Classification Of Drive Essay

Question: 1 Young children can sustain serious injuries from ______, which deploy even in a low speed crash.

In Paula Vogel’s “How I Learned to Drive”, we follow our protagonist nicknamed “Lil Bit” on a gut wrenching, and downright disturbing journey through her adolescence, told as a series of narrations, monologues, and flashbacks with the occasional interjection of a PSA like voice over. The play recounts the physical and emotional abuse Lil Bit encountered from the ages of eleven to eighteen at the hands of her uncle Peck, while he teaches her to drive.

Generally, an electric motor is a machine which can transform electrical energy into mechanical energy. According to the power system, we can separate electric current flow into two classifications which are “Direct Current (DC)” and “Alternating Current (AC)”. DC and AC are two different forms of electric current flow, and they are provided and stored in different ways. For example, direct current can be provided by batteries or power supplies, and alternating current can be provided by sockets or generators. Based on using different types of power systems, there are two general categories of electric motors which are DC motors and AC motors. In addition, there are many different structures and functions of stators and rotors in the motor, so engineers develop different control theories to fit specific working situations. This paper is going to explain three control techniques in three aspects, illustrating how they work, exploring their advantages and disadvantages, and their

All models are powered by a four-cylinder engine paired with a manual or automatic transmission.

1. Chain Drives - The most frequently used and typically the least expensive. Chain drives use a metal chain to run. Unfortunately the trade off is a noisy motor. Should you have a detached garage or perhaps want to hear what time your children are coming home at night this might be a good option. But if you'd rather no noise, say because there are bedrooms above the garage, the chain drive might NOT be for you.

In a hydraulic system, force applied at one point is transmitted to the other by an incompressible fluid. The fluid used is mostly an oil of some sort and the force applied is usually multiplied in order to make reduce work done. To facilitate a hydraulic system, mostly cylinders and valves are used.

For а two stroke engine, there mаy simply be аn exhаust outlet аnd fuel inlet insteаd of а vаlve system. In both types of engines there аre one or more cylinders (grey аnd green), аnd for eаch cylinder there is spаrk plug (dаrker-grey, engines only), а piston (yellow), аnd а crаnkpin (purple). А single sweep of the cylinder by the piston in аn upwаrd or downwаrd motion is known аs а stroke. The downwаrd stroke thаt occurs directly аfter the аir-fuel mix pаsses from the fuel injector to the cylinder (where it is ignited) is аlso known аs а power

High Speed Operation – A BLDC motor can operate at speeds approximately ten thousand revolutions per minute under loaded and unloaded conditions.

Our analysis is based on a sample size of fifteen jurisdictions. These cities were chosen on the basis of geographic diversity and relevance: three major cities from the Northeast, three cities from the Midwest, three cities from the South, and six cities from the West. Overall, these jurisdictions exhibit a broad range of approaches to entry management and a variety of regulatory systems. Most of these cities do not institute taxicab caps; in the sample, only six out of fifteen cities have caps.

The four stroke engines are used in lawn mowers, garden tractors, tillers, and washers. There is more than one type of four stroke engines. They are the horizontal-camshaft, side valve engine and the vertical-camshaft, side valve engine. Both of these types use four cycles four cycles in one full cycle.

AC drives are used in the industry on three phase motors. Three phase motors are highly preferable due to their high efficiency and high power outputs. The need to control these three phase motors speed, torque, and direction has led to the creation of the AC drive. AC drives come in all shapes and sizes with no two being the same. Being nonstandard the manual is necessary to properly program and wire the AC drive.

For this lab the model of the synchronous machine was already considered. The synchronous machine being used had a rating of 208-V (line-to-line rms), 60-Hz, and 200-W. It is a 4-pole machine with a synchronous speed of 1800 RPM. The open-circuit and short-circuit tests performed in this lab can

is the rotor resistor value and when the slip stays a very small value, then the s is also very small so it can be treat as a 0 value. is rotor induced EMF and it is in direct proportion to the voltage. Torque is in direct proportion to the s. Therefore, we know that torque T is also in direct proportion to . When we increase(decrease)the voltage supply, the torque will increase(decrease), therefore the speed increase(decrease). By changing the voltage supply we can achieve the speed control, this is the simplest way to control the speed. But not widely use in the real industry. Because: change a very large voltage but the speed only changes a little, the speed control range is too small. When the supply voltage has a sudden changing, the flux density in the motor, a sudden changing flus density will result a change in magnetic conditions of the motor. This result is not welcomed in the real condition of use. So changing the supply voltage is rarely used.[5][6]

Brushless DC motors is a kind of permanent magnate synchronous motor. Permanent magnet synchronous motors are classified on the basis of the wave shape of their induce emf, i.e, sinusoidal and trapezoidal. The sinusoidal type is known as permanent magnet synchronous motor (PMSM); the trapezoidal type goes under the name of PM Brushless dc (BLDC) machine. Table (2.1) shows the difference between (PMSM) and (BLDC) motor.

Abstract— The paper presents an analytic insight into the speed control of a dc Motor drive using a more stout, prompt and stabilized technique than conventionally used. The desired dynamics are difficult to achieve with conventional controllers. New techniques are attempted in the literature to get the desired performance. Here, Sliding Mode Control — a robust and non-linear control, is considered. Its understanding is simple and the performance of the whole drive system is found to be much enhanced as compared to the conventional Proportional Integral Control method. In this paper, analysis of the dc drive is done when subjected to different circumstances of speed variations as well as load variations. It is then established that the range of speed under which the drive can operate — without changing the parameters of the controllers, is much wider with the Sliding Mode Control.