Basic technical requirements for shaded pole motors

The rated index of the conventional shaded pole motor mainly includes the following items:

1) Voltage (V) refers to the power supply voltage to which the stator winding should be connected when the motor is running normally. The voltages used in various countries and regions in the world are very different, so the voltage specifications of the motor are also many, such as: 120V, 230V, 220V, 240V, 100V, etc. The allowable deviation of the power supply voltage is not less than ± 5%.

2) Frequency (Hz) is the frequency of the AC power supply. The frequency of China's power grid is set at 50 Hz, and some exported products are at 60 Hz. The frequency tolerance does not exceed ± 1%.

3) Power (W) refers to the mechanical output power of the rotating shaft of the motor during rated operation. For motors with small output power, for the convenience of users, it can also be expressed by output torque. Some motors are evaluated by the comprehensive index of the whole machine. At this time, the maximum input power is often used to reflect its power index. The power marked on the nameplate of our company's motor generally refers to the rated maximum input power.

4) Rotational speed (RPM) indicates the rotation speed of the motor running at the rated voltage, frequency and output power. Generally, the speed of the motor refers to the speed of the motor shaft. For some special products integrated with the gear system, it often means that the actual rotation speed of the output shaft after deceleration of the card gear. The speed of the shaded pole motor is lower than the frequency of the power supply. The synchronous speed is determined by the number of motor poles.

5) Current (A) refers to the input current of the stator winding when the motor is running under rated conditions, and can be used to check whether the motor is overloaded or faulty.

6) Efficiency (η) refers to the ratio of motor output power to input power during rated operation. Generally, after the motor reaches a thermally stable state, its output torque is directly measured with a dynamometer, and the rated speed is recorded, thereby calculating the output power, and the motor input power is directly read from the test instrument.

7) The insulation level represents the insulation level of the motor windings, which is used to determine the allowable temperature rise of the motor. Commonly used insulation levels are A, E, B, F and H. The corresponding limit working temperature is 105 ℃, 120 ℃, 130 ℃, 155 ℃ and 180 ℃.

8) Other indicators Some motors that have been specially designed or used are marked with relevant technical indicators on the nameplate, such as working mode (continuous, short-time, intermittent cycle operation), thermal protection form (impedance protection, one-time thermal insurance) Protection, etc.), power factor, starting current pole torque, overload multiple, etc.