Design and Optimization of a Voice Coil Actuator for Precision Motion Applications

Abstract

There has been increasing attention to the use of voice coil actuators (VCAs) for precision motion applications. In this paper, a detailed design of a cylindrical VCA is presented. Different options for the overall configuration are evaluated according to various criteria and design variables are defined for the chosen configuration. After that, optimization parameters are derived to maximize the performance in a precision motion application by maximizing the acceleration and minimizing the heat dissipation. Design parameters are optimized using finite element analysis to evaluate the magnetic properties. Optimization is carried out using the bulk volume of coil, which allowed electrical properties to be later characterized via the selection of wire gauge. Calculations for evaluating resistance, inductance, current drain, and voltage supply requirements for dc and dynamic cases are presented. Magnetic field predictions and formulations used in force calculations are verified in experiments.Index Terms-Coil wire gauge, finite element analysis, optimization, precision motion systems, voice coil actuator.

Multi-Physical Design and Resonant Controller Based Trajectory Tracking of the Electromagnetically Driven Fast Tool Servo

“…The magnetic equivalent circuit (MEC) modeling can be used to find magnetic flux densities at any point in the magnetic circuit. The mathematical expressions for magnetic flux densities can be obtained by approximations with magnetic circuit elements [11,12]. An axis-symmetry cross-section view of the magnetic circuit of the designed VCM is illustrated in Fig.…”

“…With the equivalent circuit shown in Fig. 2, the magneto-motive force ( ) generated from PM can be expressed by [11,12].…”

“…(2) where = 1.47 is the remanence of the PM, and is the relative permeability of the PM material. Ignoring the reluctance of the stator and the leakage flux, the reluctance of the PM and airgap can be approximately expressed by [11,12] ℛ =…”

Multi-Physical Design and Resonant Controller Based Trajectory Tracking of the Electromagnetically Driven Fast Tool Servo

“…The magnetic equivalent circuit (MEC) modeling can be used to find magnetic flux densities at any point in the magnetic circuit. The mathematical expressions for magnetic flux densities can be obtained by approximations with magnetic circuit elements [11,12]. An axis-symmetry cross-section view of the magnetic circuit of the designed VCM is illustrated in Figure 3, where all structural parameters are represented with lumped circuit elements.…”

Finite element assessment of moving coil actuator for HVDC breaker applications

“…High controllability and bidirectional operation are other desirable attributes of these actuator technologies [15][16][17][18]. However, the extreme acceleration at which an actuator must operate in an ultra-fast application limits the usability of the moving iron and moving magnet concepts: their high moving mass has a negative effect on the actuators response time.…”