Design and control of multispan tension simulator

In this paper, the design and control aspects of a multispan tension simulator are presented. The simulator consists of four driven rolls, including unwinder, winder, and two bridle rolls. Some relationships between design parameters and characteristics of the simulator are explained as a design guide of a multispan system. A new control algorithm of continuous load balance control is proposed for the control of speed and tension in the multispan system. The strip tension is controlled by the continuous balancing of the load torque of rolls without a tension sensor. The simulation and experimental results reveal conspicuous improvement of tension control performance by the proposed algorithm     

Maximum torque control of an induction machine in the fieldweakening region

In this paper, a new approach to the induction machine control that ensures the production of maximum torque per ampere over the entire field weakening region is presented. Considering the limitations of voltage and current, the optimal current condition for yielding the maximum torque is obtained. Also, since the onset of the field weakening operation is automatically adjusted according to the flux level, the current limit and the voltage limit, smooth and precise transition can be obtained. The proposed scheme is verified through simulation and experiment with a 5-hp laboratory induction motor drive system     

Simulation of the machining of a bush in the KOMPAS-3D system

The KOMPAS-3D CAD system includes a CAM application for turning by means of a numerically controlled module. As an example, the use of this application is considered for the machining of a bush.     

Advanced gear-shifting and clutching strategy for a parallel-hybridvehicle

In parallel-hybrid electric vehicles (HEVs), both the electric drive and the internal combustion engine provide driving torque to the wheels either separately or together. The electric drive also can be used as a generator to recharge the batteries when the engine produces more power than is needed to propel the vehicle. As a result of the battery peak power density requirement, the vehicle needs a multispeed transmission between the electric drive and the main differential. In addition, due to the load sharing between the two independent driving sources, a clutch to separate the internal combustion engine and electric drive from the drive shaft is also required. Because the shift quality is directly related to the driving comfort of the vehicle, it is important to reduce both shift shock and time. To enhance the shift quality, we have proposed the advanced gear-shifting and clutching strategy for a parallel-hybrid drive train with an automated manual transmission (AMT). By using the electronically controlled AMT, users can achieve the optimal gear shifting, with regard to the efficiency of the hybrid drive train. Owing to the speed control of the induction machine and the diesel engine at gear shifting, the synchronization is always guaranteed and it reduces the shift shock and shortens the shift time. The dynamo-based experiments have been carried out for the purpose of proving the validity of the proposed transmission and clutch control in parallel-hybrid drive trains     

Informational Relational Models for Calculating the Cutting Conditions in Automatic Control Systems

Russian Engineering Research - Stages in the automation of parameter calculations within automatic control systems for industrial processes are outlined. An informational relational model of the...     

Compensation voltage control in dynamic voltage restorers by use of feed forward and state feedback scheme

This paper discusses the control of the compensation voltages in dynamic voltage restorers (DVR). It first analyzes the power circuit of a DVR system in order to come up with appropriate control limitations and control targets for the compensation voltage control. Based on this power stage analysis, a combined feed forward and state feedback control structure for the compensation voltages of DVRs is developed. This paper also discusses the time delay problems inherent in the digital control system of a DVR. Digital control systems normally have control delay from the sampling period, the switching frequency of the inverter, the sensor transmission time, etc. The control delay increases the dimension of the system transfer function. This makes the control system more unstable. This paper analyzes the control performance related with the control delay, closed loop damping factor, and the output filter parameters in DVR systems. Based on the control system analysis, design guidelines are proposed for the control gains and the inverter switching frequency of DVRs. The proposed theory is verified by an experimental DVR system with a full digital controller.     

A new method of partial excitation for dual moving magnet linear synchronous motor

This paper presents a new partial excitation control method of the moving magnet linear synchronous motor and proposes an implementation and a control method for a dual mover linear motor. The problem of conventional partial excitation circuit is clarified and a new partial excitation control method is proposed, which is external control by a main control board. Based on this partial excitation control method, a novel control method for dual mover moving-magnet-type linear motor is proposed. The validity and performance of the proposed partial excitation control method for the linear motor is verified by experimental results. These experimental results reveal excellent position control capability such as less than 10-/spl mu/m position error within 10 ms after position command, while both movers are controlled independently.