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!
Check torque is not less than the original DC motor, AC motor torque (N = m) = motor rated power (W) / (2 * pi * speed /60). Motor power and frequency converter are selected accordingly
Asynchronous motor speed = (60* frequency / pole count) * slip rate.
DC motor change to AC motor, mainly for the control part of the change.1, AC control system speed, must be installed inverter, motor also choose AC inverter three-phase asynchronous motor.2, three-phase alternating current frequency is 50Hz, synthesis magnetic field synchronous speed is 50r/s, namely 3000r/min, if the motor more than one pair of magnetic poles, further analysis can also get synchronous speed.3 and 4 pole synchronous speed is 1500r/min, 6 pole synchronous speed is 1000r/min, 8 pole synchronous speed is 750r/min, and 10 pole synchronous speed is 600r/min.
