Advantages of linear stepping motor (compared with traditional stepping motor)
(1) High speed responsiveness
Generally speaking, the dynamic response time of mechanical transmission parts is several orders of magnitude larger than that of electrical components. Because some mechanical transmission parts with large response time constant such as lead screw are cancelled in the system, the dynamic response performance of the whole closed-loop control system is greatly improved and the response is extremely sensitive and fast.
(2) High accuracy
Due to the cancellation of mechanical transmission mechanisms such as lead screw, the tracking error caused by the lag of transmission system during interpolation is reduced. Through the linear position detection feedback control, the positioning accuracy of the machine tool can be greatly improved.
(3) High transmission stiffness and stable thrust
"Direct drive" improves its transmission stiffness. At the same time, the layout of the linear motor can be arranged according to the shape structure of the guide rail of the machine tool and the stress condition when the workbench moves. It is usually designed to be evenly distributed and symmetrical to make its motion thrust stable.
(4) Fast speed and short acceleration and deceleration process
Linear stepping motor was first mainly used in maglev train (speed up to 500km / h). Now it is used in machine tool feed drive. Of course, there is no problem to meet the maximum feed speed of ultra-high speed cutting (required to be 60 ~ 100M / min or higher). Due to the high-speed response of "zero transmission", the acceleration and deceleration process is greatly shortened, so that it can reach high speed instantly when starting and stop instantly when running at high speed. The acceleration can generally reach 2 ~ 10g (g = 9.8m / S2).
(5) Unlimited stroke length
By connecting the fixed parts of the linear stepping motor in series on the guide rail, the stroke length of the moving parts can be extended infinitely.
(6) Low noise during operation
Because the mechanical friction of transmission lead screw and other parts is eliminated, and the guide rail pair can adopt rolling guide rail or magnetic pad suspension guide rail (without mechanical contact), the motion noise is greatly reduced.
(7) High efficiency
Because there is no intermediate transmission link, the energy loss during mechanical friction is eliminated.
This paper analyzes the working principle of linear stepping motor
Application field of linear stepping motor
Linear stepping motor is widely used in many fields with high precision requirements, such as manufacturing, precision calibration, precision fluid measurement, accurate position movement and so on.