Ordinary 22kw squirrel cage motor inverter will not work 20

It depends on what industry you use it for, strictly speaking, it is not allowed.

If you generally run at 30-50hz, you can barely use it, just pay attention to the heat of the motor so as not to burn out your motor.

Regarding the consequences of the inverter with ordinary motors, a brief introduction is as follows:

Due to the carrier frequency with high harmonics in the power supply of the inverter, there is a great change in performance compared with the asynchronous motor of the power frequency

The efficiency decreases by about 1%-3%;

The current is increased by about 10%;

The power factor is reduced by about 10%.

The temperature increases by about 10%-20%;

Electromagnetic noise and vibration increase, general noise increases by 10-15 decibels;

The winding coil is subjected to high impulse voltages; PMW control mode, carrier frequency tens of kilohertz, so that the winding line withstand the voltage rise rate du HT value is very high, due to repeated impulse voltage, so that the coil insulation aging damage, easy to lead to the motor turn-to-turn, interphase short circuit, and even burn the motor.

Due to the magnetic imbalance of the motor using the inverter, the voltage difference between the two ends of the motor shaft, that is, the shaft voltage, can cause the bearing film to break down and discharge, destroy the lubrication, and cause bearing damage.

At low frequency and low speed, the air volume meets the requirements, which affects the heat dissipation of the motor.

Ordinary motors cannot meet the requirements of constant torque at low frequencies and constant power at high frequencies.

Ordinary motor insulation is not good for voltage impact ability, and the power supply with inverter will greatly shorten the life, in fact, the noise will generally be much larger.

Yes, just pay attention to the low speed to use the fan to force air cooling to dissipate heat, otherwise it will be burned!

Yes, but the frequency conversion range is not large.

Yes, all, the frequency is limited to 50, and most of the squirrel cage motors on the market are now. Who said it can't be beaten!

It depends on what kind of motor you are, whether the starting is required to be stable, and the requirements have little impact on the power grid (generally when the grid voltage is insufficient and the capacity of the distribution transformer is insufficient, the direct start of the high-power motor will affect the surrounding electricity). Specifically, the winding motor should be started with a series of resistance, and the ordinary squirrel cage asynchronous motor can be started directly, but the starting current is very large (7-8 times the rated current), the time is 1-3s, the starting time is related to the load, the large load time is long, the small load is short, and the starting stability is poor. If the frequency conversion start, the starting current is small, the starting time is adjustable, and the starting speed is stable, but the frequency converter is expensive, and it is generally used for speed regulation, and it is a waste to start alone.

In addition, if the motor is not a variable frequency motor, it is recommended not to run it above its rated frequency. It is an inverter motor, which can be set according to the frequency range of the inverter motor.

The advantage of frequency conversion is that it is energy-saving, if you simply consider the starting characteristics of the motor It is recommended to use a soft start device, which is lower than frequency conversion.

It is recommended that you use Star Delta to start more economically.

OK. Frequency conversion speed regulation is a speed regulation method that changes the frequency of the stator power supply of the motor, thereby changing its synchronous speed. The main equipment of the frequency conversion speed regulation system is the frequency converter that provides the frequency conversion power supply, and the frequency converter can be divided into two categories: AC DC AC frequency converter and AC AC frequency converter.

This method is suitable for occasions that require high precision and good speed regulation performance.

Characteristics of ordinary three-phase asynchronous motor using frequency converter speed regulation:

1. High efficiency, no additional loss in the process of speed regulation.

2. It has a wide range of applications and can be used for cage asynchronous motors.

3. The speed regulation range is large, the characteristics are hard, and the precision is high.

4. The technology is complex, the cost is high, and the maintenance and repair are difficult.

Yes, if the motor runs at low speed for a long time during use, it is necessary to add an independent heat dissipation hood to the motor, because the heat dissipation fan of the three-phase asynchronous motor can no longer effectively dissipate heat for the motor.

Please choose a frequency converter greater than or equal to the motor power, if there is a ready-made frequency converter with greater power than the existing motor can be used, just need to adjust the motor power, current limiting, acceleration and deceleration time in the frequency converter.

In addition to regulating the speed of the asynchronous motor, the inverter also has many built-in protection functions such as overcurrent, overvoltage, undervoltage, overload, overheating, etc., to ensure the safe, stable and reliable operation of the motor.

1.Pole change logarithmic speed regulation method. The red connection mode of the stator winding is changed to change the number of stator pole pairs of the cage motor to achieve the purpose of speed regulation. It is suitable for dry production machinery that does not require stepless speed regulation.

