ABB High Voltage Induction AC Motor

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Q:The difference between three-phase AC synchronous motor and three-phase AC asynchronous motor
The stator windings of synchronous machines and induction motors are the same. The main difference is the structure of the rotorThere is a DC exciting winding on the rotor of synchronous motor, so the external excitation power supply is needed, and the current is introduced through the slip ring;The rotor of the induction motor is short circuited winding, which generates current by electromagnetic inductionAsynchronous motor has the advantages of simple, low cost, easy to install, use and maintenance. It is widely used. The disadvantages of low efficiency, low power factor of power grid and high efficiency disadvantage. Synchronous motor is a capacitive load, can improve the power factor. With large mining equipment.
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:The difference between AC motor frequency conversion speed regulation and voltage regulation speed regulation
Variable frequency speed regulation: frequency conversion speed, the square of the voltage and frequency ratio is constant, that is, the frequency modulation at the same time, voltage, speed range, high smoothness, can achieve constant torque or constant power speed regulation.Voltage regulation: smoothness is good, speed range is narrow, only applicable to fan and pump load.
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:Why asynchronous motor AC excitation, rather than DC excitation?
An induction motor is a kind of AC motor based on the air gap rotating magnetic field and the induction current in the rotor winding to generate electromagnetic torque, so as to realize the energy conversion. As the rotor winding current is induced, so there is a certain difference between its speed and synchronous speed. Asynchronous motor and synchronous motor difference: synchronous motor running normally, the revolution is fixed, not because of changes in load changes. In normal operation, the revolution of the induction motor is not fixed, but it varies slightly with the change of the load. Synchronous motors are complex circuits with reversible energy (motors and generators are interchangeable theoretically) and are used as generators
Q:Is the motor in the inverter air conditioner a direct current motor?
Inverter motor with "special AC variable frequency induction motor + inverter", the degree of automation and high production efficiency of equipment miniaturization, increase comfort, is currently replacing the traditional mechanical control and DC speed control scheme.
Q:How large AC contactor and thermal relay should be used for the motor of 3KW? There are steps to calculate better.
1, rated current = power *2, or 6A2, the selection of AC contactor, the current domestic > = rated current, usually for a minimum of 9A. The reason is why recommend you go with CJX1 0922 or CJX2 0911 9A.3 、 thermal relay is usually a current range, rated current included in the range, preferably near the middle, which is ideal.Selection of domestic products, circuit breakers, contactors and other appropriate amplification, because the quality is not reassuring.
Q:What is the difference between stepping motor and servo motor and three-phase asynchronous motor? What are the advantages of their differences?
Stepper motor principle: stepper motor is a kind of electric pulse into angular displacement of the implementation of the mechanism. Generally speaking, when the stepping driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle (and step angle) in the set direction. We can control the angular displacement by controlling the number of pulses, so as to achieve the purpose of accurate positioning. At the same time, we can control the speed and acceleration of motor rotation by controlling the pulse frequency, so as to achieve the purpose of speed regulation.Advantages: as a digital input, the motor accuracy has been greatly improved, speed and acceleration control is easy to achieve, and the control effect is better.
Q:Why is DC motor wider than AC motor? High speed regulation accuracy? How do you know?
The DC motor has the ability to keep the rated torque from the zero speed to the nominal speed, so it can perform stepless speed regulation from zero speed to rated speed (constant torque).
Q:Why don't AC motors use commutators?
Because the direct current motor changes the current direction through the commutator, the coil continues to rotateThe alternating current is always changing direction, there is no need to use the commutatorThe difference between an engine and an electric motor is that there is no power supply on the engine connected to the motor, and the motor is connected to the power supply, but it may not have no other electrical appliance

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