【正文】 外文翻譯（ 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 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 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 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 niies, with the development of science and technology and the widespread application of puter technology, the safety of elevators, reliability of the increasingly high demand on the relay control weaknesses are being 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 the 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 ponents, but also personal accident may occur. Programmable Logic Controller (PLC) is the first order logic control in accordance with the needs of developed specifically for industrial environment applications to operate the electronic digital puting device. Given its advantages, 外文翻譯（ 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 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 bee a hot industry. With the continuous development of urban construction, the increasing highrise buildings, elevators and life in the national economy has a broad application. Elevator highrise 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 as running, and the call is random, the lift is actually a manmachine 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 two ways, first, the use of puter as a signal control unit, the pletion 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 plete。 the second control mode with programmable logic controller (PLC) to replace the puter 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, their design and manufacture of high cost of puter control devices。 and PLC high reliability, convenient and flexible program design, antiinterference ability, stable and reliable operation of the characteristics of Therefore, the elevator control system is now widely used to realize programmable 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 direct and quadrature currents) of the motor. The 外文翻譯（ 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. 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 connected 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 different 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 100,000N/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 in the new system and requires one being able to independently control each of the doors (., their linear motor actuators) to maintain the stiffness. However, in order to reduce costs, the question considered here is t