Electrical Braking of DC Motor

Electrical Braking is usually employed in applications to stop a unit driven by motors in an exact position or to have the speed of the driven unit suitably controlled during its deceleration. Electrical braking is used in applications where frequent, quick, accurate or emergency stops are required. Electrical Braking allows smooth stops without any inconvenience …

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NOT Operation

Like OR and AND operation, the NOT Operation is also an important function in the digital electronic circuit. It is denoted by a bar. The binary not operation is also known as not function or complement function or bit invert function. The not operation has only one input and one output. The input and output …

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OR Operation

The OR Operation is also one of the functions in a digital logic circuit. It is represented by a plus (+) sign. For example: x + y = z which is read as “x or y is equal to z”. The truth table for the OR operation is shown in the table below: The truth …

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AND Operation

The three Binary Operations are AND Operation, OR and NOT Operation. A binary logic deals with variables having distinct values like true or false, yes or no, hot or cold, high or low, etc. In a digital system design, assigning the values 1 or 0 to these two values of the variables because digital algebraic …

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Plugging or Reverse Current Braking

In Plugging or Reverse Current Braking the armature terminals or the supply polarity of a separately excited or shunt motor when running are reversed. Therefore, in plugging the supply voltage V and the induced voltage Eb which is also called back EMF will act in the same direction. Thus, during plugging the effective voltage across …

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Swinburne’s Test

Swinburne’s Test is an indirect method of testing of DC machines. In this method, the losses are measured separately and the efficiency at any desired load is predetermined. Machines are tested for finding out losses, efficiency and temperature rise. For small machines direct loading test is performed. For large shunt machines, indirect methods are used …

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Regenerative Braking

In Regenerative Braking, the power or energy of the driven machinery which is in kinetic form is returned back to the power supply mains. This type of braking is possible when the driven load or machinery forces the motor to run at a speed higher than the no-load speed with a constant excitation. Contents: Applications …

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