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空压机变频电动机的特点介绍
Time:2018-07-30 15:35:00       来源:http://www.jnkbjx.com/      

1、电磁设计对普通异步电动机来说,在设计时主要考虑的性能参数是过载能力、启动性能、效率和功率因数而变频电动机,由于临界转差率反比于电源频率,可以在临界转差率接近1时直接启动,因此,过载能力和启动性能不再需要过多考虑,而要解决的关键问题是如何改善电动机对非正弦波电源的适应能力。方式一般如下:
1. Electromagnetic design for ordinary asynchronous motor, the main performance parameters in the design of asynchronous motor are overload, starting performance, efficiency and power factor. As the critical transfer ratio is inversely proportional to the power frequency, it can start directly when the critical transfer rate is close to 1. Therefore, the overload capacity and starting performance are no longer. The key problem to be solved is how to improve the adaptability of the motor to the non sinusoidal power supply. The general way is as follows:
尽可能的减小定子和转子电阻。减小定子电阻即可降低基波铜耗,以弥补高次谐波引起的铜耗增。
Reduce the stator and rotor resistance as much as possible. Reducing the resistance of the stator can reduce the copper consumption of the fundamental wave to compensate for the increase of copper consumption caused by the high harmonics.
为抑制电流中的高次谐波,需适当增加电动机的电感。但转子槽漏抗较大其集肤效应也大,高次谐波铜耗也增大。因此,电动机漏抗的大小要兼顾到整个调速范围内阻抗匹配的合理性。
In order to suppress the higher harmonics in the current, it is necessary to increase the inductance of the motor properly. However, the larger leakage effect of rotor slot is, the larger the skin effect is, and the higher harmonic copper consumption is also increased. Therefore, the size of motor leakage should take into account the rationality of impedance matching in the whole speed range.
变频电动机的主磁路一般设计成不饱和状态,一是考虑高次谐波会加深磁路饱和;二是考虑在低频时,为了提高输出转矩而适当提高变频器的输出电压。
The main magnetic circuit of the frequency conversion motor is generally designed as an unsaturated state. One is to consider the high order harmonics to deepen the magnetic circuit saturation; two is to improve the output voltage of the inverter in order to improve the output torque at low frequency.
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2、结构设计在结构设计时,主要也是考虑非正弦电源特性对变频电机的绝缘结构、振动、噪声冷却方式等方面的影响。一般注意以下问题:
2. When structural design is designed, the influence of non sinusoidal power supply on the insulation structure, vibration and noise cooling mode of the variable frequency motor is also considered. General attention is given to the following questions:
绝缘等级,一般为F级或更高,加强对地绝缘和线匝绝缘强度,特别要考虑绝缘耐冲击电压的能力。
Insulation grade, generally F or higher, to strengthen the ground insulation and turn insulation strength, especially considering the ability of insulation to withstand shock voltage.
对电机的振动、噪声问题,要充分考虑电动机构件及整体的刚性,尽力提高其固有频率,以避开与各次力波产生共振现象.
The vibration and noise of the motor should be taken into full consideration of the rigidity of the motor components and the whole, and the inherent frequency of the motor should be improved in order to avoid the resonance of every force wave.
冷却方式:一般采用强迫通风冷却,即主电机散热风扇采用独立的电机驱动。
Cooling mode: forced ventilation cooling is commonly used, namely the main motor cooling fan is driven by an independent motor.
防止轴电流措施,对容量超过160kW电动机应采用轴承绝缘措施。主要是易产生磁路不对称,也会产生轴电流,当其它高频分量所产生的电流结合一起作用时,轴电流将大为增加,从而导致轴承损坏,所以一般要采取绝缘措施。
To prevent shaft current measures, bearing insulation measures should be adopted for motors with capacity exceeding 160kW. The main reason is that it is easy to produce asymmetrical magnetic circuit, and also produce axial current. When the current produced by other high frequency components is combined together, the axial current will increase greatly, which leads to the damage of the bearing, so insulation measures are generally adopted.
对恒功率变频电动机,当转速超过3000/min时,应采用耐高温的特殊润滑脂,以补偿轴承的温度升高。
For constant power variable frequency motor, when the speed exceeds 3000/min, special grease with high temperature resistance should be used to compensate the temperature rise of the bearing.
以上就是为大家介绍的有关 济南空压机http://www.jnkbjx.com 的详细的介绍,希望对您有所帮助.如果您有什么疑问的话,欢迎联系我们.我们将以最专业的态度,为您提供服务.
The above is a detailed introduction to the Ji'nan air compressor http://www.jnkbjx.com, I hope to help you. If you have any questions, welcome to contact us. We will provide you with the most professional attitude.

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