DC MOTORS.pptx
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A DC motor operates by converting electrical energy into mechanical energy. When a current-carrying conductor is placed in a magnetic field, it experiences a mechanical force according to Fleming's Left Hand Rule. This twisting force is called torque. During motoring action, torque causes the armature to rotate. During generating action, a back EMF is induced in the armature windings opposing the applied current, according to Faraday's law of induction. The document defines back EMF and provides the torque equation for a DC motor. It also lists the contents to be covered, which include the principle of operation, back EMF, and torque equation.
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A generator is a device that convert Mechanical energy into electrical energy using electromagnetic induction.
A DC generator produces direct power based on fundamental principle of Faraday's laws of electromagnetic induction.
According to this laws, Whenever a conductor is moved within a magnetic field in such a way that the conductor cuts across magnetic lines of flux, voltage is generated in the conductor.
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Fleming right hand rule (FRR) used to determine nature of emf or direction of current because rest two direction of motion of conductor in generator (Input Mechanical energy in generator) and direction of magnetic field (due to stator Field) are known.
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YOKE
It is the outermost part of a DC motor. It is made of cast iron or cast steel.
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It is a cylindrical structure with slots around its outer periphery.
It houses conductors in the slots.
It provides easy path for magnetic flux
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DC MOTORS.pptx
- 1. UNIT-II DC MOTORS MVenkatesh Assistant Professor Department of Electrical & Electronics Engineering N.B.K.R. Institute of Science and Technology Vidyanagar.
- 2. Contents: Principle of operation Back EMF Torque equation
- 3. DC MOTOR A motor is an electrical machine which converts electrical energy into mechanical energy. The principle of working of a DC motor is that "whenever a current carrying conductor is placed in a magnetic field, it experiences a mechanical force". The direction of this force is given by Flemings Left Hand Rule
- 4. WORKING PRINCIPLE: This twisting force is called as ‘TORQUE’ This action is called as ‘motoring action’ In DC motors after motoring action, generating action takes place. Due to generating action an emf is induced in motors. This emf is called as “BACK EMF”
- 5. Fleming’s Left Hand Rule
- 6. When the armature of the motor is rotating, the conductors are also cutting the magnetic flux lines and hence according to the Faraday's law of electromagnetic induction, an emf induces in the armature conductors. The direction of this induced emf is such that it opposes the armature current (Ia) . BACK EMF:
- 10. Types of Torques in the Motor Rating of the motor is in H.P
- 11. MAXIMUM POWER DEVELOPED CONDITION IN DC MOTORS The voltage equation of a DC motor is given by V = Eb + Ia Ra Multiplying both sides of the above equation by Ia we get,