2.Frequency conversion speed regulation method. It is a speed regulation method that changes the frequency of the stator power supply of the motor and thus changes its synchronous speed. It is suitable for occasions that require high precision and good speed regulation performance.

3.Cascade speed regulation method, cascade speed regulation refers to the series of adjustable additional electric potential in the rotor circuit of the wound motor to change the slip of the motor to achieve speed regulation.

Operates at lower speeds. The greater the resistance of the series, the lower the rotational speed of the motor.

5. Stator pressure regulation and speed regulation method. When the stator voltage of the motor is changed, a set of different mechanical characteristic curves can be obtained, and thus different speeds can be obtained.

The DC excitation power supply is small, usually composed of a single-phase half-wave or full-wave thyristor rectifier, changing the conduction angle of the thyristor, can change the size of the excitation current.

In the shell, the shell is filled with a certain amount of working liquid, when the pump wheel rotates under the drive of the prime mover, the liquid in it is driven by the blades and rotates, and when it enters the turbine along the outer ring of the pump wheel under the action of centrifugal force, the turbine blades are thrusted on the same steering to make it drive the production machinery to operate.

Hello, dear, this can be adjusted. The above is the speed regulation method of ordinary three-phase asynchronous motor.

Ordinary three-phase asynchronous motors can be adjusted in speed.

If it is a squirrel cage motor, only use the inverter to regulate the speed, and if it is a winding motor, there are many ways to regulate the speed

1.The frequency converter is used to change the frequency of the power supply to regulate the speed, the speed regulation range is large, the stability and smoothness are good, and the mechanical characteristics are hard. That is, with the added rated load, the speed drops less. It belongs to stepless speed regulation. It is suitable for most squirrel cage asynchronous motors and wired asynchronous motors.

2.Changing the logarithmic speed regulation of the magnetic pole belongs to step-by-step speed regulation, and the smoothness of the speed regulation is poor, and it is generally used in metal cutting machine tools.

3.Change the slip rate to adjust the speed.

1) Rotor loop string resistance: used for AC wound asynchronous motor. The speed regulation range is small, the resistance consumes power, and the motor efficiency is low. Generally used for cranes.

2) Change the power supply voltage speed regulation, the speed regulation range is small, the torque drops greatly with the voltage drop, and the three-phase motor is generally not used. It is used for single-phase motor speed regulation, such as fans.

3) Cascade speed regulation, the essence is that the rotor introduces additional electromotive force and changes its size to regulate the speed. It is also only used for wound motors, but the efficiency is improved.

Answer: I am trying to sort out the information for you, please wait a moment, the current small and medium-sized inverters, many of them are controlled by PWM. His carrier frequency is about several thousand to more than ten thousand hertz, which makes the stator winding of the motor to withstand a high voltage rise rate, which is equivalent to applying a steep impulse voltage to the motor, so that the inter-turn insulation of the motor can withstand a more severe test. In addition, the rectangular chopper impulse voltage generated by the PWM inverter is superimposed on the motor operating voltage, which will pose a threat to the ground insulation of the motor, and the ground insulation will accelerate the aging under the repeated impact of high voltage.

Hope it helps!

Frequency conversion speed regulation is normal to use frequency conversion speed regulation motor, but many manufacturers use ordinary motors to replace them in order to save money, so there are the following problems:

1.When the motor runs at low speed, the heat dissipation of the motor is poor due to the low speed, resulting in the temperature of the motor being too high.

2.The windings of ordinary motors are not treated with anti-higher harmonics, which will cause abnormal inter-turn short circuits of the motor.

Excluding the following two points, there is no other difference between ordinary motors and inverter motors.

Generally the motor itself can. However, heat dissipation must be considered! Because the fan of the general squirrel cage motor is connected to the shaft end, if the motor speed is reduced with the inverter, the air volume will drop rapidly with the decrease of the motor speed, so that its heat dissipation situation deteriorates rapidly.

Therefore, it is usually necessary to install an additional fixed-speed fan to dissipate heat.

It depends on the nature of the load your motor carries. If it is a constant power load, such as a fan or water pump, there should be no problem; But for constant torque, such as cranes, hoists, etc., it is difficult to say. The reason is very simple, that is, because at low frequency, the DC component in the current increases and increases the iron loss, which accelerates the heating of the motor, and the decrease in speed greatly reduces the efficiency of the motor wing--- so it is necessary to be cautious in installing the frequency conversion system in this kind of load.

