Publications

In the compact design of the trans-scale FTS, a voice coil motor and a dual-stage flexure mechanism are designed together with the armature of the VCM by which a 2-DOF (degree of freedom) reciprocating motion is developed in the diamond tool for precision manufacturing. In the dual-stage flexure mechanism, stage-1 (meso-range) is driven by a VCM, while a PEA stack is used to drive stage-2 (micro-range).

- Details of this project will be shared after the work is published.

Abstract

In this paper, a voice coil motor (VCM) actuated fast tool servo (FTS) system is developed for diamond turning. To guide motions of the VCM actuator, a crossed double parallelogram flexure mechanism is selected featuring totally symmetric structure with high lateral stiffness. To facilitate the determination of the multi-physical parameters, analytical models of both electromagnetic and mechanical systems are developed. The designed FTS with balanced stroke and natural frequency is then verified through the finite element analysis. Finally, the prototype of the VCM actuated FTS is fabricated and experimentally demonstrated to achieve a stroke of ±59.02 μm and a first natural frequency of 253 Hz. By constructing a closed-loop control using proportional–integral–derivative (PID) controller with the internal-model based resonant controller, the error for tracking a harmonic trajectory with ±10 μm amplitude and 120 Hz frequency is obtained to be ±0.2 μm, demonstrating the capability of the FTS for high accuracy trajectory tracking.

Keywords:

fast tool servo; voice coil motor; flexure mechanism; resonant controller

More Information:

• DOI: https://doi.org/10.3390/act9020028

• Weblink: https://www.mdpi.com/2076-0825/9/2/28/htm

Abstract:

Renewable energy is a widely used term in today’s world as it is pollution-free and eco-friendly, and people are focusing on alternative sources of energy that are cost-effective and can be used for a long period of time. The proposed technique discussed in this paper as a solution is based on a ratchet mechanism designed for speed breakers. The load passes over the speed breaker and transmits potential energy onto the rack and pinion arrangement. The designed mechanism depends on the flow of traffic to generate electricity, which is the loophole for transmitting load to the rack and pinion. The back-and-forth motion is responsible for the conversion of potential energy into kinetic energy, and acquiring kinetic energy is further utilized by converting it into electrical energy using a dynamo generator stored in a power bank. The AC voltage required for street lights and traffic systems is acquired using an inverter. This mechanism can be installed where the flow of traffic is high, and the higher the number of vehicles passing over it, the, more, results in maximum voltage.

Keywords:

Rack; Pinion; Ratchet Mechanism; Renewable Energy; Speed breaker

More Information

• DOI: https://doi.org/10.1016/j.egypro.2017.07.021.

• Weblink: https://www.sciencedirect.com/science/article/pii/S187661021732547X)