The correct answer is: D. can index positional movement.
A stepping motor is a type of electric motor that converts electrical pulses into discrete mechanical movements. The motor has a number of electromagnets arranged in a circle around the stator, and a rotor that is made up of a number of teeth. When a pulse is applied to one of the electromagnets, the rotor turns until it aligns with the magnetic field of that electromagnet. This process is repeated for each electromagnet in the stator, causing the rotor to turn in discrete steps.
Stepping motors are often used in applications where precise positioning is required, such as in CNC machines and 3D printers. They are also used in robotics and other applications where a high degree of control over the motor’s speed and position is required.
The following are the explanations for each option:
- A. has a speed proportional to voltage input
This is not always true. The speed of a stepping motor is determined by the number of steps per revolution (SPR) of the motor and the frequency of the pulses applied to the motor. The SPR is a fixed characteristic of the motor, but the frequency of the pulses can be varied to control the speed of the motor.
- B. has a commutator
A commutator is a device that is used to reverse the current in the windings of a motor. This is necessary in order to keep the motor rotating in the same direction. Stepping motors do not have commutators, as they do not require the current in the windings to be reversed in order to rotate.
- C. is a good choice where continuous rotation is needed
Stepping motors are not a good choice for applications where continuous rotation is needed. They are designed to move in discrete steps, and they cannot rotate continuously without losing steps.
- E. None of the above
This is not the correct answer. The correct answer is D. can index positional movement.