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1 4. DC MOTORS Almost every mechanical movement that we see around us is accomplished by an electric motor. Electric machines are a means of converting energy.

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A DC motor is any of a class of rotary electrical machines that converts direct current electrical energy into mechanical energy. The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current flow in part of the motor.

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Electrical Machine / Basic comparison between ac and dc motor. Electrical Machine. Basic comparison between ac and dc motor. September 22, 2012 sirajul Comment. The basic construction difference between ac and dc motor is that dc motor has direct conduction current supply to rotor and ac motor has inductive supply to rotor- no direct conduct. A ...

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THEORY, CONSTRUCTION, AND OPERATION 1. CHAPTER 1 PRINCIPLES OF OPERATION OF SYNCHRONOUS MACHINES The synchronous electrical generator (also called alternator) belongs to the family of electric rotating machines. Other members of the family are the direct-current (dc) motor or generator, the induction motor or generator, and a number of ...

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3 Basic concepts of Rotating Machines. Transformers have already been introduced. The transformer is a static device having primary and secondary windings. In rotating machines, there are two parts: the stator and the rotor. Rotating electrical machines are also of two types: DC and AC machines. Electrical machines are widely used. In DC ...

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Synchronous machine construction. A synchronous machine has two mechanical parts: a rotor and a stator. There are also two electrical parts to the machine: a field source and an armature winding. These basic fundamentals of an electric machine are like those for a DC machine, with one significant difference: The field source of a synchronous ...

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In order to understand the operating principle of DC motor we need to first look into its constructional feature. The very basic construction of a DC motor contains a current carrying armature which is connected to the supply end through commutator segments and brushes. The armature is placed in between north south poles of a permanent or an ...

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The first type of motor built is still in widespread use In the late 1800s, several inventors built the first working motors, which used direct current (DC) power.

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DC Generators DC EQUIPMENT CONSTRUCTION DC EQUIPMENT CONSTRUCTION Direct current machines are energy transfer devices. These machines can function as either a motor or a generator.. DC motors and generators have the same basic construction, differing primarily in the energy conversion. To better understand the operation and construction of DC machines, a few basic …

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