In the first part, we understand some common starting methods of three-phase asynchronous motors, and give a simple description of direct starting and autotransformer step-down starting methods. Today, Senli Motor Xiaobian will take you to a simple understanding about itY－△Buck starting
And inverter start these two ways.
Let's start with,Three-phase asynchronous motorY－△Step-down starting, this starting mode is to change the wiring, the stator winding is first connected into a star shape when starting, so that the voltage of each phase winding is the normal operating phase voltage1/√3After starting, it is restored into a triangular connection, and the motor enters full pressure and normal operation.
The starting current of this method will be reduced to the full voltage starting1/3The starting torque is only rated1/3Therefore, this method is mostly used for light load or no-load start.
Inverter start is the application of frequency conversion technology and microelectronics technology, by changing the three-phase asynchronous motor working power frequency, to control the AC motor power control equipment.
The inverter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), brake unit, drive unit, detection unit and micro-processing unit. Adopt AC-DC-AC mode (VVVFFrequency conversion or vector control frequency conversion), the power frequency AC power supply is converted into DC power supply through the rectifier, and then the DC power supply is converted into the frequency and voltage can be controlled AC power supply to supply the motor.
Inverter generally has overheat protection, overload protection, overcurrent protection, and even some have lack of phase protection.
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