Correct Answer - Option 3 : Both (1) and (2)
Factors governing the selection of motor drives:
The characteristics of motors vary widely with the nature of their application and the type of duty they are expected to perform.
The following factors should be considered while selecting a drive for particular applications.
Nature of Electric supply:
Whether supply available is AC (1-ϕ or 3-ϕ) or DC (Pure DC or pulsated DC)
Nature of the drive:
Whether the motor is to drive an individual machine or a group of machines.
Nature of load:
- Whether the load requires light or heavy starting torque.
- Whether load torque increases with speed or remains constant.
- Whether load has heavy inertia, which may require a long starting time.
Electrical characteristics of the motor:
- Starting characteristics.
- Running characteristics.
- Speed control.
- Braking characteristics.
Mechanical considerations:
- Type of enclosures.
- Type of bearings.
- Transmission of drive
- Noise level
Size and rating of the motor:
- Whether the motor is to run continuously intermittently or on load cycle.
- Whether overload capacity and pull torque are sufficient.
Cost:
- Capital cost.
- Running cost.
