ABB High Voltage AC Motor

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Q:Why AC motor speed control system will replace DC motor speed regulation system?
Among them, space vector PWM technology has been used more and more in AC speed regulation system because of its high voltage utilization, simple control algorithm and low current harmonic
Q:Can the voltage regulating module be used as AC motor speed regulation?
Want to control motor speed, only changing voltage frequency on the stator can (with more of a V/F control, change the frequency corresponding to the change of voltage amplitude), change the voltage regulator will not only change the frequency, voltage, it will only change the motor torque (the size of the voltage will not change, otherwise it will cause the stator coil current is too large; for example, if you burn the motor) with voltage regulator voltage applied to the motor will change the speed two times, will have little change but far less than the two times. When using the voltage regulator experiment, do pay attention to the rated voltage of the motor, otherwise it may cause permanent damage to the motor!
Q:What is the low power factor of AC motor in no-load operation?
Second, the motor idling power down to the minimum (only to maintain its own idle torque), the motor internal inductive reactive little change, so that the active power to reduce the reactive power unchanged, power factors, of course, low
Q:What is the difference between AC variable frequency speed control and DC variable frequency speed regulation?
AC variable speed DC speed is widely used because the ratio of AC motor, not the principle of frequency conversion has the advantage of frequency control can only be applied to control, and the torque is unable to achieve precise control, the reason is very simple, the DC motor armature and field is coupled, are separated, such of armature current and exciting current to achieve accurate control. The AC speed control, armature current and exciting current is coupled, is unable to achieve precise control, although the frequency current vector control, which is based on the modern control theory, through the vector transformation, the armature current and exciting current coupling in AC motor solutions, in order to control, which is the principle of simulation DC speed regulation. But it is difficult to control the DC speed. Therefore, in the rolling mills, paper and other requirements of the high torque industry, DC speed control is still widespread. And only for speed control, at present, variable frequency speed regulation can be realistic DC speed control characteristics, because the advantages of AC motor is DC motor can not do.
Q:In the main circuit of AC motor, fuse can be used as short circuit protection, can it play the role of overload protection at the same time, why?
Short circuit protection: some devices can monitor abnormal conditions in the work circuit (such as short circuits). When abnormal happens, the circuit is cut off and alarm is sent to prevent further expansion of the damageA typical short circuit protection is a fuse. When the short circuit is short, the current is very high. When the fuse is blown, the circuit will be out of power.Overload protection: to prevent the main power line from overload protection caused by overheating damage and installation of overload protection equipment
Q:The difference between induction motor and induction motor
In fact, the same is true, asynchronous AC motor is the wire package after power generation magnetic field, and then the rotor will have a magnetic field, called induction magnetic field, their asynchrony, so called asynchronous AC motor
Q:Alternating current motor commutation
When the AC input is turned back, it is equivalent to the original voltage +180, just to make the original super front late and late lead, because the 360 is a cycle, so when the AC input turns back, the motor reversesYou should know that the motors will stay at the 0 torque in only 1 groups. The other set of 90 degrees difference is just at the maximum torque. This torque causes him to start
Q:What are the classifications of AC motors?
According to the principle of AC motor can be divided into synchronous and asynchronous motor two categories, there are strict correspondence between the rotating speed and the AC synchronous motor frequency, speed in operation strictly constant; asynchronous motor speed with the change of the load change slightly.
Q:How to control the speed of AC motor
How is the motor controlled?:Motor control refers to the motor start, acceleration, operation, deceleration and stop control. Depending on the type of motor and the use of the motor, there are different requirements and purposes. The motor is controlled by motor to achieve the goal of quick start, quick response, high efficiency, high torque output and high overload capacity.
Q:Does the AC motor have carbon brushes?
Yes。 Carbon brush for AC motors: carbon brushes can be used in direct current motors or AC commutator motors or slip rings as sliding contacts for introducing current

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