Question

What are the special features of commercial motors?

Answer 1

Hint: There are different types of motors, commercial motors are one of them. Its features do not match with the feature with the electric motors. Commercial motors use electromagnets as they can be rapidly manipulated over a wide range by controlling the amount of electric current flowing. Also, the strength of the field can be altered as per our necessity. These motors are used at places where large torque is required to transfer.

Complete answer:
In commercial motors, powerful magnets are used in place of a permanent magnet. These powerful magnets are electromagnets. These magnets are used as the permanent magnets do not produce strong magnetic fields. In these motors, large torque is required to transfer, hence a strong magnetic field is required. In commercial motors, there are a greater number of turns of conducting wire in current carrying coils. More the number of turns in the coil, greater is the magnetic field. These motors have a soft iron core on which the coil is wound. This helps to increase the magnetic field and thus makes the motor more powerful. This soft core on which coil is wound along with the coil is known as an armature. The current associated with these armatures are called armature currents. These are the special features of the commercial motors.

Note:
Students should not get confused between electric motors and commercial motors. Both these motors have different properties. An electric motor, permanent magnets are used while in commercial motors, powerful magnets are used. Also, the electromagnets do not lose magnetic strength until the electric current is stopped. While, the permanent magnets lose their magnetic strength with time. Commercial motors are used in pickup trucks, box trucks, buses, taxicabs etc. While, the electric motors are used in mixers, refrigerators, washing machines etc.