Flat linear induction motor driven stereo parking garage solution based on B&R control system
Abstract: The development of a new type of automated three-dimensional parking garage using advanced linear motor drive technology plays a key role in improving the ground utilization rate and access speed of parking, reducing the failure rate of the three-dimensional parking system and improving its reliability. This paper introduces the flat linear induction motor driven stereo parking garage solution based on B&R industrial control system. Firstly, the basic principle of three-phase flat single-sided linear induction motor drive and the arrangement of three-dimensional parking garage and electromechanical equipment are discussed. The composition, main functions and features of the automatic control system of the three-dimensional parking garage and the translation and lifting drive of the vehicle flat panel are summarized. Finally, the advantages of the linear motor driven stereo parking scheme are summarized.
With the development of society and the improvement of people's living standards, the number of private cars in China has increased sharply, the available space of cities has expanded slowly, and the problem of parking difficulties has become increasingly prominent, which has become an important factor affecting the lives of citizens.
At present, some cities in countries with large population density in foreign countries, such as Tokyo and Singapore City, have a large number of automated three-dimensional parking facilities in the center of the city, alongside large public facilities and some high-rise residential areas. Although the access to the car is highly automated, the traditional electromechanical type is used.
Nowadays, many large cities in China also have three-dimensional parking buildings, most of which are self-driving multi-storey parking buildings. It is impossible to talk about control. A few automatic parking buildings are almost all traditional electromechanical, mainly adopting “elevator storage” and "Waterwheel type".
Traditional electromechanical solutions have large power consumption (such as "waterwheel type"), some have complex mechanical structures, and high equipment failure rates, so it is difficult to ensure normal use (such as "elevator storage"). Therefore, a new type of automated three-dimensional parking garage using advanced flat single-sided linear induction motor drive technology is developed to improve the ground utilization rate and access speed of parking, reduce the failure rate of the three-dimensional parking system, and improve its reliability. Key role.
1 translational drive principle of linear induction motor
Linear Induction Motors (LIM) is a transmission that converts electrical energy directly into linear motion mechanical energy without the need for an intermediate conversion mechanism. Think of it as a straight line of a rotating machine that is cut radially and then spread along the circumference of the motor. The working principle of the linear induction motor is similar to that of the rotary induction motor. When the primary three-phase winding of the linear induction motor is excited by the alternating current, a traveling wave magnetic field is generated in the air gap, and the secondary is induced by the traveling wave magnetic field. The electromotive force is generated and a current is generated. The interaction of the air gap magnetic field with the secondary current produces an electromagnetic thrust under which the relative motion between the primary and secondary occurs. If the primary is fixed, the secondary will move linearly along the direction of the traveling wave magnetic field; conversely, if the secondary is fixed, the primary will move in the opposite direction of the traveling wave magnetic field [1].
When the magnetic directions of the two longitudinal primary blocks of a parking unit are the same and the magnetic fields of the horizontal primary blocks are opposite, the secondary block (carrier) of the parking unit is loaded with a certain self-suspending force. The car moves forward or backward. If the excitation of the four primary blocks in the second position adjacent to its front (rear) is consistent with it, the secondary block (carrier) continues to advance (or retreat) to a position, The longitudinal translational motion law can be deduced; when the magnetic field directions of the two longitudinal blocks of the parking unit are opposite and the magnetic fields of the two horizontal blocks are the same, the secondary plate is biased to the left while receiving a certain self-suspending force. Or moving to the right, if the excitation condition of the four primary blocks in the second position adjacent to its left (right) is consistent with it, the secondary plate continues to move left (or right) by one position, and its lateral translational motion law Such a push; the program of the PLC controls the excitation sequence of the primary block of the parking unit and the direction of the rotating magnetic field, and adjusts the moving speed of the secondary block by changing the frequency of the exciting current of the primary block winding, ie The sub-plate by setting the desired course and speed translated to the specified location.
Through the control of the PLC program and the translation and vertical drive, the car to be stored can be transported from the storage entrance to a designated parking space in a short period of time, and the car to be taken out can be quickly removed from the library. Take out a parking location. The above scheme is also applicable to cargo access in a three-dimensional warehouse.
The entire parking system is controlled by a PLC-based control system. The flat unilateral linear induction motor, frequency converter and position detection switch ensure precise movement of the vehicle slab. The sensor provides continuous operation data on system status and position. Easy to control and monitor.
