Can ordinary motors be used directly to adjust the speed with frequency converters? Teacher, please

It's completely possible, the inverter directly takes you to the motor, but your motor is best to choose the inverter motor, because the cooling fan of the inverter motor is powered by an independent power supply. The speed at the ground will not prevent the temperature rise of the motor. When the inverter is with the motor, the temperature of the motor is 4 to 5 degrees higher than without the inverter.

Today's frequency converters can guarantee torque output at low frequencies.

It can be used directly;

Ordinary motors are usually used, and special motors matched with frequency converters are used only for very demanding occasions.

The upstairs statement was thirty years ago;

Nowadays, the inverter has a lot of power, and the frequency conversion speed regulation technology is replacing the DC motor, and the slip motor is an old thing.

Are you already retired?

Question adds: Oh, thank you LNA, when the bottom frequency is small, will the current be larger?

The inverter is designed so that when the frequency is at the bottom, the voltage will also adjust downward, which is automatic, so the current does not increase.

In addition, when using a normal motor, if necessary, add another cooling fan to it. Prevent poor heat dissipation caused by the built-in fan when the speed is too low.

Doesn't the power decrease when the voltage is low? Can you teach me again? Thanks a lot!

When the voltage is low, the power will inevitably decrease, and at the same time, the frequency will become lower and the speed will be slower, which is beyond doubt. However, its torque will remain the same, so the motor can still drag the passive device. On the contrary, when the frequency increases, the voltage will also increase, and the speed will become faster, so the power of the motor will not change, and its torque will become smaller, and after reaching a certain value, the motor will not be able to drag the equipment.

Therefore, when purchasing inverters and motors, this should be taken into account and some power margin should be left.

Yes, it can be used, but it is dangerous.

The power of the inverter is not large, if the motor speed is often adjusted with a DC motor. Slip motor for AC motor.

Generally speaking, ordinary motors can use frequency converters, however, the frequency difference of general matching is not too large.

The inverter is used to change the power frequency of the motor to change the speed of the motor. Therefore, the inverter can be connected to an ordinary motor, and it is also the case at the beginning of the application of the inverter to the motor. However, with the development, some manufacturers have installed the inverter with the ordinary motor, but the principle remains the same.

It can be used, but pay attention to the heat dissipation of the motor when running at low frequency, if the heat dissipation is not solved for too long at low speed, it will affect the life of the motor.

The most honest kind of big-headed machine doesn't know, and the later machine can be used.

If the motor needs to work at low frequency for a long time, it is best to install a separate fan behind it to help dissipate heat, because the coaxial fan with the motor speed is too low to dissipate heat enough, which is easy to cause high temperature of the motor!

Of course, there is a problem to pay attention to, low frequency and long time operation to solve the motor fan heat.

Yes, it is recommended to install a fan.

This kind of ordinary TV series can also use frequency converters, it depends on how you are, do you need it? According to the actual situation.

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Not all motors can be retrofitted with frequency converters.

Only three-phase asynchronous motors and DC motors can be equipped with frequency converters, while other types of motors cannot be controlled with frequency converters.

There are too many types of motors, servo motors, generally equipped with servo drives, DC motors, not controlled by inverters.

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.

Can ordinary motors use frequency conversion?

1. The difference between the design of the variable frequency motor and the ordinary motor lies in the degree of insulation of the bearing, fan and enameled wire, and the ordinary motor cannot withstand the increase of voltage, vibration frequency, insulation, speed and wear resistance after frequency conversion.

2. Ordinary motors can only withstand the frequency of 50 60hz, and I assemble the inverter.

, just adjust the transistor.

The size of the base resistance can be used to boost and buck the voltage, for example, after connecting the bulb, adjusting the resistor will make the bulb gradually brighter. The so-called frequency conversion is to use 50Hz alternating current through the frequency converter.

After rectification, the electrical power provided at this time is provided by increasing the number of oscillations to several hundred kilohertz.

unchanged, (because of the principle that the voltage is increased and the current is reduced after the frequency is increased), to achieve the purpose of the variable frequency motor to increase speed and save electricity.

3. The inverter washing machine at home automatically and gradually increases the speed until it makes a metal chirp when it rotates at high speed, all because the inverter circuit changes the resistance of the oscillation circuit and plays the role of spinning and dehydrating the inverter motor with high-speed rotation.

Summary. The inverter motor is worth running continuously in the range of 10% 100% rated speed at 100% rated load under standard environmental conditions, and the temperature rise will not exceed the calibration tolerance value of the motor.

Is the inverter motor an ordinary motor plus an inverter? Can it be understood in this way?

The inverter motor is worth running continuously under standard environmental conditions, at 100% rated load in the range of 10% 100% rated speed, and the temperature rise will not exceed the motor with the allowable value of the motor calibrated spike.

The inverter motor is worth running continuously under standard environmental conditions, at 100% rated load in the range of 10% 100% rated speed, and the temperature rise will not exceed the motor with the allowable value of the motor calibrated spike.

The inverter motor is actually a motor designed for the inverter, which can be driven by the inverter to achieve different speeds and torques to adapt to the changes in the demand of the load.

The inverter motor is developed from the traditional squirrel cage motor, and the traditional motor fan is changed to an independent fan, and the insulation performance of the motor winding is improved. In the case of low requirements such as low power and frequency, in the case of rated working frequency, it can be replaced by an ordinary squirrel cage motor.

Extended Materials. The principle of frequency conversion energy saving can be known from fluid mechanics, p (power) = q (flow) h (pressure), the flow rate q is proportional to the square of the speed n, the pressure h is proportional to the square of the speed n, and the power p is proportional to the cube of the speed n. That is, the relationship between the power consumption of the pump motor and the speed is approximately proportional.

For example: a pump motor power is 55kw, when the speed drops to 4 5 of the original speed, its power consumption is, power saving, when the speed drops to 1 2 of the original speed, its power consumption is, the power-saving variable frequency motor test generally needs to use the inverter power supply, because the output frequency of the inverter has a wide range of variation, and the PWM wave of the output bending contains rich harmonics, the traditional transformer and the power meter have been unable to meet the measurement needs of the test, and the general Hall voltage, The current sensor does not control and nominate the angular difference index that directly affects the accuracy measurement of the power, and should use the variable frequency power analyzer and the variable frequency power sensor with clear specific difference and angular difference index as the main power measurement instrument. References**:

Encyclopedia - Variable frequency motor.

I hope I can help you, I wish you a happy life and a happy day!

"Ordinary motors can be used to use frequency converters, and there are many such applications. It can be said that the inverter electric phone is designed for the speed regulation of the inverter, but the inverter is not specially designed for the inverter motor. ”