Essay On Dc Motors

The equivalent electrical circuit of a dc motor is shown in figure 5.2. It can be represented by a voltage source (Va) across the coil of the armature. The electrical equivalent of the armature coil can be described by an inductance (La) in series with a resistance (Ra) in series with an induced voltage (Vc) which

TM4, the industrial partner, is a leading manufacturer and supplier of traction motors and drives for electric vehicle industry in Canada. As a drive manufacturer, they always aim to provide solution which is energy efficient with small footprint. In order to achieve this, they always look for alternative software and hardware solutions. Software modifications, which may improve the system performance in comparison to their existing drive control strategy without increasing the size of the system, are always sought after for continuous improvement of their system. In this regards, the internship is relevant to them for exploring alternative control strategies.

Brushless motors are a bit similar to normal DC motors in the way that coils and magnets are used to drive the shaft. Though the brushless motors do not have a brush on the shaft which takes care of switching the power direction in the coils, and this is why they are called brushless. Instead the brushless motors have three coils on the inner (center) of the motor, which is fixed to the mounting. On the outer side it contains a number of magnets mounted to a cylinder that is attached to the rotating shaft. So the coils are fixed which means wires can go directly to them and therefor there is no need for a brush. The reason why QuadCopters use brushless motors instead of normal DC motors is the much higher speeds and less power usage for the same speed. The brushless motors are more efficient as there is no power lost as there is in the brush-transition on the DC motors. Usually rated with a KV rating (revolutions per volt). This is not equivalent to torque, but lower KV motors are usually used for larger

The quest for an engine which having the same or more power with higher fuel efficiency than the existing ones has started before many years. As a result of all these researches a new engine concept is formed, which is a six stroke engine. Lot of research works are conducting on this topic nowadays and already six types of six stroke engines were discovered yet. Of these the resent developed three six stroke engines, i.e., Beare head, Bruce crowers and Velozeta’s are undergoing tremendous research works.

In a normal motor set-up, there are different mechanical and electronic components, for example, the admission complex, flash attachments, Mass wind stream/Volume wind stream, and so forth. Present day motors utilize the utilization of an ECM to give the best harmony in the middle of execution and emanations. Through the OBD correspondences convention, the electronically controlled parts of the motor can be altered in the process known as 'mapping'. Changing so as to map can either be performed the product inside of the ECU (chip tuning by means of firmware adjustment), or by giving false information through module equipment (piggybacking). Mechanical segments can likewise be supplanted, for example, turbochargers or

In the first chapter of this book, the authors take some time to shortly talk about Horsepower and Torque. To begin, Torque and Horsepower are directly related to each other. In this section of the book, it explains how Horsepower is not a measurable force, but is a calculated measurement of Torque. Torque on the other hand is an actual force and can be measure through a variety of ways. It can be measured through engine, chassis, or even hand held dynamometers. Likewise, Torque is a twisting force, and is expressed in Pounds feet of Torque or Newton Meters for the metric system. Furthermore, the authors explain when the term Horsepower was first used. Moreover, James Watt, an entrepreneur and engineer who lived in the early 1700’s came up

For my Independent Study project, I decided to work with Matthew Doherty to design and build a solenoid motor using Inventor and 3D printing technology. The purpose of this project was to expose us to the greater functions of 3D printing as well as a way to study electricity and the mechanical properties of engines. Because of the vast application of solenoids, specifically in automobiles, we decided that building a solenoid engine would provide us with the best model to study both electrical and mechanical design properties and functions. In prior classes, specifically Principals of Engineering and (AP) Physics, we have been exposed to basic models of engines, but we have never been able to actually

In an inner rotor style, the stator coil windings surround the rotor and are mounted to the motor's housing as shown here. The first advantage of an inner rotor construction is its ability to dissipate heat. A motor's ability to dissipate heat directly impacts its ability to provide force. For this reason, the overwhelming majority of BLDC motors use an inner rotor style. Another advantage of an inner rotor style is lower rotor inertia.

Efficiency of any machine is the quantitative relation of output power and input power. The efficiency of induction motor is determined using the equation

This report contains details from three lab experiments performed using a synchronous machine for both a motor and a generator. The fundamental principle of a synchronous machine is that the electrical frequency is related to the mechanical frequency. The first lab performed consisted of doing two different tests, the open-circuit and short-circuit tests, respectively. By performing these two basic tests, it can be determined the armature voltage and current changes drastically with each test. The second lab performed required to use the synchronous machine as a generator. When acting like a generator, it becomes necessary to

Most magnetic motors are rotary, but linear types also exist. In a rotary motor, the rotating part (usually on the inside) is called the rotor, and the stationary part is called the stator. The motor contains electromagnets that are wound on a frame. Though this frame is often called the armature, that term is often erroneously applied. Correctly, the armature is that part of

When any vehicle is moving on the road it experiences resistance due to the wind. As the vehicle moves forward, air flows along the surface of the vehicle in the opposite direction. This kinetic energy in the air can be utilized to propel the turbine, which in turn rotates the generator shaft connected to it. This test can be performed on any vehicle. Since an automobile was available at our disposal, we choose to test the setup of micro wind turbines on it. There were few studies which dealt with this concept in several other ways and none of them have actually tested out their designs. Our primary aim was to prove that electricity can be generated using micro-wind turbines on any moving vehicle. Hence, the aerodynamic performance of the car was not given much consideration during the experiment. CFD analysis

Modeling of a BLDC motor can be developed in the similar manner as a three phase synchronous machine. Since its rotor is mounted with a permanent magnet, some dynamic characteristics are different. Flux linkage from the rotor is dependent upon the magnet. Therefore, saturation of magnetic flux linkage is typical for this kind of motors. As any typical three phase motors, one structure of the BLDC motor is fed by a three phase voltage source as shown in Figure 2.10. The source is not necessary to be sinusoidal. Square wave or other wave- shape can be applied as long as the peak voltage is not exceeded the maximum voltage limit of the motor. Similarly, the model of the armature winding for the BLDC motor is expressed as follows.

The kinetic energy wasted as heat have been conserved as electrical energy in a chargeable battery and used to drive the motor in case of interruption of main supply. PI controller is employed to achieve desired speed and the absolute position of rotor can be known from Hall Effect sensors [3]. Four quadrant operations of BLDC motor can be used in small power application including rotation of spindles, embroidery machines, washing machine, fans and large power application including industry, electric locomotive and in satellite.

Nearly all shunt and compound motors of ½ hp or more have commutating poles or interpoles located between the main poles. This interpoles have one winding of heavy wire and are connected in series with the armature. The purpose of this interpole is to prevent sparking. The polarity of the interpoles depends on the polarity of the main poles aand the direction of the motor’s rotation.