Relaying control method for long-stator linear synchronous motor

Abstract

The invention discloses a relaying control method for a long-stator linear synchronous motor. The method comprises that: 1, a propulsion control system of an nth subarea fully controls a long stator, the propulsion control system of an (n+1)th subarea is on standby, and the propulsion control systems of adjacent subareas perform data synchronization by utilizing a reflective memory network; 2, the propulsion control system of the nth subarea half controls the long stator, and the propulsion control system of the (n+1)th subarea serves as an assistant; 3, the propulsion control system of the nth subarea assists in controlling the long stator, and the propulsion control system of the (n+1)th subarea half controls the long stator; and 4, the propulsion control system of the nth subarea is on standby, and the propulsion control system of the (n+1)th subarea fully controls the long stator. In the method, communication is established by adopting the reflective memory network, high speed, high real-time performance, electromagnetic interference resistance and high accuracy are ensured; the adjacent subareas synchronize data to ensure the consistency of control in the adjacent subareas; and control power is transferred step by step so as to avoid the current of a frequency converter unit being fluctuated in the transfer, ensure the continuity of propulsion forces of the propulsion control systems, maintain the stable running of a rotor and improve the system reliability.

Description

technical field [0001] The invention relates to a control technology in the field of power electronics and electric drive, in particular to a relay control method for a long stator linear synchronous motor. Background technique [0002] At present, as a new type of vehicle, long stator linear synchronous motors are used as driving devices in maglev trains, elevators, conveyor belts, etc. It has the advantages of high efficiency, strong climbing ability, and small turning radius. Linear motors are evolved from rotary motors. When the rotary motors are flattened along the radial direction, the rotary motors become linear motors. The stator core and windings are arranged along the track, and the rotor becomes a mover. The traction power supply system passes three-phase alternating current to the stator winding to generate a traveling wave magnetic field to push the mover forward. The stator of the long stator linear motor is much longer than the mover. Only the stator covered ...

AI Technical Summary

Problems solved by technology

The commonly used communication methods are field buses such as Ethernet and PROFIBUS. These methods are slow, poor in real-time performance, and are susceptible to electromagnetic interference, which cannot meet the real-time high-speed requirements of synchronous data.

If the data of adjacent partitions are not synchronized, and the transfer of partitions is completed at the moment of power supply to the stator section, the output amplitude and frequency of the inverter unit may jump at the moment of transfer due to the inconsistency of the calculations of the two traction control systems, resulting in variable The current fluctuation of the inverter will cause the overcurrent protection of the inverter in serious cases, and the fluctuation of the current will cause a sudden change in the torque of the linear motor, which will affect the speed of the mover. If the mover is a train transporting passengers, the passengers will also feel uncomfortable.

Images