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Air Conditioner Motor Change The Direction Of The Cold / Hot Air Flow

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

1. Air Conditioner Motor parameters

Air-conditioning motor rated voltage 12vdc; phase 4; reduction ratio of 1/85; step angle 7.5 / 85; drive four-phase eight beat; DC resistance 130Ω ± 7% (25 ℃); no load frequency 500hz; Pullout frequency 800hz pull-in torque ≥ (100hz); insulation resistance ≥ 100mΩ dielectric dielectric strength 600vac / 1ma / 1s; insulation class a.

2. The role of Air Conditioner Motor

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

3. Air-conditioning motor works

The operation of the air-conditioning motor is that when the phase windings are energized, the flux passes from the positive teeth and passes through the rotor of the soft core and flows to the negative phase with the shortest path, while the other six teeth are non-magnetic through. In order to minimize the magnetic flux, under the action of the magnetic field force, the rotor is forced to move, so that the nearest pair of teeth and the excitation of a match.

Air Conditioner Motor is an important noise source of the air conditioning system, especially the indoor unit of the air conditioner, the electromagnetic noise frequency of the motor is low, the tone is close to the single frequency pure tone, and the working condition of the motor can be judged by the recognition of the air conditioner motor noise.

There are many ways to identify the motor noise, this paper describes a practical load replacement method. Air conditioner motor electromagnetic noise for a variety of reasons, the characteristic frequency is generally related to the power frequency. Simply use a simple load replacement method, you can distinguish due to uneven magnetic field caused by abnormal vibration or overload caused by vibration. Take an air conditioning indoor fan as an example, the motor noise frequency has 600Hz peak. Since the frequency does not change with the speed of the motor, and the noise disappears with the power cut off, it is determined as the electromagnetic noise of the motor.

Electromagnetic noise is generally caused by poor electromagnetic design, stator and rotor loosening caused by abnormal electromagnetic vibration caused. In order to determine the source of electromagnetic sound, the use of replacement load approach.

(1) the weight of the fan; (2) the center of gravity of the fan load on the motor shaft position (for static, dynamic balance of the good leaves, the center should fall on the geometric axis), that is, Length of cantilever. Replace the same weight after the fan, the same speed in the case of the motor 600HZ electromagnetic sound completely disappeared. Comparison found that the original center of gravity relatively forward, away from the motor before the bearing, so that the motor shaft cantilever lengthened, the motor rotation, causing the rotor eccentric increase.

The failure of the motor is an important reason for the noise of the air-conditioning indoor unit. To completely identify the noise source of the motor, in addition to identifying the characteristic frequency according to the conventional method, it is necessary to combine the acoustic theory with some characteristic faults which are not obvious With other identification methods. (2) motor load is too large (cantilever is too long) will cause the motor electromagnetic noise, the vibration frequency may exceed 500HZ. (2) the motor load is too large (cantilever is too long) will cause the motor electromagnetic noise, the vibration frequency may exceed 500HZ.