Intelligent Permanent Magnet Motor-Based Servo Drive System Used for Automated Tuning of Piano

Abstract

This paper presents an intelligent permanent magnet synchronous motor-based servo drive system used in automated piano tuning applications. The permanent magnet synchronous motor-based drives are able to improve the accuracy of the piano tuning process in comparison with the traditional direct-current motor-based and step motor-based servo drives. To explain the techniques, firstly, the structure and principles of the automated piano tuning devices with a surface-mounted permanent magnet synchronous motor-based drive system integrated are introduced, illustrating that it is feasible to implement the proposed piano tuning strategy. Secondly, the piano tuning devices have two functions: low-speed rotation and position holding. To ensure that the surface-mounted permanent magnet synchronous motor can rotate stably over the low-speed range with strong anti-interference capacity, a double closed-loop speed-regulation-based control scheme is employed. And to ensure high position control performance, a fuzzy-adaptive triple closed-loop position-regulation-based control scheme is employed. It terms of the control schemes, it deserves to be mentioned that main contributions include, firstly, the parameters of the proportional integral controllers in the double closed-loop speed-regulation structure is tuned relying on both stability and bandwidth analyses. Then, a fuzzy-adaptive proportional integral controller is specially-designed for the triple closed-loop position-regulation to adapt to the piano tuning applications. Simulation is conducted on a 20 rpm three-phase permanent magnet synchronous motor servo drive-based piano tuning system to validate the proposed piano tuning method and to verify the proposed control techniques.

Effect of inharmonicity on pitch perception and subjective tuning of piano tones

“…Traditionally, piano tuning has been a subjective task performed exclusively manually. However, mechanical approaches and algorithms have recently been proposed to automate the process (e.g., Tuovinen et al, 2019;Zhou et al, 2021).…”

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“…It is a history of the development of piano playing techniques from the fine finger movement playing to the use of arm and body gravity [7], from the fashionable weighted playing method formed in the early 20th century to today's training of both weighted playing method and putting finger training in an important position [8]. Today's human society is changing too fast, with rich works and everchanging acoustic colors requiring piano playing methods to be integrated and interpenetrated according to different works; learning to understand the evolution of the piano playing method is to understand the era and style of the piano from a historical perspective, knowing and respecting the spirit of the work of a good method, and ultimately, in order to play the piano well [9][10][11][12].…”