Fluorine plastic pump why general motors cannot be used when the frequency conversion motor, what is the difference between motor?

Fluorine plastic pump was made using fluorine plastic material of high temperature casting pump, fluorine plastic pump with fluorine plastic centrifugal pump, fluorine plastic magnetic pump, fluorine plastic pipeline water pump, fluorine plastic self-priming pump, etc. , fluorine plastic in the form of motor driven water pump running, when the user chooses according to need, anti-corrosion type, type and frequency conversion, etc. , some users in the selection of ordinary motor using frequency converter, the motor have any effect, can use, what is the difference between ordinary motor and frequency conversion motor? General motors is designed according to the constant frequency and constant pressure, can't completely adapt to the requirement of frequency inverter speed control, so you can't do more frequency conversion motor used. A, general motors and frequency conversion motor design differences between 1, for ordinary asynchronous motor, electromagnetic design and the performance of the main consideration when the design parameter is the 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. 2, the structure design in the structural 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. Second, the influence of the frequency converter for motor mainly in the motor efficiency and temperature rise of inverter in the run can produce different degree of harmonic voltage and current, make the motor run in non-sinusoidal voltage, power flow, which will cause a higher harmonic of motor rotor stator copper loss, copper loss, iron loss and additional loss increase, notably the rotor copper loss, the loss will make motor extra heat, low efficiency, output power decreases, and common motor temperature rise will increase 10% to 20%. Three, when low speed cooling problem when power frequency is low, the power loss caused by higher harmonic in the larger; Second alternative motor speed to reduce the cooling air volume and three direct ratio decreases, and the rotational speed of the motor heat do not go out, a sharp increase in temperature is difficult to realize the constant torque output. Four, motor insulation strength problem from several thousand to more than 10 KHZ inverter carrier frequency, enables the motor stator winding to withstand high voltage build-up rate, equivalent to impose great impulse voltage gradient on motor, load the turn-to-turn insulation of the motor with more severe test. Five, harmonic electromagnetic noise and vibration of ordinary motor using frequency inverter power supply, can make the electromagnetic, mechanical, ventilation and other factors caused by the vibration and noise becomes more complicated. Variable frequency power supply is contained in every harmonic and motor electromagnetic part inherent space harmonic interfere with each other, forming various electromagnetic vibration force, so as to increase the noise. Because of the wide range of the working frequency of the motor, speed range is big, all kinds of the electromagnetic wave frequency is difficult to avoid the structural natural vibration frequency of motor. Six, in view of the above situation, frequency conversion motor USES the following design: 1, general motors only need to consider the power frequency motor startup process and the working condition of a power frequency point, and then design the motor; The need to consider the boot process and frequency conversion motor and inverter all points within the scope of work, and then design the motor. 2, in order to adapt to the inverter output PWM adjustable width sinusoidal alternating current (ac) contains a lot of harmonic wave simulation, specialized production of variable frequency motor, its action can be understood as a reactor is actually and general motors. 3, frequency conversion motor winding capacitance of a little bit small, silicon steel sheet resistance is big, the high frequency pulse of motor is small, the influence of motor inductance filtering effect is better. 4, minimize the stator and rotor resistance, reduce the fundamental wave copper consumption, to compensate for higher harmonic caused by copper loss increase unsaturated 5, the main magnetic field design, one is to consider will deepen higher harmonic magnetic circuit saturation, 2 it is to consider in the low frequency in order to improve the output torque can be appropriately increase the output voltage of inverter 6, structural design, mainly is the insulation level; Full consideration to the vibration and noise of the motor problem; By forced air cooling, cooling mode, main motor cooling fan adopts independent motor drive method, the strong cold wind fan's role is to ensure that the motor at low speed of cooling. Seven, how to distinguish between ordinary motor and frequency conversion motor? Common difference in the structure of motor and frequency conversion motor 1 demand a higher vibration and noise, the frequency conversion 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. 2, frequency conversion motor cooling way different frequency conversion motor generally adopts the forced ventilation cooling, namely USES the independent main motor cooling fan motor driver. 3, different frequency conversion motor cooling fan cooling system USES the independent power supply, ensure continuous cooling capacity. 4, insulation level higher average frequency conversion motor insulation class F or higher, strengthen the insulation and line turn insulation strength, especially want to consider the ability of impact resistance voltage insulation. 5, different requirements for protection of 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.
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