What is the difference between the torque and speed of the inverter motor and the power frequency si

First of all, inverter speed regulation has become the mainstream speed regulation scheme and is widely used in various fields. Mainly because of the many advantages of inverter speed regulation: high efficiency, no additional loss in the process of speed regulation; Wide range of speed regulation; Low starting current; Soft start is convenient, which is conducive to motor protection; It is easy to realize automatic control and remote control.

When the inverter motor runs at the rated frequency, its maximum torque is proportional to the square of the power supply voltage, and as the frequency decreases, the main magnetic flux decreases and the motor torque decreases. At low frequencies, the torque will drop dramatically. In order to improve the low-frequency torque characteristics, it is possible to increase the number of pole pairs of the motor and use deep groove motors such as S-shaped and C-shaped motors.

In addition, some literatures propose to change the number of pole pairs or fractional slots of permanent magnet motors to change the effective pole pairs of the motor, so as to increase the maximum output torque and maximum output speed of the motor.

Regarding the difference between speed and power frequency, theoretically, the speed of the inverter motor is proportional to the frequency of the power supply, and it will also be affected by the number of pole pairs of the motor. The relationship between frequency and speed can be expressed by the formula: n = f * p, where n is the speed, f is the frequency, and p is the number of pole pairs of the motor.

Summary. The motor has an impact on torque after frequency conversion speed regulation. At high speeds, the power increases, and the torque decreases. At low speeds, the torque will increase and the power will decrease.

What kind of changes occur in torque and power after motor frequency conversion speed regulation.

The motor has an impact on torque after frequency conversion speed regulation. At high speeds, the power increases, and the torque decreases. At low speeds, the torque will increase and the power will decrease.

At high speeds, the power increases, and the torque decreases. At low speeds, the torque will increase and the power will decrease. If it is a medium frequency motor, the performance is poor at low speeds.

Good performance at high speeds. Torque is inversely proportional to its rotational speed, the faster the rotational speed, the smaller the torque, and vice versa. Torque is a special moment that causes an object to turn.

Engine torque is the torque that the engine outputs from the crankshaft end. Under the condition of fixed power, it is inversely proportional to the engine speed, the faster the speed, the smaller the torque, and vice versa, it reflects the load capacity of the car within a certain range. The external torque is called torque or external force moment, and the internal torque is called internal force moment or torque.

Kiss, is there anything else you don't understand?

The relationship between motor frequency and rotational speed can be expressed by the formula n = 60 f p.

n—motor speed** minutes).

60—per minute (seconds).

f—Power supply frequency (Hz).

p—the number of pole pairs of the rotating magnetic field of the motor.

Determinants of motor speed:

For synchronous motors or asynchronous motors, the speed of the motor is related to the frequency of the power supply, the number of pole pairs of the motor inspection bureau, the higher the power supply frequency, the fewer the number of pole pairs, the higher the speed; In the case of asynchronous motors, it is also related to the current through the electric coil, the higher the current, the closer its rotational speed is to the synchronous speed. There is also a type of guessing motor (usually AC and DC electric lozenge machine), the speed of which has nothing to do with the frequency of the power supply. It is only related to the magnitude of the current passing through the coil.

General motor speed:

Class 2 motor 3000 rpm.

4-stage motor 1500 rpm.

Class 6 motor 1000 rpm.

Class 8 motor 750 rpm.

Class 10 motor 600 rpm.

16-stage motor 500 rpm.

The speed of the motor is proportional to the frequency, that is, the higher the frequency, the faster the motor speed is disassembled; The lower the frequency skin, the slower the motor speed. This is because in alternating current, the frequency indicates the speed at which the direction of the current changes, and the rotational speed of the motor is precisely determined by the rotational speed of the magnetic field resulting from the change in the direction of the current. Therefore, when the frequency increases, the speed of the change in the direction of the current increases, and the rotation speed of the magnetic field also increases, resulting in an increase in the speed of the motor.

Conversely, when the frequency travel is reduced, the motor speed will also slow down accordingly.

To be from. The fundamental frequency is below the constant torque.

The above is constant power.

The origin of the beginning to understand.

The fundamental frequency is below the constant torque, and above is the constant power. It's the inverter and the asynchronous motor.

Combined with the naturally occurring characteristics of the inverter (although the inverter has measures to prevent stalling at low revs).

When the load changes in the asynchronous motor, the slip also changes, and the rotor current changes with it. The motor output torque is related to the rotor current. Therefore, the inverter only needs to prevent the rotor from over-current, and can achieve constant torque.

It can be seen that the constant torque here does not mean that the torque of the motor remains unchanged, but that the "maximum" torque that the motor can output is constant at different speeds below the fundamental frequency.

For the motor, the output power.

Torque speed, while motor power rating.

It is fixed, so when the rated speed (fundamental frequency) is exceeded, the torque must be reduced so that the output of the motor does not exceed the rated power.

Usually the motor will not work at the maximum torque, and the load below the fundamental frequency will increase, but it will only rise to the "maximum" torque. In this process, the inverter will increase the speed to control this, so that the output power deficit silver dismantling rate will increase accordingly.

If you can't find someone you can ask yourself, and now there are mobile phones and computers.

This is the number of poles you have and the logarithm of your poles.

The misunderstanding of Chunzhou is wrong.

2 poles can only count as 1 pair, not 2 pairs. 60s*60hz 1=3600 rpm water pump 3520 normal. Differential 80 is an asynchronous motor.

speed difference.

The formula you are talking about calculates the rotational speed of synchronization, which is the rotational speed of the magnetic field generated by the three-phase electricity. Negotiation rules.

The practical application of the water pump electric punching machine is an "asynchronous" motor, that is, only when the speed of the motor rotor is lower than the speed of the magnetic field, the rat bar of the rotor can cut the magnetic field lines to produce torque, which is determined by the principle of the asynchronous motor.

This leads to a "slip rate" parameter, the size of which is not the same for different products and different designs.

p is the pole logarithm. Not the number of poles.

The 2-pole motor is 1 pair, the 4-pole motor is 2 pairs, and the 6-pole motor is 3 pairs ---

Changing the frequency will have an effect on the motor torque.

Because the frequency and torque of the motor are corresponding, the parabola of different motors is not the same, and the output torque of the motor is also changed when the reducer is changed, and the reducer increases the torque of the motor by geometric multiples, and the output torque of the motor frequency change is declining in steps, and the output torque decreases not significantly within the rated speed.

The descending torque of the motor and the increasing torque of the reducer are not equal, the reducer not only decelerates, but also amplifies the torque of the motor, and the motor cannot exceed its own maximum torque without changing the current and voltage.

Why can frequency change motor speed? Because you haven't figured out how they relate yet!

What kind of changes occur in torque and power after motor frequency conversion speed regulation.

Below the fundamental frequency, the maximum continuous output torque of the motor is the rated torque of the motor, which is the constant torque area, and the output power of the motor is less than the rated power because the speed is lower than the rated speed. Above the fundamental frequency, the speed increases, and the motor voltage cannot be greater than the rated voltage, so the maximum power that the motor can output remains unchanged, which is the rated power of the motor, at this time, because the speed is higher than the rated speed, the maximum output torque will decrease, and the higher the speed, the more the maximum torque value can be output.