ac motor controller with dc motor controller difference: the type of drive power supply, ac motor controller is ac, dc motor controller is dc. Ac motor controller is formed by the stator rotating magnetic field on the rotor induction electric potential after produce the rotation of power. Speed is usually fixed rotational speed. Small to household refrigerator washing machine cleaner, big to machine tools, etc. , are using ac motor controller. Dc motor stator is a fixed magnetic field of the controller, dc by the rotor's brush form changing magnetic field around it, which in the stator internal rotation. In industrial enterprises, the dc power supply is relatively reliable, dc motor controller can generally used for reliable operation of spare machinery or security; Due to the dc motor controller as the input voltage change speed can also change, so need to often speed used dc motor controller is also many, such as milling machine, planer, electric cars, the subway trains, and so on. Because communication is easy to get, easy to transport, so we currently include the use of electric machinery parts are driven ac motor controller, ac motor controller is applied more widely. Brushless dc motor controller, the stator is a rotating magnetic field, dragging the rotor magnetic field rotation. Ac synchronous motor controller, as well as the stator rotating magnetic field dragged the rotor rotating magnetic field. Stepper motor controller and ac servo motor controller performance comparison: stepping motor controller is a kind of discrete movement of the device, it has the nature of the contact and the modern digital control technology. In the current domestic digital control system, stepping motor controller application is very extensive. With the emergence of digital ac servo system, ac servo motor controller are increasingly used in the digital control system. In order to adapt to the development trend of digital control, motion control systems mostly adopt stepper motor controller or all-digital ac servo motor as executive motor controller. Although both similar on control mode (Pulse sequence and direction signal), but in the use of performance and applications on there is a big difference. A comparison to be made regarding the use performance of both. : the notion of a asynchronous motor and synchronous motor and the difference between synchronous motor controller is by the excitation current, without excitation, is asynchronous motor controller. Synchronous motor controller is by the excitation current, without excitation, is asynchronous motor controller. Excitation is added on the rotor dc system, its rotation speed and polarity and the stator is consistent, if the excitation appear problem, step motor will lose, not to be able to adjust, trigger protection field fault motor tripping, said the white point of exciting current flows is rotor synchronous motor controller of the current (With this current, make the rotor is equivalent to an electromagnet, a N pole and S pole)During normal operation, the current is produced by the external on the dc voltage on the rotor. Before this dc voltage is supplied by dc motor, now mostly by controllable silicon rectifying after supply. We usually called the silicon controlled rectifier system excitation device. Asynchronous machine speed of rotation of the motor controller to turn the son and the rotation speed of the stator rotating magnetic field generated by the inconsistencies, there is a difference,Out of sync)。 We call slip. The slip and the speed of the stator rotating magnetic field generated by the ratio of the call slip. The difference between synchronous and asynchronous machine: asynchronous machine is only in the stator voltage synchronous and asynchronous machine with the difference between said, from the aspects of power supply,Have applied voltage on the rotor), and synchronous confidential and voltage on the stator and rotor. Step that is different machine is unilateral excitation, synchronous machine is bilateral excitation. Said from the aspects of speed, the speed of the asynchronous machine is only related to the load size (Of course there are certain range),, and rotational speed of the synchronous machine is only related to the frequency of the power grid. Say from structure, synchronous motor controller and the structure of the rotor of the induction machine is different also. Asynchronous machine rotor is evening article sheet steel and aluminumOr evening of steel sheet and coil), and synchronous machine generally consists of several piece of magnet steel and coil (There is also a non-salient pole type are not quite same)Of course there are many differences, such as technical requirements, design issues and so on. Synchronization refers to the speed and power of ac motor controller frequency synchronization, and load is independent of asynchronous motor controller refers to the speed of the motor controller and the frequency of the alternating current power supply are not synchronized, associated with the load of the motor controller. Points from the application, requiring strict synchronous motor controller is designed for speed, the price is very expensive. And asynchronous motor controller is widely used in general situation, price is low.
