Speed Regulating Motor Frequency Conversion Motor, what is the frequency conversion speed regulation

1 is not a concept, frequency conversion motor is a kind of speed regulating motor.

2. Speed regulating motor, which can be regulated by changing the number of pole pairs or frequency or variable voltage. Inverter motors do use inverters.

3. The speed control motor uses a frequency converter, so it is a frequency conversion motor. The governor of the inverter motor is the inverter device.

4. You have to ask the manufacturer whether it is frequency conversion or not, and generally the frequency conversion motor can be equipped with a reducer. With inverter, there is no need to use other governors.

However, generally speaking, the governor refers to the governor of the DC motor. If it is DC, there is no frequency conversion, and DC has no frequency. That is to say, AC power cannot be used with a DC governor.

The speed motor is added with a governor, and the frequency conversion motor is used with a frequency converter.

1.Speed control motor and frequency conversion motor are not the same concept.

2.The speed control motor is added to the governor, and the frequency conversion motor is used by the frequency converter.

3.The speed motor cannot use a frequency converter, and the frequency conversion motor cannot use a governor.

4.Nissei Motor G3L model is a geared motor that does not need to be used for speed regulation

Frequency conversion speed regulation of the motor refers to changing the speed of the motor by changing the frequency of the motor power supply, which is a speed regulation method.

The principle of frequency conversion speed regulation is: under the condition of keeping the magnetic flux of the motor unchanged, the synchronous speed n1 of the motor is changed by changing the power supply frequency f, so as to realize the speed regulation of the motor.

The basic characteristics of frequency conversion speed regulation are:

Large speed range and high precision;

It can be adjusted arbitrarily within the rated speed of the motor;

It can continuously and smoothly adjust the speed, stepless speed regulation;

The power loss is small and the efficiency is high when the speed is regulated;

The speed of the motor can be adjusted by changing the frequency of the power supply f, so that automatic control can be realized.

Mechanical speed regulation. There are three types of mechanical speed regulation methods: electromagnetic clutch, hydraulic coupling and liquid viscous clutch, among which the most used is the hydraulic coupling, that is, a hydraulic coupling device is inserted between the motor and the load in series, and the size of the coupling force between the motor and the load is adjusted by the height of the liquid level, so as to realize the speed adjustment of the load.

In the 90s of the last century, hydraulic couplers were used more in fans and pumps driven by high-voltage and large-capacity cage motors. Due to its limited speed regulation range (99% 30%), speed regulation accuracy is not high enough, low efficiency, can only be used as a stand-alone machine, and must be shut down for repair when it fails, the scope of use is very narrow, and the amount of use is also very limited.

Cascade speed regulation.

The cascade speed regulation must use a winding asynchronous motor, and a part of the energy of the rotor winding is sent back to the power grid through rectification and inverter, which is equivalent to adjusting the internal resistance of the rotor, thereby changing the slip of the motor. Because the voltage of the rotor and the voltage of the power grid are generally not equal, so a transformer is needed for inverting to the power grid, in order to save this transformer, the form of feed motor is generally adopted in the domestic market application, that is, a three-phase auxiliary winding is made on the stator, which specially accepts the feedback energy of the rotor, and the auxiliary winding also participates in the work, so that the energy absorbed by the main winding from the power grid will be reduced, so as to achieve the purpose of speed regulation and energy saving. Due to the small amount of wire-wound motors used in industrial production, the application range of cascade speed regulation mode is also narrow.

Frequency conversion speed regulation.

Frequency conversion speed regulation is to change the power supply frequency through the frequency converter, so as to realize the adjustment of the motor speed and improve the operation efficiency of the electric drive system. From the point of view of the change mode of current, the inverter can be divided into two categories: AC DC AC inverter and AC inverter.

From the perspective of the classification of voltage level, China is accustomed to call the motor with a rated voltage between 3kV and 10kv as a high-voltage bush hood motor, so the inverter developed for the motor operating in a high-voltage environment of 3kV to 10kv is generally called a high-voltage inverter, and foreign countries consider it from the perspective of transmission voltage and electricity voltage, and it is usually called a medium-voltage inverter.

From the point of view of speed regulation effect, the use of inverter speed regulation is a better speed regulation technology, and its speed regulation range is wider, which can reach 100% 5%; The speed regulation accuracy is high, and it can be reached. Since it is infinitely variable speed regulation, it can realize the soft start of the motor and the fully automatic control of the entire production system.

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The difference between the variable frequency speed motor and the ordinary motor is:1The variable frequency speed regulating motor can adjust the motor speed by adjusting the output frequency of the frequency converter, while the speed of the ordinary motor can only be achieved by changing the voltage or changing the structure of the mechanical transmission device; 2.

The variable frequency speed control motor has higher efficiency and lower energy consumption, because the motor speed can be adjusted according to the actual load demand during operation, so as to reduce energy consumption and loss; 3.The variable frequency speed motor can achieve precise control and higher stability operation, and can meet the more complex and demanding working conditions of spring; 4.Frequency conversion speed control motor has a wider range of application fields, which can be applied to wind power, water pumps, air conditioning and other industries; Ordinary motors are more suitable for transmission devices under stable working conditions.

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