If the connection of the three-phase asynchronous motor is star-shaped, then the actual voltage is the phase voltage220vIf it's angular then the line voltage is380vObviously the phase voltage is lower than the line voltage. Here is a small series with Senli motor to understand the next.

       whenThree-phase asynchronous motorWhen starting, it is connected into a star to reduce the voltage, so as to ensure that the opening current is not too high, the motor just started when the current is very high, too high current will cause adverse effects on the power grid, and then affect the normal operation of other electrical;

       whenThree-phase AC asynchronous motorAfter normal operation, the current becomes very small, at this time, it is changed into a triangular type to increase its voltage, which can improve his torque (that is, make the motor more powerful).

       Star triangle starting, a step-down starting, is achieved at the cost of vehicle power in exchange for reducing the starting current. Therefore, it can not be all round, the size of the motor power to determine whether the star triangle needs to be started, but also to see what kind of load is, generally when the load is light, the load can still be started by the star triangle during operation.

       Under normal circumstances, the starting current of the squirrel cage motor is the running current5-7Times, and the voltage requirements for the grid are generally positive or negative10%.

       In order not to form an excessive impact on the grid voltage, the star triangle is used to start, and the power of the squirrel cage motor is generally required to exceed the rated power of the transformer10%When the star triangle is used to start. onlyA squirrel cage motor is only started by a star triangle.

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