The frequency speed of the inverter controlled motor climbs as the load increases

Didn't understand your question.

If you say that the speed of the travel motor increases when the load increases, this is similar to the control of a load inverter such as a fan pump.

My understanding is that the right row is loaded, the left row is unloaded, and then the right row is loaded more and more, and then the car is flying. Isn't it?

And you want to implement a control mode where the speed is not dependent on the load, right?

In this case, if there is no speed feedback to the inverter (or PLC), then only the parameters of the inverter can be adjusted.

Try selecting the control mode of the inverter as speed control.

The lowest frequency of the inverter can theoretically be adjusted, or it depends on the resolution of the frequency of the inverter. However, at this frequency, ordinary motors cannot run for a long time, otherwise, it is easy to burn the motor; In addition, if the frequency is so low, it may be difficult to start the motor, and it is necessary to set parameters such as the "torque gain" or "V-F curve" of the inverter.

In addition, there is a problem, you also need to know one point, that is, the operating frequency of the inverter, the relative value of the harmonic content will be larger, that is to say, in the case of long-term low-frequency operation, it is easier to have harmonic interference problems, in order to prevent the occurrence of harmonic interference problems, it is recommended to select in advance MLAD-V-SR inverter special input filter, inverter special input reactor, LCL harmonic filter, active harmonic filter and other harmonic suppression devices on the rectifier side of the inverter.

1. No, the frequency is low, for the ordinary three-phase asynchronous motor, the heat will be heated, and for the special motor for frequency conversion, because it is an independent fan with forced heat dissipation, the heat dissipation effect is much better. The lowest frequency can be adjusted to 0.

2. Variable-frequency drive (VFD) is a power control equipment that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the working power supply of the motor. The inverter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit, microprocessor unit, etc. The inverter relies on the interruption of the internal IGBT to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation.

With the continuous improvement of industrial automation, frequency converters have also been widely used.

3. Frequency is the number of times that periodic changes are completed per unit of time, and is the quantity that describes the frequency of periodic motion, which is commonly represented by the symbol f or , the unit is one second and the symbol is s-1. In order to commemorate the contribution of the German physicist Hertz, people named the unit of frequency hertz, abbreviated as "hertz", and the symbol is hz. Every object has an amplitude-independent frequency that is determined by its own properties, called natural frequencies.

The concept of frequency is used not only in mechanics and acoustics, but also in electromagnetics, optics and radio technology.

How to control the speed of the inverter in torque mode? Or does the magnitude of a given frequency determine how fast or slow the motor is?

Hello dear<> In the inverter torque mode, the speed of the motor can be controlled by controlling the frequency. Specifically, when it is necessary to reduce the speed of the motor, the output frequency of the inverter can be reduced; On the contrary, when it is necessary to increase the speed of the motor, the output frequency of the inverter can be appropriately increased.

It should be noted that the inverter models and brands of different tanks may have different control methods and parameter settings, so the specific operation methods may be slightly different. If you are unsure how to perform the operation correctly, please refer to your drive's owner's manual or consult the relevant technical support personnel for further assistance. <>

After the inverter reaches the rated power by accelerating for a certain period of time, can it directly drive a light-load motor smaller than it?

Yes, the inverter can add and control the speed of the motor to make it get constant power. When the inverter accelerates the motor, because the load of the motor is small, the power consumption of the motor is small, and the inverter can be controlled to drive the motor. Moreover, the inverter can also adjust the sail stare of the motor through the state lead conversion frequency, so as to adjust the power output of the motor, which is more suitable for small motor models.

When the AC motor uses the frequency conversion leakage speed regulation method, when the frequency changes the precedency, () should also be changed.

a.Current. b.Resistance.

c.Voltage. d.Cable.

Correct Wisdom Roll Answer: c

Summary. It can be appropriately increased (within the forehead).

However, the basic frequency of the ordinary motor is set to 50Hz, and the speed is regulated by constant torque at 50Hz, the torque is basically unchanged, the speed decreases, and the actual output power becomes smaller.

Above 50Hz, it is constant power speed regulation, the speed rises, the torque decreases, and the actual output power is basically unchanged.

For common AC asynchronous (shaded pole, squirrel cage, capacitance fault phase) motor, the speed is determined by the period of the rotating magnetic field, and the period of the rotating magnetic field is determined by the input AC frequency, under the condition of power frequency (50Hz), the period of the rotating magnetic field can not be adjusted, so the input voltage has to be adjusted to change the rotor torque speed regulation, but the problem is that the difference between the cycle of the rotating magnetic field and the actual operating cycle of the motor is too large. And the eddy currents formed by the slip frequency will be wasted in the rotor circuit!

When the output voltage of the inverter rises but the frequency does not rise, will the motor speed increase?

Hello dear<> I've seen your question and I'm trying to sort out the answer, and I'll get back to you in five minutes, so please wait a minute

It can be appropriately increased (within the total work) but the basic frequency of the ordinary motor is set to 50Hz, and the speed is regulated by constant torque at 50Hz, the torque is basically unchanged, the speed decreases Changhui, and the actual output power becomes smaller. Above 50Hz, it is a constant power speed regulation, the speed rises, the torque starts and does not decrease, and the actual transmission and quiet power is basically unchanged. For common AC asynchronous (shaded pole, squirrel cage, capacitance fault phase) motor, the speed is determined by the period of the rotating magnetic field, and the period of the rotating magnetic field is determined by the input AC frequency, under the condition of power frequency (50Hz), the period of the rotating magnetic field can not be adjusted, so the input voltage has to be adjusted to change the rotor torque speed regulation, but the problem is that the difference between the cycle of the rotating magnetic field and the actual operating cycle of the motor is too large. And the eddy currents formed by the slip frequency will be wasted in the rotor circuit!

The inverter controls the motor to run normally at no load, and the speed becomes slower and the current is high when the load is loaded.

The inverter controls the motor to run normally at no load, and the speed slows down and the current is large when the load is loaded! Hello, happy to answer your <>

The pro-inverter controls the motor to run normally at no load, and the speed becomes slower and the current is large when the load is as follows, which is the inverter stall. Whether the self-learning of the variable liquid first frequency is completed correctly. Whether the inverter is controlled correctly.

Check whether the spindle belt is too loose and the number of feet. The inverter anti-stall function can be enabled. (Yaskawa A1000 series inverter is parameter L3-01, L3-02, L3-03, L3-04, L3-05, L3-06).

The inverters of other manufacturers can check the corresponding inverter manuals. The inverter with motor runs normally at no load, indicating that the protection can avoid the starting current. If the load starts to trip, there is a high probability that the starting time is not suitable.

You first have to check the cause of the trip, whether it is overcurrent or overvoltage, the capacity of the inverter is too small, or the motor has a local short circuit, there is an error when each inverter trips**, we can find**, and then study what causes it. Hope mine can help you <>

Do you have any other questions?