INVT DA200A Servo for High-Speed Pick-and-Place Machines

Abstract: This article takes the practical application as an example, providing a detailed introduction to the solution based on the INVT DA200A series servo drives at the core, applied in high-speed pick-and-place machines. The solution enables fast response and stability of the equipment, with significant improvements in speed, precision, and stability.

Keywords: DA200A, pick-and-place machine, high-speed

1. Introduction

The pick-and-place machine is positioned after the dispensing or screen printing machine in the production line. It accurately places surface-mount components onto the PCB pads by moving the placement head. These machines are available in both manual and fully automatic versions. The fully automatic pick-and-place machine is designed to achieve high-speed, high-precision, and fully automated component placement, making it the most critical and complex piece of equipment in the entire SMT (Surface-Mounted Technology) production process. Pick-and-place machines are a core component in the SMT production line. Over time, they have evolved from early low-speed mechanical models into high-speed optical alignment machines and are now moving towards multifunctional, flexible, and modular designs.

* Classification by Speed:

- High-Speed Pick-and-Place Machine: The placement speed is typically above 25,000 CPH (components per hour), suitable for placing a large number of low-precision components, such as resistors and capacitors. High-speed pick-and-place machines are favored in the market for their high production efficiency and stability.

- Mid-Speed Pick-and-Place Machine: The placement speed ranges between 10,000 CPH to 25,000 CPH, suitable for placing components with medium precision requirements, such as oscillators and diodes. Mid-speed pick-and-place machines strike a balance between speed and precision, making them widely used in various electronic product manufacturing.

- Low-Speed Pick-and-Place Machine: The placement speed is below 10,000 CPH, suitable for placing components with high precision requirements. Low-speed pick-and-place machines are known for their accuracy and flexibility, making them ideal for high-precision product manufacturing.

* Classification by Structure:

- Linear Track Pick-and-Place Machine: This machine adopts a linear track structure, where the placement head moves along the X and Y axes to place components. Linear track machines are simple in design and have lower costs, but they may slightly lag behind other types in terms of speed and precision.

- Platform Pick-and-Place Machine: This type of machine uses a platform structure where the placement head and PCB remain relatively stationary, with the platform moving along the X and Y axes to achieve component placement. Platform machines offer higher speed and precision but come with higher costs and maintenance challenges.

-  Bridge-Type Pick-and-Place Machine: This machine adopts a bridge structure, with the placement head moving along the X and Y axes of the bridge. Bridge-type pick-and-place machines excel in speed, precision, and stability, but they are more costly and have higher maintenance demands, making them suitable for high-end products and large-scale production.

2. Product/Solution Introduction

Pick-and-place machine (also known as a surface-mount system) is a device based on Surface Mount Technology (SMT). It accurately places surface-mount components onto the pads of a printed circuit board (PCB), thereby simplifying manual soldering, improving production efficiency, and increasing accuracy.

* Working Process of the Pick-and-Place Machine:
- Component Identification and Grasping: The placement head uses a vacuum nozzle to pick up components based on parameters like the component package type, part number, and other specifications from the feeder.

- Visual Inspection and Alignment: The static camera performs visual processing to inspect, identify, and align the picked component to ensure its correct positioning.

- Component Placement: The placement head positions the component onto the corresponding pad on the PCB.

* Components and Their Functions:

-Main Unit: This includes the main power switch, visual display, operator display, warning lights, and emergency stop button, all of which control the power and operational status of the pick-and-place machine.
- Workhead Assembly: This component moves in the X and Y directions to pick components from feeders and place them onto the PCB.
-Vision System: This includes a movable camera, independent vision lenses, backlight components, and laser units, used for identifying marks or component positions on the PCB.
-Feeding Platform: This includes tape feeders, bulk feeders, and tube feeders, which are used to supply components to the pick-and-place machine.

- Axis Structure: This includes the X-axis and Y-axis, which control the movement of the workhead assembly and the direction of PCB conveyance.

* Product Introduction

The DA200A Series High-Performance AC Servo System is INVT's next-generation servo product. It adopts a stable technological platform, incorporates specialized direct-drive algorithms, enhances safety functions, and improves product performance, reliability, and ease of use. The DA200A Series is designed to provide exceptional value, offering competitive products and solutions to customers.

Product Features:

- Safe and Reliable: The system supports STO (Safe Torque Off) to ensure personnel safety, preventing any potential harm during operation.
- Rich Communication Options: It supports various communication protocols, including Modbus, EtherCAT, and other fieldbus technologies, making network integration convenient and reliable for industrial applications.
- Universal Drive: The DA200A series supports both direct-drive motors and rotary motors. It is compatible with multiple encoder protocols such as EnDat 2.2, Tamagawa, and BiSS-C, providing flexibility in motor and system integration.

 Pick-and-Place Machine System Diagram

3. Product advantages
3.1. Stable Operation Performance: The speed can reach 4 meters per second with an acceleration of 4g, and the accuracy is within 5 microns, achieving fast response and stability of the equipment.

3.2. Dynamic Braking to Prevent Impact: Equipped with standard dynamic braking, the system uses energy consumption braking to rapidly stop the motor in cases of emergency stop, faults, or power failure. This ensures quick stopping, preventing mechanical damage and ensuring personal safety.

3.3. Quick Inertia Recognition Response: To meet the high-speed precision requirements of the pick-and-place machine, our system offers both online and offline inertia identification modes. It automatically identifies the internal gain parameters of the system, reducing the system tuning time.

3.4. Low-Frequency Vibration Suppression to Prevent Jitter: For long lead screw structures, our advanced low-frequency vibration suppression algorithm effectively overcomes low-frequency mechanical resonance and suppresses end-arm oscillations in long cantilever mechanisms.

3.5 Notch Filter to Prevent Noise: To address the mechanical noise generated by high-gain settings in the fast response of the pick-and-place machine, our system features an automatic notch filter function. This filter significantly reduces noise and vibrations caused by mechanical structures.

4. On-site Images

5. Conclusion

Through testing, the system fully meets the customer's application requirements. The device’s functionality perfectly applies the high-response and high-precision characteristics of the DA200A servo. INVT Servo, having entered this niche market earlier and continuously optimizing its products to meet the ever-increasing industry demands, has accumulated substantial technology and experience. This has resulted in a strong reputation, making it the brand of choice for customers.