To do the motor frequency conversion speed regulation experiment, just use an ordinary AC motor. DC motor can also realize frequency conversion, such as the current DC inverter air conditioner: it converts the power frequency alternating current into DC power supply, and sends it to the power module, the module is controlled by the control signal sent by the microcomputer, and the difference between AC frequency conversion is that the module output is controlled DC power supply sent to the DC motor of the compressor to control the displacement of the compressor, so as to achieve "frequency conversion speed regulation".

Yes, as long as it is a motor, the speed can be adjusted with a frequency converter.

There are too many types of motors, servo motors, general.

They are all equipped with servo drives, and DC motors cannot be controlled by frequency converters.

In general, frequency converters are suitable for three-phase asynchronous motors. It is said that there are inverters for single-phase motors, but I have never seen the actual thing.

The selection of the inverter not only depends on the power of the motor, but also depends on the rated current of the motor, as long as the rated current of the inverter is equal to the rated current of the motor, or slightly larger, there is no problem.

In the inverter industry, there is a selection rule, that is, the power of the inverter, the maximum power of the motor can not exceed 2 gears, for example, your 11kw motor, you can use a 15kw inverter, you can choose the inverter, but it is best not to use a 22kw inverter. The reason why there is this rule is because if the rated current of the inverter is much larger than the rated current of the motor, the protection function of the inverter becomes a decoration.

All BAI motors can be inverted.

DC motor plus straight du

Rheology inverter, AC ZHI current motor plus DAO flow converter.

The special selection of the inverter mainly considers the driving current and the speed range, the 160kw motor is selected as the 160kw inverter, the power margin has been considered in the design, there is no need to choose large, unless the motor has the possibility of overload operation.

The inverter selection will increase the cost of investment, and because the limited current can be adjusted, it has no impact on the operation of the motor.

160kw motor choose 180-200kw inverter, inverter selection is not affected, as long as the motor quota current is correctly input.

The inverter has two functions, one is the process requirement that needs to be regulated, and the other is that some equipment does not need full speed for a long time in the work.

Answer: The place where it runs (such as the fan and water pump), so that the frequency conversion can save energy. Of course, some can also be used to achieve soft start and soft stop, but it will be a bit big and too small.

The selection of the inverter is best determined according to the working current of the motor.

At present, the usual frequency converter is a single-phase change three-phase, three-phase change three-phase alternating current or alternating current-alternating frequency converter, so it can only be used for the "three-phase asynchronous motor" in the classification diagram.

If your inverter is of other special kinds, it can only be determined according to the actual situation.

Let's first introduce the inverter motor: from the appearance, the most obvious feature is that the inverter motor has a separate cooling fan, and the cooling fan has a special junction box. The cooling fan needs to be connected to the power frequency power supply separately to ensure that no matter what frequency the motor works at, it will not affect the heat dissipation of the motor.

Secondly, the inverter motor produced by the regular manufacturer will also be adjusted internally, and the insulation will also be strengthened. Whether there is a problem with the inverter with an ordinary asynchronous motor must be analyzed according to the on-site situation. For example, the motor mostly works in the low-frequency region, and if you use an ordinary motor, the motor may be damaged due to poor heat dissipation.

If the motor works mostly in the medium and high frequency area, the ordinary motor can also use the inverter. There is also the insulation problem of ordinary motors, and it is recommended to install an output reactor. Of course, it doesn't have to be.

Frequency converters can be used.

It's just that when it comes to multi-segment speed, you can do it with a little bit of control.

Of course, the inverter can control the ordinary asynchronous motor, and there is no problem with the 6-pole one, and the low-speed control is above 8Hz.

The inverter is used to control the ordinary motor, and if it is a inverter motor, you can use the inverter.

Yes, but not too much.

The inverter can be matched with a three-phase asynchronous squirrel cage motor, not necessarily a variable frequency motor, the variable frequency motor is generally used when the running speed is high, or the running speed is low, for example, the output frequency of the inverter is lower than 20Hz, and long-term operation; Or the operating frequency of the inverter is higher than 70Hz, and long-term operation, in these two cases, it is easier to damage with ordinary motors, therefore, to use inverter motors, not in these two cases, with ordinary motors.

Inverter motors, which can be powered by a soft starter or mains, are also no problem. However, it is a serious waste of resources to spend a lot of money to buy a variable frequency motor to use as an ordinary motor.