1、PDF外文：http:/ 原 文） - 1 - Control of two PM linear motors with asingle inverter: application to elevator doors Abstract This work considers the control of two PM synchronous motors using a single inverter. The standard approach to the control of a PM synchronous motor is to use a single inverter
2、 which provides independent control of the direct and quadrature voltages (and therefore of the direct and quadrature currents) of the motor. Here, an approach is presented that provides independent torque control of two PM synchronous motors using a single inverter. In this approach, the quadrature
3、 current of each motor is controlled while it is shown that the direct current is uncontrollable. Both parallel and series connections of the two motors to the single inverter are considered and it is shown how the singularity of the controller can be avoided in each case. The methodology is applied
4、 to the control of elevator doors. 1. Introduction Composed by the order of relay control system is a realization of the first elevator control method. However, to enter the nineties, with the development of science and technology and the widespread application of computer technology, the safety of
5、elevators, reliability of the increasingly high demand on the relay control weaknesses are becoming evident. Elevator control system relays the failure rate high, greatly reduces the reliability and safety of elevators, and escalators stopped often to take with the staff about th
6、e inconvenience and fear. And the event rather than taking the lift or squat at the end of the lift will not only cause damage to mechanical components, but also personal accident may occur. Programmable Logic Controller (PLC) is the first order logic control in accordance with the nee
7、ds of developed specifically for industrial environment applications to operate the electronic digital computing device. Given its advantages, 外文翻译（ 原 文） - 2 - at present, the relay control the lift has been gradually replaced by PLC control. At the same time, AC variable frequency motor speed
8、 control technology, the way the lift drag speed has been a gradual transition from DC to AC frequency converter. Thus, PLC control technology increases VVVF Elevator modern technology has become a hot industry. With the continuous development of urban construction, the increasing high-rise building
9、s, elevators and life in the national economy has a broad application. Elevator high-rise buildings as a means of transport in the vertical run of daily life has been inextricably linked with people. In fact the lift is based on external call control signals, as well as the laws of their own, such a
10、s running, and the call is random, the lift is actually a man-machine interactive control system, simple to use control or logic control order can not meet the control requirements, and therefore , elevator control system uses a random control logic. Elevator control is currently generally used in t
11、wo ways, first, the use of computer as a signal control unit, the completion of the lift signal acquisition, operation and function of the set, to achieve the lift and set the automatic scheduling function to run the election, drag the control from inverter to complete； the second control mode with
12、programmable logic controller (PLC) to replace the computer control signal sets the election. From the control and performance, these two types of methods and there is no significant difference. Most of the domestic manufacturers to choose the second approach, because the smaller scale of production
13、, their design and manufacture of high cost of computer control devices； and PLC high reliability, convenient and flexible program design, anti-interference ability, stable and reliable operation of the characteristics of Therefore, the elevator control system is now widely used to realize programma
14、ble controller. This work considers the control of two PM synchronous motors using a single inverter. The standard approach to the control of a PM synchronous motor is to use a single inverter which provides independent control of the direct and quadrature voltages (and therefore of the direc
15、t and quadrature currents) of the motor. The 外文翻译（ 原 文） - 3 - quadrature current is proportional to the motor torque and the direct current is used for field weakening. Here, an approach is presented that provides independent torque control of two PM synchronous motors using a single inverter.
16、 In this approach, the quadrature current of each motor is controlled while the direct current is uncontrollable. Such an approach was also considered in the work 6. This problem was motivated by the control of elevator doors. A conventional elevator door system has the two doors mechanically connec
17、ted to a single cable which forces the two doors to open and close together due to the mechanical coupling. Using position sensor feedback from the wall, the position of the doors is then controlled by a motor/inverter system that pushes/pulls on the cable. The objective here was to consider a diffe
18、rent system where the cable system is eliminated and each of the two doors of the elevator are actuated using a linear synchronous motor. The two motors must reliably open and close the two doors of the elevator while maintaining a stiffness in the differential direction of motion on the order of 10
19、0,000N/m to have the feel of the conventional cable driven doors. For example, in a conventional elevator door system if one door is held, the other door must stop at the same position since the doors are attached to a single cable whose stiffness is 100,000N/m. This same behavior is still desired i
20、n the new system and requires one being able to independently control each of the doors (i.e., their linear motor actuators) to maintain the stiffness. However, in order to reduce costs, the question considered here is that of being able to independently control the two linear motors using a single
21、inverter. The outline of the rest of the paper is as follows: Section 2 briefly describes the modeling of PM synchronous motors, Section 3 develops a linear PM motor model from the rotary model, presents the door model and summarizes the standard PM synchronous motor control algorithm, Section 4 considers the control of two linear PM motors using a single inverter for both the parallel and series connection. Finally, Section 5 offers some conclusions.
