What is the starting mode of the motor?

The motor is the use of stator winding to produce a rotating magnetic field and act on the rotor to form a magneto-electric rotating torque, the electrical energy into mechanical energy. The motor is mainly composed of the stator and the rotor, and the direction of the power transmission in the magnetic field is related to the direction of the current and the direction of the magnetic induction.

The working principle of the motor is the role of the magnetic field on the current force, so that the motor rotation. But how many ways does the motor start?
Motor start mode includes: full pressure direct start, auto decompression start, star delta start, soft starter and inverter.
1, full pressure directly start
① in the grid capacity and load both allow full pressure direct start of the case, you can consider the use of full pressure direct start.
② the advantages of easy manipulation and control, maintenance is simple, and more economical.
③ mainly used for low-power motor starting, from the perspective of saving energy, more than 11kw motor should not use this method.

2, automatic decompression start
① use autotransformer multi-tap decompression, both to meet the needs of different load start, but also get a greater starting torque, is often used to start a larger capacity motor decompression starting mode.
② its biggest advantage is the starting torque is large, when the winding taps at 80%, the starting torque up to 64% of the direct start. And the starting torque can be adjusted by tapping.
3, star delta start
① For the normal operation of the stator winding triangular connection of the squirrel cage induction motor, if the star winding at the start of the star winding, to be completed after the completion of the triangle, you can reduce the starting current, reduce its right The impact of the grid.
② star delta start, the starting current is only the original triangular connection directly when the start of 1/3. If the starting current when starting directly to 6 to 7 times, then the star delta start, the starting current is only 2 to 2.3 times. This means that the use of star delta start, the starting torque is also reduced to the original by the triangle connection directly when starting 1/3.
③ suitable for no load or light load start the occasion. And its structure is the simplest compared to any other decompression starter.
④ star delta start mode there is an advantage, that is, when the load is too light, you can let the motor running in the star connection. At this point, the rated torque and load can match, so that the efficiency of the motor can be improved, and thus save the power consumption.
4, soft starter
① the use of thyristor phase shift voltage to achieve the principle of motor starting, mainly for the motor starting control, the starting effect is good but the cost is higher.
② fluctuations in the grid will also affect the conduction of thyristor components, especially in the same power grid when there are multiple SCR devices. So the failure rate of thyristor components is high, because it involves power electronic technology, so the maintenance of technical personnel requirements are higher.
5, inverter
① inverter is the highest technological content in the field of modern motor control, the control function is the most complete, the control effect of the best motor control device, which by changing the frequency of the grid to adjust the motor speed and torque.
② Because it involves power electronic technology, computer technology, so the cost is high, the maintenance of technical personnel requirements are high, so mainly used in the need for speed and speed control requirements of high areas.