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Three-phase asynchronous motor starting mode
2026-02-04
1、Direct start
However, the current of three-phase asynchronous motor can reach 6-7 times of the rated current during direct starting, which is a big impact on the power grid, especially for high-power motors.
2、Frequency sensitive resistance starting
Frequency-sensitive resistance starting refers to series connection of frequency-sensitive resistor in the main circuit when the motor is starting, so as to reduce the starting current. Frequency sensitive resistance can change the starting current smoothly, the impact on the power grid is smaller, is the more ideal way to start. However, high-power frequency sensitive resistors are used in the form of inductance, so in use will produce a large electromagnetic eddy current, which will reduce the power factor of the power grid.
3、Bucking voltage starting
The main types of reduced voltage starting are thermal autocoupled reduced voltage starting and star-delta reduced voltage starting.
The main types of reduced voltage starting are thermal autocoupled reduced voltage starting and star-delta reduced voltage starting.
Star-delta buck starting refers to a method of changing the starting voltage by changing the wiring of the motor, thus reducing the starting current, which can only be applied to motors whose normal wiring method is delta connection. In starting, use the relay method to make the motor wiring for star, at this time the motor voltage per phase is reduced to one-third of the original root, the motor speed reaches about 80% of the rated speed, the control relay to change the motor wiring for delta, the motor starts to run normally. Advantage is that it can save the autotransformer, reduce costs, while the wiring method is simple, greater reliability. The disadvantage is that it is not possible to change the ratio of the starting voltage, and at the same time, it is not possible to use the motor in the star connection.
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02-04
Three-phase asynchronous motor starting mode
Frequency-sensitive resistance starting refers to the series connection of frequency-sensitive resistance in the main circuit when the motor starts, so as to reduce the starting current. Frequency sensitive resistance can smoothly change the starting current, the impact on the power grid is smaller, is more ideal starting method. However, high-power frequency sensitive resistors are used in the form of inductance, so in use will produce a large electromagnetic eddy current, which will reduce the power factor of the power grid.
02-04
Explosion-proof motor energy saving measures
How can explosion-proof motors reduce energy consumption, save power and play a benefit in production? It should be considered comprehensively from the following aspects.
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What are the characteristics of permanent magnet direct drive motors?
Conventional motors rotate at high speeds and produce beeping sounds, and belts can become eccentric if used for too long. The permanent magnet direct drive motor can avoid these troubles and realize 1:1 transmission between equipment and motor, which makes the equipment compact, less noisy, more environmentally friendly and more professional. Direct drives are suitable for applications requiring low speeds, speed regulation and heavy loads. The main benefits of the improvement include quietness, energy saving, stability, strong power and intelligent transformation. So, the direct drive will bring you a better quality of life.
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Short-time high overload permanent magnet synchronous motor electromagnetic heat research
With the development of all-electric technology, electric rudder is widely used in aerospace, military applications and other fields. The rudder system motor requires high power density, high dynamic response and high reliability. Permanent magnet synchronous motors are widely used in rudder servo systems because of their simple structure, high torque density, high power density and high efficiency.
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