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What are the main selection methods of three-phase asynchronous motors

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What are the main selection methods of three-phase asynchronous motors

来源: http://dntgm.com点击: Release date: 2018-12-07 00:00 source: http : //dntgm.comclick :

What are the main selection methods of three-phase asynchronous motors


1.Select the form of three-phase asynchronous motor according to the surrounding environment of the three-phase asynchronous motor installation site


There are two common forms of three-phase asynchronous motors for rural use: guarded and enclosed. Protective ventilation performance is good, the price is low, suitable for use in dry and dust-free places; if there is more dust and water droplets splash, closed three-phase asynchronous motors should be used. Such as three-phase asynchronous motors can be used in agricultural and sideline processing machinery and water pumps. In addition, there is a sealed three-phase asynchronous motor that can be immersed in water to work. Electric submersible pumps use this three-phase asynchronous motor. GB motor .

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2. Select the power of the motor according to the use load


The power of the three-phase asynchronous motor should generally be 1.1 to 1.5 times the production mechanical power. If the power selection is too large, it not only increases investment, but also reduces mechanical efficiency and increases production costs. If the power selection is too small, the motor will be overloaded for a long time, which will cause the temperature to rise too high and damage the insulation, shortening the service life of the three-phase asynchronous motor. GB motor.


3. Select the three-phase asynchronous motor according to the speed requirements and transmission method of the working machine


Speed matching principle is to make the three-phase asynchronous motor and production machinery run at rated speed, and the transmission mode is the same. GB motor.


Common fault types of low-voltage motors


Now the technology and production technology of microcomputer protection devices are becoming more and more mature, and they are more and more widely used in the protection of low-voltage motors, which greatly improves the safety and stability of motor operation, but there are still many motors configured due to protection schemes. Irrationality leads to failure to accurately and timely remove faults and burns, which seriously affects normal production work. Now the power system is stable enough, the voltage control is becoming more and more precise, and the motor failure due to voltage deviation is rare. This article only discusses various current-type protection. Common fault types of low-voltage motors are phase-to-phase or three-phase short-circuit, ground fault, phase loss, three-phase imbalance, motor stall, blockage, overload operation, etc., as far as possible, ensure that each fault and abnormal operation mode The corresponding protection is activated to alarm or trip the motor directly.

Related tags: Single-phase motor

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