ABB High Voltage AC Motor

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Q:How to change DC motor to AC motor?
DC motor to AC motor, single motor is good to change, as long as the power and speed approximate. The key is to change the control, DC speed control device to be replaced by AC control system, especially if you want to speed, you must install the inverter, the motor also choose AC inverter three-phase asynchronous motor.You mentioned the 2200rpm, I do not know whether the rated speed or actual use speed, DC motor should have rated speed and weak magnetic speed of two gears. If you are 2200rpm rated, about 45 kW AC machine to choose 4 pole motor, 4 pole motor rated speed is 1500rpm (50Hz), need to increase the frequency, we must choose the variable frequency motor, variable frequency motor 50Hz under constant torque, constant power 50~100Hz, should be able to meet the needs of equipment.As for the Japanese motor, which sell, it is difficult to say. Even if you can buy it, it should be sky high. If there are no special requirements, it can be changed into a three-phase asynchronous motor made in china. Should fully meet the electrical requirements.I've done a lot of imported motor localization project, Japan also had many alternative motors, such as MITSUBISHI, Hitachi, Yaskawa and so on, the German motor can use domestic alternatives, not to mention the small Japanese!
Q:Which price is higher, AC motor or direct current motor? Which one has a longer service life?
1, under the premise of the same capacity, because the DC motor sales volume is small, copper is used more, so the price is more expensive than the AC motor;2 because of brush DC motor needs to be replaced frequently, if included in the life, the working life of DC motor AC motor is short, if not included in the replacement of the working life of two kinds of brush, the service life of the motor is basically the same
Q:Comparison of AC motor and direct current motor
Disadvantages of DC motor1. direct current motor manufacturing is more expensive2. carbon brush
Q:Why are DC motors more powerful than AC motors of the same power?
Because the motor armature circuit resistance and inductance are small, and the rotating body has certain mechanical inertia, so when the motor is switched on, starting the beginning of the armature speed and anti electromotive force of the corresponding small starting current, large. Up to 15~20 times the rated current. This current will disturb the power grid, the unit will be subjected to mechanical shocks, and the commutator will spark. Therefore, the direct closing start is only applicable to motors with power not greater than 4 kW (starting current is 6~8 times the rated current).
Q:How do I change the speed of the motor?
Three phase asynchronous motor speed formula is: n=60f/p (1-s) 1, do not change the synchronous speed control method. Winding motor speed control, chopper speed regulation, cascade speed regulation, and application of electromagnetic slip clutch, hydraulic coupling, oil film clutch and so on. 2. Change the speed regulation method of synchronous speed. Change the stator pole count of multi speed motor, change the stator voltage and frequency variable frequency speed regulation, there can be no commutation motor speed regulation, etc..
Q:Alternating current motor commutation
A sinusoidal voltage with a lead of 90 degrees or a phase of 90 degrees after a large capacitor is generatedAnd the original voltage can form a set of voltage difference of 90 degrees phase,.2 group voltage together can control its directionIf it's 90 degrees ahead, it's turning right. Then it will be reversed after 90 degrees
Q:How does the PLC control the speed of the motor?
See what you choose the motor, the general AC motor does not need PLC, you can use the frequency converter speed, how much speed you can change the frequency of inverter output current. If it is a stepping motor or a private server, a drive is needed, and a PLC is used to send a pulse control drive to drive the motor. PLC each sends a pulse, the motor turns an angle.
Q:How do ordinary AC motors brake?
Usually using one-way braking, braking, braking (single-phase bridge and three-phase half wave rectifier capacitance), electromagnetic braking, braking, self excitation generator - short power-off brake and short braking
Q:What are the advantages of a DC motor and an AC motor?
An AC motor is 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 with the direct current motor, the AC motor has no commutator, so the structure is simple, the manufacture is convenient, the utility model is firm, and the motor with high rotating speed, high voltage, large current and large capacity is easy to be made. AC motors have a large range of power. AC motors are usually divided into AC generators, AC motors and synchronous regulators according to their functions. The precision spindle n AC reversible Henglin motor working state, the same motor can be used as a generator and motor. It is not very precise to divide the motor into generator and motor, but some motors are mainly used as generator, some motors are mainly motor operated.
Q:How to speed the AC motor?
There are about three speed regulation methodsOne is to use the frequency converter to change the frequency of the power supply.The two is to change the number of poles of the motor (the motor itself has the conditions).Three is the slip speed regulator. This method is not to change the motor speed. Instead, it changes the clutch of the slip clutch that is connected with the motor shaft, and changes the speed of the clutch output shaft to adjust speed.

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