There are several forms of braking applicable to the usual types of electric motors. Generally, we can group all electrical braking methods into three types. Regenerative braking Dynamic or Rheostatic braking Plugging or reverse current braking Regenerative braking In the regenerative braking operation, the motor operates as a generator, while it is still connected to
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Whenever an electric drive is disconnected from the supply, the speed of the driving motor gradually decreases and becomes zero. Braking is a generic term used to describe a set of operating conditions for electric drive systems. It includes rapid stopping of the electric motor, holding the motor shaft to a specific position, maintaining the
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[sc_fs_faq html=”true” headline=”h2″ img=”” question=”Mention speed control methods of DC shunt motors?” img_alt=”” css_class=””] 1. Armature control method, 2. Field control method, 3. Voltage control method [/sc_fs_faq] The speed of a dc motor is given by [latex]N=\frac{V-I_{a} R_{a}}{Z \phi}\left(\frac{A}{P}\right) \text { (or) } \quad N=\frac{K\left(V-I_{a} R_{a}\right)}{\phi} [/latex] where V = applied voltage, Ia = armature current Ra
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There are three types of characteristics. Open circuit characteristics (OCC) or magnetisation characteristics (E2 versus If). Internal characteristics or total characteristics (E versus Ia). External characteristics or voltage regulated characteristics (V versus IL) Separately excited DC generator characteristics For a given dc generator it is clear that the induced emf is proportional to the flux
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DC generators can be classified according to their methods of field excitation. There are two types of DC generators on the basis of excitation. Separately excited DC generators Self excited DC generators Separately excited DC generators If the field winding is excited by a separate DC supply, then the generator is called separately DC generator.
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DC Generator : An electrical generator is a rotating machine which converts mechanical energy into electrical energy. It is shown in figure. This energy conversion is based on the principle of electromagnetic induction. According to Faraday’s laws of electromagnetic induction, whenever a conductor is moved in a magnetic field, dynamically induced e.m.f is produced in
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Like a four wheel vehicle, a two wheel vehicle will also be subjected to gyroscopic and centrifugal couple when it takes a turn on a curved path. Let us consider a two wheel vehicle, (say, a scooter or a motor bicycle) taking a right turn, as shown in fig. Let, m = Mass of the
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Consider any four wheel automobile (say, car) having wheels A, B, C and D, taking a turn towards left on a curved path, as shown in Fig (a). The wheels A and C are inner wheels, whereas B and D are outer wheels. While the vehicle will move in a straight line there will not
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Before discussing the gyroscopic effect on naval ships, first let us brief the terminology used in connection with the naval ship. Ship Terminology The front, top, and side views of a naval ship are shown in fig (a), (b) and (c) respectively. The terms used are: Bow: It is the fore or front end of
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We already know that the angular acceleration is the rate of change of angular velocity. It is a vector quantity and can be represented both in magnitude and direction with the help of right hand screw rule. A body rotating in a plane about a fixed axis is subjected to the angular acceleration. But whenever
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