Since permanent magnet do not produce strong magnetic field it is not used in commercial electric motors.
Why do commercial motors use electromagnet and not permanent magnet?
Answer: Electromagnets are used instead of a permanent one because electomagnets are more powerful. Electromagnets provide the force that spin the motor. Other than that, an electromagnet can be rapidly manipulated over a wide range by controlling the amount of electric current.
What does the commercial electric motor constitutes give reason?
In commercial electric motors field coils are used for producing magnetic fields and not a permanent magnet. These coils become magnetized when current is passed through them. … Therefore the suitable field coil sizes are used for various commercial purposes.
Why do commercial motors use soft iron core?
Explanation: Commercial electric motors do not use (a) An electromagnet to rotate the armature (b) Effectively large number of turns of conducting wire in the current carrying coil (c) A permanent magnet to rotate the armature (d) A soft iron core on which the coil is wound. Answer: … It enhances the power of motor.
What are Commercial Motors?
A commercial motor vehicle (CMV) is any vehicle used to transport goods or passengers for the profit of an individual or business. … Commercial motor vehicles also include exceptionally heavy vehicles and those that carry large numbers of passengers.
Why does a commercial motor use large number of turns of the copper wire?
In commercial electric motors: … This increases the strength of magnetic field, which makes the motor more powerful. The coil contains a large number of turns of insulated copper wire.
What is the difference between simple motor and commercial motor?
A simple motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on a coil which rotates it continuously while in commercial motors, the coil is bound on a soft iron core which becomes magnetized and increase the length of the magnetic field …
What are the uses of commercial motor?
Answer: A commercial motor vehicle (CMV) is any vehicle used to transport goods or passengers for the profit of an individual or business. Examples of CMVs include pickup trucks, box trucks, semi-trucks, vans, coaches, buses, taxicabs, trailers and travel trailers.
What is the special feature of commercial electric motor?
Special features of commercial electric motors are: The coil is wound on a soft iron core; therefore, the strength of magnetic field increases. The coil contains large number of turns of insulated copper wire. A powerful electromagnet is used in place of permanent magnet.
What enhances the power of the motor?
The combination of soft iron core and coil is an armature. It enhances the power of motor. Thus, commercial electric motors do not use permanent magnet to rotate the armature because permanent magnets are weak and do not produce strong magnetic field in the region.
Why is iron used in an armature?
Soft iron concentrates the magnetic field but does not remain magnetized, allowing it to reverse. But AC will induce wasteful eddy currents in the armature core because the iron is a conductor and will act as a shorted turn. So the armature is made up of thin insulated laminations.
What should be the core of electromagnet?
Core of an electromagnet should be of soft iron and not of steel because soft iron loses all its magnetism when current in the coil is switched off but steel does not lose its magnetism when the current is stopped.
Under what conditions permanent electromagnet is obtained?
Answer: The conditions to obtain permanent electromagnet as following if a current carrying solenoid is used are (i) The current through the solenoid should be direct current. (ii) The rod inside is made of a magnetic material such as steel.
What are the structural changes made in commercial motor?
The power of the commercial motors is increased in the following ways: (i) Permanent magnet is replaced with electromagnet. (ii) The conducting material of the current carrying coilis manufactured with large number of coils. (iii) The coil is wound on a soft iron core.
What kind of magnets are used in commercial motors?
Which Magnets Are Used in Commercial Motors?
Permanent magnets commonly used in motors include sintered magnets and bonded magnets, like AlNiCo magnets, ferrite magnets, SmCo magnets, neodymium magnets, etc.
- AlNiCo Magnets. …
- Ferrite Magnets. …
- SmCo Magnets. …
- NdFeB Magnets.
What is commercial motor Class 10?
(A) An electromagnet in place of permanent magnet. (B) Large number of turns of the conducting wire in the current carrying coil. When a current is passed through a coil placed in a magnetic field, the coil experiences a torque in a direction given by Fleming’s left-hand rule. …