ABB Low Voltage AC Motor QABP

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Q:How can a DC motor be changed into a three-phase AC motor with good performance?
Selection of asynchronous motor, power 60kW, voltage 400V, speed of only 960 RPM selectable (6 pole), if the speed is not enough to add speed (AC motor only 1500, 1000 (960), 750, 500 and several speed; if optional) must be 1000, as long as the election with step motor, just the price is too expensive.If the power supply capacity is not enough, without speed regulation, you need to calculate the starting capacity, select the starting mode and motor.The starting modes of squirrel cage asynchronous motor include direct start and star triangle startingThe above is cheaperThe starting modes of winding asynchronous motors are resistance start and frequency sensitive variable resistance starting
Q:What is the difference between the excitation winding and armature winding of AC motor?
Only synchronous generator and synchronous motor have excitation winding and armature winding. In general, AC induction motors do not have field windings. The asynchronous motor is divided into two major categories, squirrel cage and winding. The stator winding structure is the same. The squirrel cage rotor is a squirrel cage, and the winding rotor is a coil (which can be changed by an external device to change the rotor impedance).
Q:Why asynchronous motor AC excitation, rather than DC excitation?
Synchronous motor is also a kind of AC motor. Mainly used for generators, motors can also be used, generally used for larger power, speed does not require the adjustment of production machinery, such as large water pumps, air compressors and mine fans. In recent years, due to the development of permanent magnet materials and electronic technology, micro synchronous motor has been more and more widely used. One of the characteristics of synchronous motors is the steady running speed, N and stator current frequency f1 has a strict constant relationship, that is, n=60f1/p=n0 synchronous motor speed n and rotating magnetic field speed N0 the same. The name of "synchronization" comes from here. The stator of a synchronous motor goes without saying that the general rotor coil must be energized to keep it in sync with the stator. (the rotor of the micro synchronous motor can be made of permanent magnetic steel.)Asynchronous motor is different, the stator winding energized to generate rotating magnetic field, in the rotor to generate induction current, so that the motor rotation. Structure than synchronous motor simple
Q:What's the difference between a three-phase asynchronous motor and an ordinary one?
Ordinary motor motor and variable frequency motor of variable frequency motor, it is called the main appearance is different from the ordinary motor frequency conversion motor with forced cooling centrifugal fan, which ensures good motor cooling in low frequency and high frequency, frequency range also see nameplate motor internal structure can adapt to the specific operation of high frequency operation. Ordinary motors are generally allowed to operate under or less than 50hz.
Q:Where are the low voltage AC asynchronous motors used in electric machines?
Low voltage AC asynchronous motors are the most widely used motors. They are used in all walks of life. The washing machines, electric fans and lampblack machines in the family belong to this category.
Q:How many kinds of braking modes are there in AC motors? What are the characteristics of each?
Reverse brakingWhen the motor cuts off the normal power supply, the power phase sequence of the motor stator winding is changed so that a reverse braking torque is generated
Q:AC speed regulation motor + turbo reducer instead of cam cutter + AC motor?
But this method of use is not very reliable, if the switch is broken, then it has only been turned. So this method uses a lot of reciprocating rotation of the situation. A stroke switch is arranged at both ends of the reciprocating stroke, and if the detecting switch is broken, the switch is stopped by the stroke switch after the prescribed stroke is exceeded.In addition, the mechanism of the worm is only suitable for low speed, high speed condition, due to the impact of rotary body, namely back rebound, the backlash of worm caused by tooth side collision and rebound, resulting in inaccurate positioning.In addition, the rotating disk can not be subjected to impact load when it is stationary, and this will cause the rotation of the center of the rotating body because of the poor alignment, so that the positioning is accurate.
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:Motor PWM how to speed?
PWM speed control principle of AC motor and DC motor speed control principle is different, it is not through frequency modulation to adjust the motor speed, but by adjusting the driving voltage of the pulse width, and the circuit of some energy storage elements, change the delivery to the amplitude of the armature voltage, so as to achieve the purpose of changing the speed of DC motor. Its modulation mode is amplitude modulation.
Q:What is the size of DC motor and AC motor under the same power?
The first is to determine the output power or the rated power consumption..The DC motor has low working voltage and large power consumption under the same power consumption.The AC motor has a high working voltage and a small volume under the same power consumption.If the same work force and torque are required, the DC motor is of small size.

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