Closed Loop Control System Of VCM

VCM is linear motor, has many advantages in precision positioning system has been widely used. This closed-loop control for voice coil motor to discuss, design a high-performance voice coil motor closed-loop control system, so that it can be applied to complex high-precision position pointing device, and according to the technical requirements and targets to make adaptive adjustments to meet the application requirements.First, the article on the main object of study voice coil motor discussion, introduced the voice coil motor mechanics model and electrical model for position sensors, analyzes the differential transformer position sensor working principle, a mathematical model of the differential transformer.Secondly, the voice coil motor control strategy conducted in-depth research, analysis of the voice coil motor position loop control method, current loop and speed loop control method for controlling method, and were given a control block diagram and transfer function.Third, the introduction of the voice coil motor driving method for PWM control conducted in-depth discussion of the PWM drive method of the transfer function and the current calculation method, introduced a typical voice coil motor driver DRV201A, for differential transformer the processing circuit of the focus of the design.Finally, the combination of the various parts together,introducing the voice coil motor closed-loop control system hardware and software implementation.