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Air Conditioner Motor Enhancement Of Heat Transfer Effect By Forced Convection Through Air

Zhejiang Kening Motor Co.,Ltd | Updated: Oct 17, 2017

Air-conditioner motor is an important noise source of air-conditioning system, especially the indoor air conditioner, the electromagnetic noise frequency of the motor is low, the tone is close to the mono-frequency pure tone, the motor's working condition can be judged by the recognition of the noise of the air conditioner motor.

There are many methods to identify motor noise, and a practical load replacement method is introduced. There are many reasons for the electromagnetic noise of the air conditioner motor, and the characteristic frequencies are generally related to the power frequency. Simply using the simple load replacement method, you can distinguish the vibration caused by abnormal vibration or overload caused by uneven magnetic field. Taking an air-conditioner indoor fan as an example, the motor has a peak noise frequency of 600Hz. Because the frequency does not change with the speed of the motor, and the noise disappears as the power supply is cut off, it is determined to be the electromagnetic noise of the motor.

Electromagnetic noise is generally due to poor electromagnetic design, fixed, rotor looseness caused by abnormal electromagnetic vibration. In order to distinguish the source of electromagnetic sound, the method of replacing load is adopted.

The impact of air conditioning fan load is:

(1), wind leaf weight;

(2), the Center of the Wind Center load on the motor shaft position (for static, dynamic balance of good wind vane, its centre should fall on the geometric axis), that is, the length of the cantilever. After changing the same weight of the wind vane, in the same speed of the case, the motor 600Hz electromagnetic sound completely disappeared. The comparison found that the original center of gravity, far away from the front of the motor bearings, so that the motor shaft of the cantilever lengthened, motor rotation, causing the rotor eccentric increase.

(3), the fault of the motor is the main cause of the noise of the indoor air conditioner, in order to fully recognize the noise source of the motor, in addition to the conventional method to identify the characteristic frequency, the acoustic theory and other recognition methods should be combined with the less obvious fault of some characteristic frequencies.

Generally have the following law: ① for the same motor, the higher the rotational speed, the lower the characteristic frequency: ② Motor load too large (cantilever too long) will cause the motor electromagnetic noise, its vibration frequency may exceed 500Hz.

1. The parameters of the air conditioner motor

Rated voltage 12VDC of air-conditioner motor, phase number 4, deceleration ratio 1/85, step angle 7.5/85, Drive mode eight beat, DC resistance 130ω±7% (25 ℃), no-load Traction frequency 500hz, 800hz traction torque ≥800GF. cm (100hz); insulation resistance ≥100mω insulation dielectric strength 600vac/1ma/1s;

2. The function of the air conditioner motor

Air-conditioner motor is one of the important electrical parts in air-conditioning equipment. Air conditioning equipment commonly used in the role of the main motor: to drive the fan rotation, through the air forced convection to strengthen the heat transfer effect, strengthen the indoor cold/hot air flow, driving the wind pendulum to change the cold/hot air flow direction. For the new air, for central air-conditioning, the air-conditioning motor is also used to drive the pump.

3. The working principle of the air conditioner motor

The working process of the air conditioner motor is: When the phase winding is stimulated, the magnetic flux from the positive phase teeth, through the soft core of the rotor, and the shortest road strength to the negative phase teeth, while the other six of the convex teeth and no magnetic flux. In order to minimize the magnetic path, under the action of magnetic force, the rotor is forced to move, so that the nearest pair of teeth with the incentive of a relatively accurate.