【正文】 control even before it was constructed. For instance, the simulations have helped to establish that the system should not be started up with a duty cycle above 50%. 重慶交通大學二 O一二 屆畢業(yè)設計（論文） ?譯文 The overall experience with the methodology presented is that it has helped reducing development time and costs substantially. The simulations, when bined with experimental work, even supplied the lack of certain specialized instrumentation, like dynamometers. They also enabled the monitoring of inaccessible variables like the electromotive force. A remarkable fact is that not a single power electronic device was burned during this project. Finally, ongoing work is in the development of a full Hbridge speed control, as well as on applications of this to DC motors of different dimensions where the ABM model provided here may have to be modified to include additional features, like viscous friction, hysteresis and the frequency dependence of wound inductance. 文章來源： 。s web information site. Before its physical implementation, the speed control SPICE model was tested along with the ABM motor model. This permitted the debugging and finetuning of the preliminary design even before its implementation. 4. Conclusions A methodology for developing plex electronic– electromechanical prototypes has been presented in this paper. It consists essentially in bining puter simulations with laboratory tests. This methodology has been further applied in the development of a speed control for an 1 hp DC series motor. The simulation tools adopted here are PSPICE from OrCAD and its ABM utilities. While PSPICE has permitted a detailed representation of the electronics and power electronics modules which include manufacturers39。s rotor and shaft inertia. The magic flux and the windings current are related through the machine39。s position, customarily is referred to as speed control. Such a system can be either in closed or in open loop configuration [8]. While closed loop systems are required for high accuracy applications, there are many situations for which an open loop system will suffice. This paper is concerned with the latter ones. A typical DC motor speed control often has its internal signals generated and processed by analog circuitry and has its power driving stage made of several MOSFET modules in parallel [1]. This typical control can be improved by replacing or plementing its analog functions with digital ones and, in addition, by substituting each paralleled arrangement of MOSFETs with a single IGBT module [9]. The improved control would thus result more reliable, less costly and much simpler to produce. An open loop digital speed control based on IGBTs is thus proposed and developed here. The main purpose of this paper nevertheless is to present the methodology being employed by these authors for developing a working prototype of the proposed speed control. Mechatronic prototypes usually are implemented by a trial and error process which, most of the time, ends up being very expensive and time consuming. It is proposed here that this drawback can be alleviated substantially by properly 重慶交通大學二 O一二 屆畢業(yè)設計（論文） ?譯文 bining puter simulations and laboratory tests. The conjunct simulation of an electric motor and its speed control has been done before by applying very simple models for the motor and/or for the electronic control modules [1], [8] and [12]. 2. Proposed design for a DC motor speed control Current digital technologies provide several clear advantages over the analog ones for the functions of generating the PWM switching si