Does the DC motor allow low-speed operation?

Does the DC motor allow low-speed operation?

Answer: Low speed operation of DC motors will increase temperature rise and have many adverse effects on the motor. But if effective measures are taken to improve the heat dissipation capacity of the motor, it can operate for a long time without exceeding the rated temperature rise.

What are the functions of the motor comprehensive protector?

Answer: The comprehensive protection of electric motors generally has the following functions: (1) quick break protection; (2) Overcurrent protection; (3) Overload protection; (4) Negative sequence current protection; (5) Zero sequence current protection; (6) Thermal overload protection

Cage asynchronous motor? What are the advantages and disadvantages of full pressure starting?

Answer: The advantages are: simple method, few starting devices, and high starting torque. The disadvantages are: high starting current, large impact torque on the machinery, and significant voltage drop during starting.

What data is marked on the nameplate of an asynchronous motor? What does each mean?

Answer: The nameplate of the asynchronous motor is mainly marked with the following data, and its meaning is explained as follows:

(1) Rated power (P): It is the output power on the motor shaft.

(2) Rated voltage: refers to the line voltage applied to the winding.

(3) Rated current: current of stator winding wire.

(4) Rated speed (r/min): The number of revolutions at rated load.

(5) Temperature rise: refers to the insulation level being able to withstand temperatures exceeding the ambient temperature? Warm propagation increases in value.

(6) Work quota: refers to the allowed operating mode of the electric motor.

(7) Winding connection method: Δ or Y connection, corresponding to the rated voltage.

What are the consequences of overloading the electric motor?

Answer: Overloading of the electric motor will disrupt the electromagnetic balance relationship, causing a decrease in motor speed and an increase in temperature. If short-term overload can still maintain operation, if long-term overload exceeds the rated current of the motor, it will cause insulation overheating, accelerate aging, and even burn out the motor.