Variable Frequency Drivers for Permanent Magnetic Linear Synchronous Motor
The Variable Frequency Drivers for Permanent Magnetic Linear Synchronous Motor is a product designed by our company to meet the straight line pulling and carrying. It is mainly suitable for the core-free permanent magnet synchronous linear motor as the means of delivery. This product is the pioneer in the country, and it put into operation of the first magnetomotive carrying system of our country for a long term, and it has obtained critical acclaim from the long-space report by the mainstream media and the experts in the industry.
The Variable Frequency Drivers for Permanent Magnetic Linear Synchronous Motor produced by CenteRole (Dalian) Electric Transmission Technology Co., Ltd. consists of 2 parts, the rectification and contravariant: the rectification part can be selected with the one-way energy system configuration (2Q rectification, that is, passive rectification) or the bothway energy system configuration (4Q rectification, that is, active rectification), among which the 4Q rectification provides steady and constant DC supporting voltage for the contravariant party, it is neither affected by the voltage fluctuation of the power grid nor the change in the load at the contravariant side. The contravariant side can be selected with the two-level contravariant structure or three-level contravariant structure, among which the output voltage of three-level contravariant structure is less, and it is more gentle for the motor system.
In the contravariant control mode, as the long-distance character and reliability requirement of the linear carrying system, the controller adopts the sensorless magnetic field orientation control mode. There are 2 points that are worth emphasizing: 1. As there is no salient pole in the core-free permanent magnet synchronous linear motor, the magnetic field orientation under the low speed has long been the significant difficulty in the industry. While our company adopts the whole-new magnetic field orientation algorithm to solve it; 2. As the load and unload locations of the carrying system need accurate unloading, the precision of parking of products in our company can be within 2mm.
- The three-level contravariant scheme is good for reducing the du/dt, promotion of motor efficiency and extension of service life of motors. Meanwhile the output electric energy of converter is of high quality, and the content of voltage harmonic is low.
- The 4Q rectification scheme can guarantee a steady and accurate voltage of the DC bus, it will not be affected by the voltage of the power grid and the fluctuation in load, and can guarantee the quality of contravariant voltage.
- When faced with the non-salient pole permanent magnet spinning motor, the advanced non-spinning transformer magnetic field algorithm can still trace the accurate direction of the magnetic field and guarantee that the decoupling of the vector control algorithm is accurate.
- Can conveniently realize the dilatation of converter.
- The system has reliable software and hardware protection configuration through long term of engineering operation tests, and it can effectively protect the safety and reliability of the use.
- The whole converter is of compact structure and high power density.
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