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Copy of Motion Control with Voice Coil Actuator (VCA) - CPF Plant - on Sat, 02/01/2020 - 18:34

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Description

This example shows a VCA driven motion control loop that is acting through an equivalent model of a flexible mechanical structure. This model is shown on the right side of the schematic. It was calibrated to match a physical structure, based purely on its frequency response data and using the HyperLynx complex-pole fitting technology. The original mechanical model can be seen here: https://www.systemvision.com/design/spring-mass-structural-model-and-fitted-equivalentThe top net in this schematic represents the displacement of an ideal position sensor, which provides the actual target position feedback. The loop compensation was designed by using "AC" or frequency-domain analysis of the open loop transfer function. The results are shown in the Magnitude and Phase difference plots (sensor_displacement - feedback). The loop crossover is seen to be at approximately 100 Hz, and the phase margin is just over 44 degrees. The corresponding time-domain step response is shown in the left-most waveform plot.You can see this same design and analysis using the original mechanical structural model for the "plant" here:https://www.systemvision.com/design/motion-control-voice-coil-actuator-vca-physical-plantYou can see a more detailed model of this system, that includes the Power Electronics section (i.e. a PWM controlled MOSFET H-Bridge used to drive the VCA), here: https://www.systemvision.com/design/motion-control-vca-pwm-drive

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Spring-Mass Structural Model and Fitted Equivalent

Designer19

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11 years 10 months

1,890

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Member of the PartQuest Explore Development Team. Focused on modeling and simulation of analog, mixed-signal and multi-discipline systems covering a broad range of applications, including power electronics, controls and mechatronic systems.

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Motion Control with Voice Coil Actuator (VCA) - Physical Plant

Designer19

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11 years 10 months

1,890

designs

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groups

Member of the PartQuest Explore Development Team. Focused on modeling and simulation of analog, mixed-signal and multi-discipline systems covering a broad range of applications, including power electronics, controls and mechatronic systems.

Description

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Motion Control with VCA - PWM Drive

Designer19

Member for

11 years 10 months

1,890

designs

10

groups

Member of the PartQuest Explore Development Team. Focused on modeling and simulation of analog, mixed-signal and multi-discipline systems covering a broad range of applications, including power electronics, controls and mechatronic systems.

Description

This example shows a voice coil actuator (VCA) driven motion control loop that is acting through an equivalent model of a flexible mechanical structure. This model is shown on the right side of the schematic. It was calibrated to match a physical structure, based purely on its frequency response data and using the HyperLynx complex-pole fitting technology. The original mechanical model can be seen here: https://www.systemvision.com/design/spring-mass-structural-model-and-fitted-equivalentThis version of the control system is useful when you are designing the physical implementation of the electronics (i.e. choosing properly sized Power MOSFETs, selecting an appropriate PWM switching frequency, etc.). You can use that complex-pole fitted model to assess the electronic-mechanical dynamic interactions and overall system behavior.This level of design implementation detail is typically used after the control compensation has been designed using continuous (non-switching) linearizable component models, as in this version of the system model: https://www.systemvision.com/design/motion-control-voice-coil-actuator-vca-cpf-plant

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