ABB High Voltage Induction AC Motor

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Q:Why do motors need capacitance when they start?
Only single-phase AC motors use capacitor, DC motor and three-phase AC motor are not needed.The two phase motor coil can not generate a rotating magnetic field, which must be in a coil on series capacitor, the current current branch ahead of another coil, in order to form a rotating magnetic field between the two coils, the rotation of the rotor.
Q:What is the stator voltage and current of an AC motor? And what is the current and voltage of the rotor?
160KW motor nameplate parameters: rated voltage 380V, rated current 300A, rated power 160KW. The rotor is short circuited, squirrel cage, and it is not necessary to understand its structure.
Q:What is the influence on the motor when AC motor is connected to direct current?.
First of all, the motor will not turn, and the second is to see how many volts you are connected to. If the voltage is high, the temperature of the motor will rise sharply until burned. Of course, you don't have a problem with a dry battery.
Q:What are the direct and alternating current motors used in daily life?
Batteries are usually DC motors, such as massage machines, electric shavers, electric toys, etc. most of them are AC motors. In fact, not necessarily, there are many electric motors used in the market
Q:Why should a single-phase AC motor start with a capacitor?
Because only the formation of a rotating magnetic field, the squirrel cage rotor will rotate, only increase the starting winding, but start winding must be shifted to start capacitor winding current advance main coil current of 90 degrees, the rotating magnetic field motor to rotate (motor power will start after the resection of the starting capacitor).
Q:For AC motors, when the voltage is constant, the frequency of the voltage becomes higher or lower, so what is the impact on the motor?.
The rise of the motor inductance frequency increases, suitable for high voltage, if the voltage at constant current is reduced; decrease of the power supply frequency of the motor inductance decreases for low voltage, current increases if the voltage is constant, and there may be magnetic saturation and heat and even burn.
Q:How can I change the alternating current welding machine into a DC welder?
At the output end of AC welding machine ~ ~ two terminals, one rated welding output voltage is greater than 2 times the no-load voltage, rated output welding current is greater than 2 times the output current of the rectifier.
Q:How to synchronize two ordinary AC motors?
Frequency converter is one of the motors, one to two motors synchronous operation, can use frequency converter input control terminal function, to achieve the two frequency converter frequency settings. That is, using the command and deceleration commands at the end of the increase, the use of buttons on and off signals to increase or decrease the set frequency. In order to connect the inverter, when the growth rate of the button is closed, the command signal growth end, increase the output frequency of the inverter according to the acceleration time, growth button to keep the inverter output frequency is turned off; when the deceleration button closed, deceleration command end signal, the output frequency of the frequency converter to reduce the deceleration time, deceleration button keep the output frequency of the inverter is disconnected. By using the method mentioned above, the system can be tuned and fine tuned with the relay, so that the synchronous control of multiple motors can be achieved.
Q:What about a single phase AC motor reversing?
The steering of a single AC motor has different rotating principles according to the structural differences. The following is a reference for professional data:Single phase motors are usually divided into four types: split phase, push cabinet, hood type and ordinary series excitation type. Since the structure of the four is different, the method of changing its rotation direction is also different
Q:What's the difference between direct current motor and AC motor?
The rotating principle of three phase asynchronous motorThe prerequisite of the three-phase asynchronous motor to rotate is to have a rotating magnetic field, and the stator winding of the three-phase asynchronous motor is used to generate a rotating magnetic field. We know that the voltage between the three-phase power supply phase difference is 120 degrees in phase three, a stator winding of the three-phase induction motor in the spatial direction is 120 degrees, so when in the stator windings in three-phase power, the stator winding will produce a rotating magnetic field of stator winding rotation the magnetic field, the rotor conductor (bar) will cut the revolving magnetic field lines and induced current, current in the rotor and rotating magnetic field interact to produce electromagnetic force, the electromagnetic force generated by the electromagnetic torque drive along the rotor rotating magnetic field direction of rotation. Under normal circumstances, the actual speed of the motor is lower than the rotating speed of the rotating magnetic field. For this reason, we call three-phase motor as asynchronous motor.

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