Question

What are the advantages of linear stepper motors? What is the working principle of linear stepper motor? The structure and selection of linear stepper motor, what are the structural characteristics and selection methods of linear stepper motor?

Answer 1

Linear stepper motor is a high-tech product, its advantages are:

1. Fully replace DC motor speed regulation, fully replace frequency converter + frequency conversion motor speed regulation, and fully replace asynchronous motor + reducer speed regulation.

2. It has all the advantages of traditional DC motors, and at the same time cancels the carbon brush and slip ring structure.

3. It can run at low speed and high power, and can save the reducer to directly drive a large load.

4. Small size, light weight and large output.

5. Excellent torque characteristics, good torque performance at medium and low speeds, large starting torque and small starting current.

6. Stepless speed regulation, wide speed regulation range, strong overload capacity.

7. Soft start, soft stop, good braking characteristics, can eliminate the original mechanical brake or electromagnetic brake device.

8. High efficiency, the motor itself has no excitation loss and carbon brush loss, eliminating multi-stage deceleration consumption, the comprehensive power saving rate can reach 20%~60%, and only one year of power saving recovers the purchase cost.

Answer 2

The working principle of linear stepper motor is to use a screw and nut meshing, and take a certain method to prevent the screw nut from rotating relative to each other, so that the screw moves axially.

There are currently two ways to achieve this transition:

1. Build a rotor with internal thread inside the motor, and the internal thread of the rotor meshes with the screw to achieve linear motion.

2. Use the screw as the motor output shaft, and realize linear motion by meshing the screw with the external drive nut outside the motor.

Answer 3

The structural characteristics and selection methods of linear stepper motor are as follows:

Structural features:

(1) The position and speed signals during operation are not fed back to the control system.

(2) The motor output power is variable.

(3) No cumulative error, simple structure, easy to use and maintain, low manufacturing cost.

(4) The ability to drive load inertia is large, which is suitable for small and medium-sized machine tools and places where speed accuracy is not required.

Selection method:

(1) Determine the torque required by the linear stepper motor to drag the load.

(2) Determine the maximum operating speed of the linear stepper motor.