Mechatronics | PartQuest™ Explore

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This example shows a concept development phase version of a fan speed control loop. It uses a PID-based (Proportional, Integral and Derivative) control strategy, with continuous block-diagram representation for both the controller and the voltage drive for the DC motor. The motor, which is characterized to represent an FRC (First Robotics Competition) CIM Motor, and the attached mechanical fan load, use a conservation-based modeling approach. Both the static and dynamic interaction characteristics “emerge” naturally from the model, simply because they are “connected” on the schematic. This approach to system modeling is much like assembling a hardware prototype, and does not require the user to develop an analytical model of the “plant” being controlled. Additional external electrical circuit components, mechanical loads and other “physical” elements can easily be added by simply placing them on the schematic and “wiring” them together. In fact, a more detailed implementation of the motor drive is shown in the companion example, “PID Speed Control Loop – Switching”. In that example, a design for the logic and power electronics needed to implement a PWM-based, switched MOSFET H-bridge drive is included.Because this version simulates very quickly compared to the switching version, it is well suited for early concept validation of the control strategy and PID tuning, loop stability and frequency response analysis, etc.

PID Speed Control Loop - Continuous crane base + friction ramp

Designer172616

Member for

7 years 10 months

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Description

This example shows a concept development phase version of a fan speed control loop. It uses a PID-based (Proportional, Integral and Derivative) control strategy, with continuous block-diagram representation for both the controller and the voltage drive for the DC motor. The motor, which is characterized to represent an FRC (First Robotics Competition) CIM Motor, and the attached mechanical fan load, use a conservation-based modeling approach. Both the static and dynamic interaction characteristics “emerge” naturally from the model, simply because they are “connected” on the schematic. This approach to system modeling is much like assembling a hardware prototype, and does not require the user to develop an analytical model of the “plant” being controlled. Additional external electrical circuit components, mechanical loads and other “physical” elements can easily be added by simply placing them on the schematic and “wiring” them together. In fact, a more detailed implementation of the motor drive is shown in the companion example, “PID Speed Control Loop – Switching”. In that example, a design for the logic and power electronics needed to implement a PWM-based, switched MOSFET H-bridge drive is included.Because this version simulates very quickly compared to the switching version, it is well suited for early concept validation of the control strategy and PID tuning, loop stability and frequency response analysis, etc.

TDFS of PID Speed Control Loop - Continuous crane base - 2

Designer19

Member for

12 years

designs

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 concept development phase version of a fan speed control loop. It uses a PID-based (Proportional, Integral and Derivative) control strategy, with continuous block-diagram representation for both the controller and the voltage drive for the DC motor. The motor, which is characterized to represent an FRC (First Robotics Competition) CIM Motor, and the attached mechanical fan load, use a conservation-based modeling approach. Both the static and dynamic interaction characteristics “emerge” naturally from the model, simply because they are “connected” on the schematic. This approach to system modeling is much like assembling a hardware prototype, and does not require the user to develop an analytical model of the “plant” being controlled. Additional external electrical circuit components, mechanical loads and other “physical” elements can easily be added by simply placing them on the schematic and “wiring” them together. In fact, a more detailed implementation of the motor drive is shown in the companion example, “PID Speed Control Loop – Switching”. In that example, a design for the logic and power electronics needed to implement a PWM-based, switched MOSFET H-bridge drive is included.Because this version simulates very quickly compared to the switching version, it is well suited for early concept validation of the control strategy and PID tuning, loop stability and frequency response analysis, etc.

PID Speed Control Loop - Continuous crane base - 2

Designer19

Member for

12 years

designs

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 concept development phase version of a fan speed control loop. It uses a PID-based (Proportional, Integral and Derivative) control strategy, with continuous block-diagram representation for both the controller and the voltage drive for the DC motor. The motor, which is characterized to represent an FRC (First Robotics Competition) CIM Motor, and the attached mechanical fan load, use a conservation-based modeling approach. Both the static and dynamic interaction characteristics “emerge” naturally from the model, simply because they are “connected” on the schematic. This approach to system modeling is much like assembling a hardware prototype, and does not require the user to develop an analytical model of the “plant” being controlled. Additional external electrical circuit components, mechanical loads and other “physical” elements can easily be added by simply placing them on the schematic and “wiring” them together. In fact, a more detailed implementation of the motor drive is shown in the companion example, “PID Speed Control Loop – Switching”. In that example, a design for the logic and power electronics needed to implement a PWM-based, switched MOSFET H-bridge drive is included.Because this version simulates very quickly compared to the switching version, it is well suited for early concept validation of the control strategy and PID tuning, loop stability and frequency response analysis, etc.

