Corrosion resistant pump is the difference between ordinary motor and frequency conversion motor?

Chemical plant in the production of conveying liquid is corrosion resistant water pump is a commonly used transportation equipment, it is important to the composition of corrosion resistant pump motor components, for the type of motor is very much also, level 2, 4, 6, 8. Type type, explosion-proof type, frequency, etc. , then under what conditions need to use type motor frequency conversion? The difference between where ordinary motor and frequency conversion motor? Difference from the design at first, the structure design, the structure design, main is to consider the insulation of the non-sinusoidal power characteristics of frequency conversion motor structure, the influence of vibration and noise cooling way, etc. 1, insulation level higher: general frequency conversion motor insulation class is F or higher, strengthen the insulation and line turn insulation strength, especially want to consider the ability of impact resistance voltage insulation. 2, different requirements for protective measures: the capacity of more than 160 kw variable frequency motor bearing insulation measures should be adopted. Mainly produces magnetic circuit asymmetry, also can produce shaft current, while the rest of the high frequency component generated by the current role in combination, shaft current will increase greatly, which can lead to bearing damage, so often insulation measures. For constant power variable frequency motor, when the rotation speed of more than 3000 / min, should use high temperature resistant special grease, to compensate for the temperature of the bearing. 3, different cooling system: frequency conversion motor cooling fan with independent power supply, ensure continuous cooling capacity. 4, demand a higher vibration and noise of variable frequency motor, frequency conversion motor, we must give full consideration to the motor components and overall rigidity, trying to improve its natural frequency, in order to avoid and every force wave resonance phenomenon. 5, frequency conversion motor cooling way: generally USES frequency conversion motor forced air cooling, namely USES the independent main motor cooling fan motor driver. Second, for ordinary asynchronous motor, electromagnetic design and performance parameters of the main consideration when the design is overload capacity, starting performance, efficiency and power factor. And frequency conversion motor, because of the critical slip inverse ratio at power frequency, you can directly start when critical slip is close to 1, therefore, overload capacity and startup performance is not need to think too much, and to solve the key problem is how to improve the ability to adapt the motor of the non sine wave power. Ordinary asynchronous motor is designed by constant frequency and constant pressure, can never completely adapt to the requirements of the frequency control of motor speed. Forced to the general motor installed inverter used, can bring a lot of disadvantages, the following is the influence of the frequency converter for motor. Three, harmonic electromagnetic noise and vibration of ordinary asynchronous motor using frequency inverter power supply, can make the electromagnetic, mechanical, ventilation and other factors caused by the vibration and noise becomes more complicated. Frequency conversion power harmonic and motor electromagnetic part contains all of the time the inherent space harmonic interference each other and form all kinds of electromagnetic vibration force. When the electromagnetic wave frequency and motor of the body's natural vibration frequency is consistent or close to, will produce resonance phenomenon, so as to increase the noise. Due to the motor operating frequency range wide, wide speed change range, all kinds of the electromagnetic wave frequency is difficult to avoid the components of the motor of the inherent vibration frequency. Middle and small intensity of four, the insulation of the motor frequency converter, is to use PWM control mode. He is about several thousand to more than 10 KHZ carrier frequency, which makes the motor stator winding to withstand high voltage build-up rate, equivalent to impose great impulse voltage gradient on motor, the motor of the turn-to-turn insulation withstand ordeal. In addition, the rectangular produced by PWM inverter chopper superposition of impulse voltage on the motor running voltage, would pose a threat to ground insulation of motor, the ground under the repeated impact of high voltage insulation can accelerate ageing.
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