Application of Stepper servo Motor System in camera detection platform

The camera detection platform is a kind of high precision detection equipment. It has the following characteristics: X-axis, Y-axis: horizontal left-right movement

Mechanical structure: lead screw + guide rail

Screw pitch: 10mm

Movement distance: 300mm

Operation requirements: accuracy within 20 m, high speed

Good motor response performance is required

Precise position is required without loss of step

Z-axis: vertical up and down movement (adjust focal length)

Mechanical structure: lead screw + guide rail

Screw pitch: 2mm

Motion distance: 30mm

Operating requirements: accuracy within 5 m, high speed

Small motor size required

Good motor response performance is required

Require the motor to stop when the absolute static, no jitter

Precise position is required without loss of step

An equipment manufacturer has considered three options

1. Stepper motor scheme

Although the traditional stepper motor has low cost, it is basically competent in the case of low speed requirements. Although it is absolutely static at rest, there is a risk of losing step.

The customer also considered installing the stepping motor into an encoder and then sending the encoder signal to the controller. Although this could solve the problem of missing step, the adjustment time was too long and the control was complex, which increased the hardware cost and software development and debugging cost.

The solution was eventually abandoned by the customer.

2. Servo motor scheme

The servo motor cost is high, but it solves the situation of losing step in high-speed operation. Since the servo motor cannot be absolutely static when stopped, it is not applicable in the focusing station.

The scheme was also abandoned by customers.

3. Stepper servo motor scheme

The stepping servo motor not only solves the problem that the stepping motor is out of step, but also solves the problem that the servo motor cannot be absolutely static. It achieves a nearly perfect effect at the focusing station and achieves the expected effect on the XY axis.

The stepper servo motor has a precision of 10000PPR and a maximum speed of 30000RPM.

The customer highly approves the stepping servo scheme, believing that it has high precision and guaranteed precision, greatly improves the speed compared with the stepping motor, and is simple to debug. It has almost no requirements for the debugging personnel or after-sales personnel, and the operation effect meets the expectation.