PID Speed Control Loop - Continuous crane base - 2

Designer172616

Member for

7 years 10 months

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Description

This example shows a concept development phase version of a fan speed control loop. It uses a PID-based (Proportional, Integral and Derivative) control strategy, with continuous block-diagram representation for both the controller and the voltage drive for the DC motor. The motor, which is characterized to represent an FRC (First Robotics Competition) CIM Motor, and the attached mechanical fan load, use a conservation-based modeling approach. Both the static and dynamic interaction characteristics “emerge” naturally from the model, simply because they are “connected” on the schematic. This approach to system modeling is much like assembling a hardware prototype, and does not require the user to develop an analytical model of the “plant” being controlled. Additional external electrical circuit components, mechanical loads and other “physical” elements can easily be added by simply placing them on the schematic and “wiring” them together. In fact, a more detailed implementation of the motor drive is shown in the companion example, “PID Speed Control Loop – Switching”. In that example, a design for the logic and power electronics needed to implement a PWM-based, switched MOSFET H-bridge drive is included.Because this version simulates very quickly compared to the switching version, it is well suited for early concept validation of the control strategy and PID tuning, loop stability and frequency response analysis, etc.

PID Speed Control Loop - Continuous crane base

Designer172616

Member for

7 years 10 months

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Description

This example shows a concept development phase version of a fan speed control loop. It uses a PID-based (Proportional, Integral and Derivative) control strategy, with continuous block-diagram representation for both the controller and the voltage drive for the DC motor. The motor, which is characterized to represent an FRC (First Robotics Competition) CIM Motor, and the attached mechanical fan load, use a conservation-based modeling approach. Both the static and dynamic interaction characteristics “emerge” naturally from the model, simply because they are “connected” on the schematic. This approach to system modeling is much like assembling a hardware prototype, and does not require the user to develop an analytical model of the “plant” being controlled. Additional external electrical circuit components, mechanical loads and other “physical” elements can easily be added by simply placing them on the schematic and “wiring” them together. In fact, a more detailed implementation of the motor drive is shown in the companion example, “PID Speed Control Loop – Switching”. In that example, a design for the logic and power electronics needed to implement a PWM-based, switched MOSFET H-bridge drive is included.Because this version simulates very quickly compared to the switching version, it is well suited for early concept validation of the control strategy and PID tuning, loop stability and frequency response analysis, etc.

AD598 LVDT Position Sensing System

Designer19

Member for

12 years

designs

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

A Linear Variable Differential Transformer (LVDT) is used for a single-axis remote position sensing system. Analog signal conditioning is provided by an AD598* from Analog Devices. The AD595 features "ratiometric" signal scaling, which makes it insensitive to a common source of measurement error; That error due to excitation amplitude variability. This variation can be due to external changes in operation, such as cable length changes or cable temperature variation

This design is "Live - Interactive", so the user can change any of the parameters shown in blue, and run new simulations to see the results of those changes. It may be interesting to verify the rock-solid digital (integer) output codes that represent the position extremes for this mechanical system, even when the cable length and temperature are varied over their full supported range.

* This model of the AD598 is not certified by Analog Devices, and only represents behavior that is publicly described in the device datasheet.

PID Speed Control Loop - Switching

Designer40296

Member for

9 years 7 months

52

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Description

This example shows a more detailed circuit- and logic-level implementation of the PID Control Loop shown in the companion example, “PID Speed Control Loop – Continuous”. The ideal motor drive block of the “Continuous” version is expanded here, to include both a H-bridge motor drive, and also the digital logic necessary for converting the continuous PID controller output into the desired PWM signals that are distributed to drive the gates of the power MOSFET switches. The MOSFET model was calibrated to represent an IRF3710, using only information published on the manufacturer’s datasheet.The rest of the system, including the PID block-diagram controller, the mechanical fan load and the DC Motor characterized to represent an FRC (First Robotics Competition) CIM Motor, are the same as in the Continuous version. While the simulation time for this switching version is significantly longer, more detailed information about practical circuit performance and component sizing is available. For example, the fan speed step response is somewhat different from the conceptual design, because of the losses in the MOSFETs under high current conditions, as well as voltage drop in the battery. Also, information regarding component stress levels within the “datasheet specified” MOSFETs and Diodes is provided.

Loudspeaker Impedance

Designer19

Member for

12 years

designs

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

PID Speed Control Loop - Switching

Designer168601

Member for

7 years 11 months

11

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Description

This example shows a more detailed circuit- and logic-level implementation of the PID Control Loop shown in the companion example, “PID Speed Control Loop – Continuous”. The ideal motor drive block of the “Continuous” version is expanded here, to include both a H-bridge motor drive, and also the digital logic necessary for converting the continuous PID controller output into the desired PWM signals that are distributed to drive the gates of the power MOSFET switches. The MOSFET model was calibrated to represent an IRF3710, using only information published on the manufacturer’s datasheet.The rest of the system, including the PID block-diagram controller, the mechanical fan load and the DC Motor characterized to represent an FRC (First Robotics Competition) CIM Motor, are the same as in the Continuous version. While the simulation time for this switching version is significantly longer, more detailed information about practical circuit performance and component sizing is available. For example, the fan speed step response is somewhat different from the conceptual design, because of the losses in the MOSFETs under high current conditions, as well as voltage drop in the battery. Also, information regarding component stress levels within the “datasheet specified” MOSFETs and Diodes is provided.