![]() ![]() The mains AC supply is provided through the on/off switch S1 to the primary winding of the isolation and step-down transformer T1. ![]() The circuit is designed to work with 12 volt DC motors having a peak current usage of below 5 amp. The next figure below shows a very simple DC motor speed controller circuit that employs a MOSFET as a high-power potentiometer (rheostat). The following images of the prototype show how it was done: Using MOSFET as a High Power Potentiometer The idea was successfully tried by one of the avid readers of this blog. Due to the incrementing forward voltage ratings of the LEDs, they gradually light up sequentially as the voltage across the motor is increased, which also indicates the speed of the motor The LEDs must have different forward voltage drop specifications, as we have for red, orange, yellow, and green LEDs. You can add LEDs parallel to the motor for getting a quick speed indication. When it comes to controlling motor speed uniformly and efficiently, a PWM based controller becomes the ideal option, here we will learn more, regarding a simple circuit to implement this operation. This happens because the difference between the gate and the source pin of the mosfet must be always around 5V, in order to enable the mosfet to conduct optimally.Īnyway, the above configuration helps to enforce a smooth speed control on the motor, and the design could be built quite cheaply. Here we can clearly see that the mosfet source pin seems to be "following" the gate and hence the name source follower. When the gate voltage is around 7V, the source pin will supply the minimum 2V to the motor causing a very slow spin on the motor, and 7V will be available across the source pin when the pot adjustment generates the full 12V across the gate of the mosfet. It implies that the source will be always 4 or 5V lagging behind the gate voltage and vary up/down with this difference, presenting a varying voltage between 2V and 7V across the motor. In the above DC motor controller design, the pot adjustment creates a varying potential difference across the gate of the mosfet, and the source pin of the mosfet simply follows the value of this potential difference and adjusts the voltage across the motor accordingly. Sensorless Control, Without Motor Back EMFĭesign#1: Mosfet based DC Motor Speed ControllerĪ very cool and easy DC motor speed controller circuit could be build using a just a single mosfet, a resistor, and a pot, as shown below:Īs can be seen the mosfet is rigged as a source follower or a common drain mode, to learn more about this configuration you may refer to this post, which discusses a BJT version, nevertheless the working principle remains the same.Precision Motor Control using a Single Op Amp.Improved Torque using CMOS PWM Speed Control.Improved Torque at Low Speed using CMOS PWM Control.Design#3: Using IC 556 for Enhanced Speed Control.Another Simple PWM DC Motor Controller Circuit.Design#2: PWM DC Motor Control with IC 555.Using MOSFET as a High Power Potentiometer.Design#1: Mosfet based DC Motor Speed Controller.With products applicable to a variety of modern pickup trucks, you can find the right parts that would fit your needs. Visit Vivid Racing to see what AMP Research has to offer. With an experienced Engineering and Design team coupled with the best craftsmen in the industry, you are sure you are getting your money’s worth. If you are in search o a high-quality product that would be able to last you for a long time, then AMP Research is the brand you are looking for. They are also ITF 16949:2016 certified which shows that they are a company committed to supplying the highest standard of products Purchase AMP Research at Vivid Racing With 55,000 square feet of facility at their disposal, they are able to design, create, and manufacture products that cater to both the OEM companies and the aftermarket industry. State-Of-The-Art FacilityĪMP Research has some of the most advanced facilities when it comes to manufacturing. The company has continuously innovated itself in creating high-quality products as they push the boundaries of product design. They create functional yet simple solutions to these problems. There are a lot of subtle but frustrating problems when owning pickup trucks. Today, they have supplied their products to multiple enthusiasts everywhere and have provided customers with the product they deserve. The company is based in Tustin California and specializes in creating step boards, bed extenders, and other offroading accessories. But only a few offer quality parts and AMP Research is one of those few. In today’s world where 4x4s and offroad vehicles are the trends, there are a lot of companies providing accessories and parts for these rigs. ![]()
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