CrazyEngineers Archive
Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.
@Janaa karti • 08 Feb, 2014

By using what type of magnets do we bring magnetic field in ceiling fan? Is it Electro or permanent? If it s electro, then can we use permanent magnets to create a magnetic field according to motor principle?

@lal • 09 Feb, 2014 Electromagnets are used to make magnetic field in conventional ceiling fan motors. It would be more apt to say a 'rotating magnetic field'. The poles change alternately to north and south at the supply frequency. The developed rotating magnetic field will be rotating at synchronous speed.

If permanent magnets are used, then it would become a synchronous motor. The fan motor will be rotating at exactly the same speed with which the magnetic field is rotating. The whole construction of a conventional ceiling fan motor will have to be redesigned to bring in that change. And, a synchronous motor will not start automatically unlike an asynchronous motor (induction motor).
@Janaa karti • 09 Feb, 2014 thanks. and wat ll happen if we use permanent magnets in generators????? does any current induces in The generator????
@lal • 09 Feb, 2014 Of course! As far as Fleming's right hand rule isn't violated, an emf will be induced!
@Janaa karti • 09 Feb, 2014 but which s more efficient??????? how much The electro differ frm permanent magnet???
@lal • 09 Feb, 2014 It depends on usage and power output required. Even depends on compactness, sturdiness, maintenance intervals and many more.
@Kavya Burramolla • 01 Feb, 2020 • 1 like

Generally Electromagnets are used in ceiling fans for generating the magnetic flux which is used to rotate the coil and hence rotates the fan wings.

When the fan is excited with the electrical energy the Electromagnets starts rotating and the direction of the rotation of fan is same as that of the direction of rotation of magnets and the magnetic flux generated in the coil will be proportional to the input applied to the motor.

@Vinay Mishra • 01 Feb, 2020 • 2 likes

Yes, we can use permanent magnets to create magnetic field. As we know that the magnetic field is produced by an electric charge in motion So, we can say that the magnetic field of the permanent magnet is a result of the electrons within the atom spinning uniformly in the same direction. But not all the permanent magnets can be used to create a magnetic field only a few of them have the ability to sustain a magnetic field.

For example, ferrite magnet. It is a type of permanent magnet and is majorly used in applications like ceiling fans, motor, refrigerator, etc. Ferrite magnet is also known as ceramic magnet. It is made by mixing a large proportion of iron(iii) oxide with a small proportion of any metallic element (one or more).

@Durgesh Srivastava • 02 Feb, 2020

Electromagnets are used for the ceiling fan. Ceiling fan having DC motor, the current passes through a series of magnets with opposite polarity. The resistance between the magnets creates a torque which powers the rotor. 

@Venkat Sai Nakkina • 03 Feb, 2020 • 1 like

Genarally, electromagnets are used to make magnetic field in conventional ceiling fan motors. It would be more apt to say a 'rotating magnetic field'. The poles change alternately to north and south at the supply frequency. The developed rotating magnetic field will be rotating at synchronous speed.

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