Switched Reluctance Motor ( Srm ) Essay

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

Ten years ago our electric motor business was in real trouble. Low labor rates allowed the Eastern Bloc countries to sell standard motors at prices we were unable to match. We had become the high-cost producer in the industry. Consequently, we decided to change our strategy and become a specialty motor producer. Once we adopted our new strategy, we discovered that while our existing cost system was adequate for costing standard motors, it was giving us inaccurate information when we used it to cost specialty motors.

Hybrid cars have been around for a long time. Much longer than any of us have even thought. The first battery powered machines came way earlier, but for the hybrid cars we think of today, these models started coming out around 1888. “A vehicle is a hybrid if it utilizes more than one form of onboard energy to achieve propulsion. In practice, that means a hybrid will have a traditional internal-combustion engine and a fuel tank, as well as one or more electric motors and a battery pack.” (Edmunds) The gas is used to fuel the car but the main source of the power comes from the electric motor. There have also been companies, like Porsche, who have created hybrids that used an internal combustion engine that would turn a generator that powered an electric motor. A car with just the electric motor is not a hybrid, it’s just an electric car. Many companies have seen the growing field of hybrids cars and plan to expand their showcases with these new cars. Some of these companies include Honda, Volvo, and Cadillac.

Brushless DC motors are a vital part of the technology we use today in many different aspects of life; a common being computers. This essay will study how a brushless DC motor works, it’s pros, cons and how it compares to a brushed DC motor. Throughout will be various physics concepts and terms in order to provide the most accurate and detailed explanation.

Abstract: The area of the multiphase motor has experienced a significant growth in last decade numerous interesting development have been reported in the literature in this chain this paper is an attempt to mathematically model both three phase and six-phase induction motor for comparison of their characteristics. Using this mathematical modeling a Simulink model is created whose results shows that the six-phase induction motor can sustain more than four times the torque that can be sustained by three phase induction motor of same design parameters. The six-phase motor is better not just in torque handling capacity but it also has inherent advantages of the multiphase induction motor.

Dynamic modelling of an induction motor is used to analyze the transients’ effect in relation to the induction motor performance. For a three phase dynamic induction motor, the three phase is transformed into two phase induction motor using various transformation techniques [20]. This can be done using [21]

There are two primary synchronous machines, the synchronous generator and the synchronous motor. Both machines are very useful depending on the application necessary for their use. Depending on the external conditions, it is required to have an understanding of how the synchronous machine should be modeled for each use. The synchronous machine is commonly found in industrial settings, clocks, and power plants. The common factor between these fields is the requirement of running at a constant speed. The synchronous generators used in power plants are common because it is economically efficient to keep the generator running at a constant frequency. Depending on the application, the synchronous machines can be modeled proportionally between the mechanical frequency based on the number of poles and the frequency of current (see theory). Consequentially, the electrical radian frequency is determined be the electrical frequency. Modeling a synchronous machine is a simple task, provided the necessary parameters are known.

Today's central air conditioners offer significantly more energy efficiency than those manufactured even 5 to 10 years ago. In fact, recent model's of AC consumes up to 40% less energy, while producing the same amount of cooling. When selecting a new unit for air conditioning installation, the factors you will want to consider are energy efficiency, proper sizing, and your budget. Variable speed motors are one of your options for saving energy. Whether you need a new installation or air conditioning repair in Arlington, TX, Minuteman Heating & AC can provide the quality HVAC services you need.

This new technology has replaced many of the old ones, bringing many advantages to the user, for example DC & AC drives, soft stators, UPS, etc. Since this new technology is rapidly gaining in the modern industries, power systems are expected to provide an ideal sinusoidal waveforms for currents and voltages,

The stator current is shown in Fig. 10.a, the maximum stator current is obtained at maximum stator reactive power both lag and lead. On the other hand, the minimum stator current is obtained at stator unity power factor. On the other side, as shown in Fig. 10.b, the maximum rotor current is obtained at maximum stator lead power factor, but the minimum rotor current is obtained at stator magnetization i.e. the DFIG magnetization is achieved through the stator terminals, in this case at (Qs= 0.6 MVAR).

This project is aim to study the principle of pwm, single-phase inverter, three-phase inverter which leading to design a three-phase inverter(DC-AC) by using the mbed to control switch. This inverter will be intended to drive an induction motor which may need to drive. The work will involve simulation study of PWM generators, induction motors and device selected from.

Power electronic converters, especially DC/AC inverters have been extending their range of use in industrial application because they provide better system efficiency, reduced energy consumption and improved quality of power. The output voltage of inverter could be fixed or variable at a fixed or variable frequency and output waveforms are therefore made up of discrete values, producing fast transition

L. Hsiu et al. [34] at low output ripple and noise in voltage and current and for this design a model of coupled inductor and transformers on a common core is use that provide Zero-voltage– switched Dual–SEPIC converter with coupled inductor. H. F. Bilgin et al. [35] gave a design criteria, operating feature and characteristic of the buck type PWM rectifier employed in a unity PF dc motor drive. As per this paper single–stage UPF buck –type PWM uses For-low harmonic distortion in Ac supply current and nearly UPF over a wide operating shaft speed Range. And these output voltage and current in limit avoid any type of failure risk in current connection even for oldest motor design, aging in insulation, mechanical failure due to circulation

The brushless DC motors are becoming more popular in low and medium power applications due to the characteristics they have such as better speed versus torque characteristics, high dynamic response, high efficiency, noiseless operation and higher torque to weight ratio. They also have a long life span. With rapid development in power electronics, semiconductor and manufacturing technology for high performance magnetic materials, the brushless DC motors have been used for energy savings applications such as air conditioners, refrigerators, air pumps, kitchen appliances and electric vehicles.

This project has been carried out at the department of the electrical engineering at S.V.I.T. Vasad. It has been great opportunity to work with this project and get knowledge about this area of the power electronics.