Question

Which of the following descriptions of servo motors and stepper motors is correct?

A. Stepper motor is mainly used for open-loop control system, and can also be used for closed-loop control system. 

B. The three-phase stepper motor is driven by the three-phase winding according to a certain phase sequence wheel to circulate electricity.

C. AC servo motor is considered to be an ideal servo motor due to its simple structure, low cost, no brush wear and convenient maintenance.

D. The induction synchronizer can only measure the line displacement, but not the angular displacement. 

E. The point control of the machine tool is not only to achieve accurate movement from one position point to another, but also to continuously process in the process of moving and positioning.

Answer 1

The correct answer to this question is the   A, B, C  Three Options; Answer Analysis:

In option D, it is a wrong statement to describe that an inductive synchronizer can only measure line displacement; Inductive synchronizers can measure line and angular displacement.

Induction synchronizer is an electromagnetic position detection element, which can measure displacement, velocity and acceleration, with high precision, good linearity, reliable work and other advantages, commonly used in CNC machine tools, industrial robots, measuring instruments and other fields.

In the E option, the point control of the machine tool refers to the process of the machine tool running from the starting point to the end point, only controlling the X, Y, and Z axes, so that the tool moves between the two points, and does not perform machining operations.