100HP Industrial Compressor

1. Adopt latest technology cooperation, high reliability.

2. Oil Cooling Permanent Magnetic Motor.

3. IP54 protection grade & heavy duty air filter, suitable for high dusty environment.

4. IE4 Efficiency motor efficiency.

5. Most energy saving mode, Only work at loading.

How to solve the influence of the inverter on the motor

1. The efficiency and temperature rise of the motor

Regardless of the type of frequency converter, the frequency converter uses frequency conversion technology and microelectronics technology to control the power transmission components of the AC motor by changing the frequency and amplitude of the motor's working power supply. During operation, different levels of harmonic voltage and current are generated, so that the motor runs under non-sinusoidal voltage and current. According to the information, taking the commonly used sine wave PWM inverter as an example, its low-order harmonics are basically zero, and the remaining high-order harmonic components, which are about twice as large as the carrier frequency, are: 2u+1(u Is the modulation ratio).

PWM, or pulse width modulation, is a control technology that uses the digital output of a microprocessor to control analog circuits. PWM is widely used in measurement, communication and power due to its advantages of simple control, flexibility, high efficiency and good dynamic response. Many areas of control and transformation. PWM is a term used in switching regulated power supplies. This is classified according to the control mode of voltage stabilization. In addition to the PWM type, there are also PFM and PWM and PFM hybrid types. Nowadays, many microcontrollers have PWM controllers. 100HP Industrial Compressor

High-order harmonics will cause the increase of stator copper loss, rotor copper (aluminum) loss, iron loss and additional loss, the most significant is the rotor copper (aluminum) loss. Because asynchronous motors are the most widely used and the most demanded of all types of motors. The asynchronous motor generates electromagnetic torque by the interaction of the air gap rotating magnetic field and the induced current of the rotor winding, so as to realize the conversion of electromechanical energy into mechanical energy. It is used as an asynchronous motor for motor operation. Because the rotor winding current is generated by induction, it is also called an induction motor.

It rotates at a synchronous speed close to the fundamental frequency. Therefore, after the high-order harmonic voltage cuts the rotor bar with a large slip, a large rotor loss will be generated. In addition, it also needs Consider the additional copper loss due to the skin effect. These losses will cause the motor to generate additional heat, reduce the efficiency, and reduce the output power. For example, if an ordinary three-phase asynchronous motor is operated under the non-sinusoidal condition of the inverter output, its temperature rise will generally increase by 10%-20%. A device that provides power to an electronic device, also called a power supply, which provides the electrical energy required by all the components in the computer. 100HP Industrial Compressor

2. The insulation strength of the motor

At present, many small and medium-sized frequency converters adopt PWM control method. Their carrier frequency is about several thousand to ten kilohertz. This makes the motor stator winding to withstand a high voltage rise rate, which is equivalent to applying a steep voltage to the motor. The high impulse voltage makes the inter-turn insulation of the motor bear more severe tests. In addition, the rectangular chopping impulse voltage generated by the PWM frequency converter is superimposed on the motor operating voltage, which poses a threat to the motor's ground insulation, and the ground insulation will accelerate aging under repeated impacts of high voltage.

3. Harmonic electromagnetic noise and vibration

When an ordinary asynchronous motor is powered by a frequency converter, the vibration and noise caused by electromagnetic, mechanical, ventilation and other factors will become more complicated.

The variable frequency power supply transforms the alternating current in the mains from AC→DC→AC, and outputs a pure sine wave. The output frequency and voltage are adjustable within a certain range. It is different from the frequency conversion speed controller used for motor speed control, and it is also different from the ordinary AC stabilized power supply. The ideal AC power supply is characterized by stable frequency, stable voltage, zero internal resistance, and a pure sine wave (without distortion). The variable frequency power supply is very close to the ideal AC power supply. Therefore, advanced developed countries are increasingly using variable frequency power Used as a standard power supply in order to provide the best power supply environment for electrical appliances and facilitate the objective assessment of the technical performance of electrical appliances. There are two main types of variable frequency power supplies: linear amplification and S PWM switching.

The time harmonics contained therein interfere with the inherent spatial harmonics of the electromagnetic part of the motor to form various electromagnetic exciting forces. When the frequency of the electromagnetic force wave is consistent with or close to the natural vibration frequency of the motor body, resonance will occur, thereby increasing noise. Due to the wide operating frequency range of the motor and the wide range of rotation speed, the frequency of various electromagnetic force waves is difficult to avoid the natural vibration frequency of each component of the motor. 100HP Industrial Compressor

4. The adaptability of the motor to frequent starting and braking

Since the inverter is used for power supply, the motor can be started at a very low frequency and voltage without inrush current, and various braking methods provided by the inverter can be used for rapid braking, in order to achieve frequent starting and braking. The conditions are created so that the mechanical system and electromagnetic system of the motor are under the action of cyclic alternating force, which brings fatigue and accelerated aging problems to the mechanical structure and the insulating structure.

5. Cooling problem at low speed

First of all, the impedance of the asynchronous motor is not ideal. When the power supply is a device that provides power to electronic equipment, also called a power supply, it provides the electrical energy required by all the components in the computer. When the frequency is lower, the loss caused by the higher harmonics in the power supply is greater. Secondly, when the rotation speed of the ordinary asynchronous motor is reduced, the cooling air volume decreases in proportion to the third power of the rotation speed, which causes the low-speed cooling of the motor to deteriorate and the temperature rises. A sharp increase makes it difficult to achieve constant torque output. 100HP Industrial Compressor

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