Feedforward suppression of force ripple based on a simplex-optimized dither signal.

Area of Science:

• Control Engineering
• Robotics
• Mechatronics

Background:

• Iron-core permanent magnet linear motors (PMLMs) are crucial for precise motion control.
• Force ripple is a significant challenge, limiting achievable precision in PMLMs.

Purpose of the Study:

• To design and implement a feedforward dither signal to effectively reduce force ripple in PMLMs.
• To achieve smooth and precise motion control in PMLMs.

Main Methods:

• A composite control structure combining feedforward, PID feedback, and a ripple compensator (RC).
• Identification of a dither signal model using a multidimensional simplex downhill method.
• Design of control components based on a dominant linear motor model.

Main Results:

• Successful suppression of inherent force ripple in the PMLM.
• Demonstration of smooth, precise motion trajectory tracking.
• Validation of the proposed scheme through real-time experimental results.

Conclusions:

• The feedforward dither signal effectively mitigates force ripple in PMLMs.
• The proposed control scheme enables high-precision motion without compromising motor performance.
• This approach offers a practical solution for enhancing the performance of linear motors.