Fluorine plastic pump why general motors cannot be used when the frequency conversion motor?

Fluorine plastic pump is conveying liquid alkali salt pump, there are four fluorine fluorine plastic pump centrifugal water pump, magnetic water pump four fluorine, according to the requirements of different media, choose different type of pump, fluorine plastic water pump adopts motor form, users in the motor, why cannot be used when the frequency conversion motor, ordinary motor is the difference? 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. 1, low speed of cooling problem when power frequency is low, the power of the loss caused by higher harmonic; 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. 2, 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, as significant is 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%. 3, 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. 4, 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. 5, in view of the above situation, frequency conversion motor USES the following design: minimize the stator and rotor resistance, reduce the fundamental wave copper consumption, to compensate for higher harmonic caused by copper loss increase unsaturated main magnetic field design, one is considered 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 structure 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. Frequency conversion motor winding capacitance of a little bit small, silicon steel sheet resistance is big, so that high frequency pulse of motor is small, the influence of motor inductance filtering effect is better. General motors only need to consider the power frequency motor starting 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. 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 frequency conversion motor, its action can be understood as a reactor is actually and general motors.
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