ABB Low Voltage AC Motor

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Q:AC servo motors generally choose synchronous or asynchronous?
This will be based on your purpose, such as CNC machine tools feed shaft, generally use AC synchronous servo motor, spindle general use AC asynchronous motor. The same power synchronous machine is much more expensive than the asynchronous machine. If it is common use, select synchronization
Q:AC motor: use gear variable or frequency conversion?
Each has its advantages and disadvantages.The gear case, can only be very variable, only a few or dozens of fixed speed, cost, is not very high, but when the gear there is the problem of the transmission gear must be stopped, otherwise it will damage the gear structure. But one of the great advantages of gear reduction is that the power is small and the value is very small. Only mechanical structural friction losses. That is, great torque can be gained after slowing down.
Q:What are the advantages and disadvantages of AC and DC motors?
The DC motor is easier to control than the AC motor. It can be applied to a wide range of speed regulation. It can be used in power braking, but it is more complex and more complicated than the maintenance of AC motors.
Q:Common problems of AC motors
Prevention: (1) eliminating the pulsating flux and power harmonics (such as in the inverter output side with AC reactor); (2) motor design, the bearing seat and a base bearing insulation insulation cover, the outer ring of the rolling bearing and the end. 2, why can't the General Motors be used in the plateau area? The altitude has adverse effects on motor temperature rise, motor corona (high voltage motor) and commutation of DC motor. We should pay attention to the following three aspects: (1) the high altitude, the motor temperature rise, the output power is small. But when the temperature drops with the elevation, it is enough to compensate the influence of elevation on the temperature riseWhen the rated output power of the motor can be changed; (2) high voltage motor to take anti corona measures in the plateau; (3) altitude against commutation, be sure to use carbon materials. 3, why should not the motor run light load? When the motor is in light load, it will cause (1) the motor power factor is low; (2) the motor efficiency is low. Will cause waste of equipment and uneconomical operation. (1) the load is too large; (2) lack of phase; (3) the air duct is blocked; (4) the low speed running time is too long; (5) the power supply harmonic is too big.
Q:What is the reason that the single phase AC motor is turned on and off?
Check the switch first, is there any bad contact?. After the problem of the switch is removed, the power is turned on, and whether the cold state can run normally every time. If there is a phenomenon that the cold condition can not work properly, the internal circuit or winding is not working.A single-phase alternating current motor is a rotating electromagnetic machine used to realize the conversion of electrical energy and mechanical energy.
Q:How can direct current drive AC motors?
AC motor: a machine used to convert mechanical energy and alternating current energy. AC motor has become the most common motor because of the great development of AC power system. Compared to the AC motor and DC motor, because there is no commutator (see DC motor commutation), therefore has the advantages of simple structure, convenient manufacture, relatively strong, easy to make high speed motor, high voltage, high current, large capacity. The coverage of AC motor power greatly, from a few watts to several 101000 watts, even millions of kilowatts. In the early 1980s, the largest turbo generator reached 1 million 500 thousand kilowatts. The AC motor was invented by Nicola Tesla, an American scientist from Serbia.
Q:How to control the speed of AC motor
The method of increasing rotor circuit startup is applicable to wound rotor, deep groove rotor and double cage rotor. For squirrel cage rotors, this method cannot be used.When increasing the rotor resistance of an induction motor, the maximum torque of the motor will not be affected, but the maximum torque will occur, and the motor torque slip curve will be compressed along the slip axis. As the motor curve shows that the slip ratio rises first and then decreases, the starting torque of the motor will increase. But its numerical value is affected by the maximum torque of the motor.The starting modes of single-phase asynchronous motor include capacitor start, resistance start, PTC start and so on.
Q:Why does high-speed rail use AC traction motors in China?
Synchronous excitation motor, more devices, more annoying, generally used in firepower, water power plants. It can be said that the world's larger power motors (1MW or more), basically all communication. The power generation is basically synchronous, and the motor is basically asynchronous. In addition, I give you a data, the world about 70% of the power consumption of the motor, there are 70% of which is asynchronous motor.
Q:Is the 380V single-phase AC motor the same as that of the 220V AC motor?
First of all, we should understand the meaning of alternating current, that is, the line of fire. There are four lines in the alternating current power supply 380V line, one of which is the zero line. Suppose that A, B, C [phase line], D [zero line], referred to as "three-phase four wire", in the three-phase any one phase line and D line [zero line] combination is referred to as "single-phase second-line"". Three-phase four wire power also referred to as "380V", also referred to as the single-phase two-wire 220V electricity; if it is 380V should be called the motor three-phase AC motor, if 220V motor can be called single-phase AC motor, the motor wiring is of course quite different. If the three-phase AC motor is not in phase (or bad), it can not work. If the single-phase AC motor is wrongly connected to the 380V, the second phase is very dangerous, and the motor will be burned immediately.
Q:What are the similarities and differences between brushless DC motor and AC brushless motor?
The so-called brushless, no brush, is not to rely on this kind of motor brush armature current to change the polarity, and generally by the position detection device, such as Holzer, such as photoelectric encoder position detection, and then according to a control method, according to the polarity of the armature current change of position signal.

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