Analysis Of Inverter Operation Loss:

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1 Self-loss The inverter's own loss is about 2-4%. The loss of IGBT is divided into conduction loss and switching loss, which is related to the carrier frequency setting. The higher the carrier frequency, the greater the switching loss, the greater the radio interference, and the further away the PWM electromagnetic noise is from the auditory frequency.

2 Input transformer The grid transformer loss increases by 2-5%. The peak current generates harmonic loss, causing the transformer to generate pulse voltage to damage the insulation on the coil. Harmonics also increase electromagnetic loss. At the same time, harmonic loss causes the transformer temperature to rise and the risk of short circuit between coil layers increases.
3 Harmonic suppressor The DC reactor loss is 2-5%. The better the suppression effect, the greater the loss. Medium and large power inverters must be matched with appropriate power factor compensation, that is, harmonic suppression devices, to reduce pulse current.

4 AC reactor The AC reactor loss is 2-5%. The better the suppression effect, the greater the loss. AC reactors must be matched in medium and large power products to reduce harmonic current.

5 Electromagnetic suppressor Each radio interference (EMI) suppressor has a heating loss of about 2-3%. The better the suppression effect, the greater the loss.

6 Drive wire Line loss increases by about 0.5-1%, which is proportional to the cable length and carrier frequency; the cable between the inverter and the motor will have a skin effect due to the PWM high-frequency carrier, which leads to an increase in heating line loss.

7 Drive motor Motor loss increases by about 6-10%, PWM carrier frequency causes stator iron loss to increase, motor heating temperature rise increases by about 10%, PWM generates pulse voltage, causes coil insulation degradation, humid environment causes serious bearing discharge corrosion, and motor PWM electromagnetic noise causes hearing loss of workers.

8 Phase-shifting transformer Both medium and high voltage must add a phase-shifting transformer, and the efficiency of the phase-shifting transformer is only 90% when running at full load, so the operating loss of the medium and high voltage inverter increases by about 25%, which is the most basic loss.

9 The heating of the motor and its accessories causes the temperature rise to increase, resulting in an increase in the power consumption of the workshop air conditioner.

10 Load efficiency is reduced. Fluid, hydraulic, and solenoid valve control loads are all running at a constant speed to maximize the life and operate at the highest efficiency. The frequency converter changes the speed of the drive motor, which means that the load efficiency curve declines and the failure rate increases.

Through the analysis of the ten types of losses in the frequency converter system, it can be known that the use of frequency converters will increase power consumption and grid pollution. Therefore, when frequency converters are used in fluid, hydraulic, and solenoid valve control energy-saving drive control, energy-saving transformation should be carried out to recover 15% of the operating loss, and technical transformation should be carried out to solve the problem of grid environmental pollution. Using Leostar to replace frequency converter energy-saving drive control in fluid, hydraulic, and solenoid valve drive control systems is the best choice, and it also solves the problems of frequency converter energy-saving transformation and technical transformation.

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