Abstract- DC motor had been used in many applications. In some applications the control of DC Motor speed is a deal breaker. These applications require a very tight speed controlling to avoid serious problems. There are various ways to control the speed of motor. The process of developing any solution to a certain problem should go through three steps. The first step is to simulate the problem and try to find the solution. The second one is to verify that your solution is really working before you try it on real-time problems. The last step is to validate your solution on real-time measurements. In this paper we studied the problem, analyzed it, and we found the solution and did simulation to check its outcomes. Our goals in this paper are to verify our solution and implement it using Field-Programmable Gate Arrays (FPGAs). FPGAs must be programmed using Hardware Description Language (HDL). Xilinx had been used to control speed the simulation done using real time measurements using FPGA for step response of the system using MATLAB/SIMUKLINK and PSIM. Index Terms—DC Motor, speed control, FPGA, modeling and simulation I. INTRODUCTION otors is very popular devices that can be used in every house, computers and cars. The principle of controlling AC motor is not different from AC motors to DC motors. DC motors are seldom used in ordinary applications because all electric supply companies furnish alternating current. However, for special applications such as in steel mills, mines and electric trains, it is advantageous to convert alternating current into direct current in order to use DC motors. The reason is that the speed/torque characteristics of dc motors are much more superior to that of AC motors. Therefore, it is not surprising to note that for industrial drives, DC motors are as popular as three-phase induction motors [1]. In this paper using and implement our solution using Field-Programmable Gate Arrays (FPGAs), where FPGAs is an integrated circuit designed to be configured by a customer or a designer using .Xilinx and Altera are the current FPGA market leaders and long-time industry rivals. Together, they control over 80 percent of the market. Both Xilinx and Altera provide free Windows and Linux design software which provides limited set of devices. Other competitors include Lattice Semiconductor, Actel, Silicon Blue Technologies , Achronix, and QuickLogic [2_3]. Manuscript received March 20, 2014 revised March 28, 2014. Ahmed Telba is working as Researcher in Electrical Engineering Department, College of Engineering, King Saud University, KSA, (corresponding author to provide phone: 966-14678800; fax: 966-14676757; e-mail: atelba@ ksu.edu.sa). II. THEORETICAL ANALYSIS AND DESIGN In this section discussing System Modeling for DC Motor Speed and Physical setup .A common actuator in control systems is the DC motor. It directly provides rotary motion and, coupled with wheels or drums and cables, can provide translational motion. The electric equivalent circuit of the armature and the free-body diagram of the rotor are shown in figure.1 [4]: The input of the system is the voltage source (V) applied to the motor's armature and will be the output is the rotational speed of the shaft( θ/dt). The rotor and shaft are assumed to be rigid. There is a viscous friction model, which is the friction torque. The friction torque is proportional to shaft angular velocity. The physical parameters involved are: (J) Moment of inertia of the rotor,(b) Motor viscous friction constant,(Ke) Electromotive force constant,(Kt) Motor torque constant,(R) Electric resistance,(L) Electric inductance,(T) Torque,(i) Armature current,(e) Back electromotive force, and ( )Angular velocity. III. SYSTEM EQUATIONS The torque generated in DC motor is proportional to the armature current and the strength of the magnetic field. Choose that the magnetic field is constant and, therefore, that the motor torque is proportional to only the armature current i by a constant factor K t as shown in the equation (1). This is referred to as an armature-controlled motor[5] . i k T t  (1) The back emf, e, is proportional to the angular velocity of the shaft by a constant factor K e . .  e k e  (2) Motor Speed Control Using FPGA Ahmed Telba Member, IAENG, Member, IEEE M Fig 1: The equivalent circuit and free-body of DC motor.[3] Proceedings of the World Congress on Engineering 2014 Vol I, WCE 2014, July 2 - 4, 2014, London, U.K. ISBN: 978-988-19252-7-5 ISSN: 2078-0958 (Print); ISSN: 2078-0966 (Online) WCE 2014