

*The speed of 2-pole synchronous motor is 3000r / min, and the speed of 2-pole asynchronous motor of air compressor is ≥ 3000 × 97% = 2910 R / min, generally 2960 R / min for users, and 3% is the speed difference.

*The speed of 4-pole synchronous motor is 1500r / min, and the speed of 4-pole asynchronous motor of air compressor is ≥ 1500 × 97% = 1455 R / min, generally 1480 R / min for users, and 3% is speed difference.

*There are only 2-pole and 4-pole motors matched with the air compressor, and the rotation speed can be regarded as a constant (1480 R / min and 2960 R / min) according to the national standard.

*Service coefficient: all motors in the air compressor industry are non-standard motors, which is a status quo of large machines and small standards. The service coefficient is generally 1.1-1.2. For example, the service factor of the motor of the 200kW air compressor is 1.15, so the high power of the motor of the air compressor can actually reach 200 × 1.15 = 230kw, 15% of the power is reserved when telling the user, which belongs to additive feeding.

*Ordinary motor is a status quo of small machine and large standard. For example, it is good that a 100kW motor can output 80% of the power. The common saying is that the power factor cos ∮ = 0.8, which is cheating.

*Protection grade: refers to the waterproof and dust-proof grade of the motor. Generally, IP23 is enough. However, in the air compressor industry, 380V motors are basically IP55 and IP54, 6kV and 10kV motors are basically IP23, and some customers require IP55 or IP54.

*Insulation level: refers to the ability level of the motor to resist high temperature and burn. Generally, level F is used, and level B temperature rise assessment refers to the standard assessment one level higher than level F.

*Startup mode: startup mode of star triangle conversion.