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MOSFET Switching Design - BLDC

nandor.bodo
Designer236011

nandor.bodo

Member for

4 years

350

designs

10

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Nandor Bodo has over 7 years of experiences in power electronics and drives, 4 of which are as a researcher and lecturer of power electronics and drives. He has a PhD power electronics from Liverpool John Moores University, and an MSc in Power Electronics.

Nandor has background in high power multiphase motor control, power conversion, EV chargers and various semiconductor power devices, including Power MOSFETs and IGBTs. He has released over 30 internationally recognised publications.

Description

This design is similar to the design "Ideal Switching Design for Moog PMSM - BLDC Motor Use-Case", but the ideal switches in the inverter are replaced with "Datasheet" Power MOSFET models. These models are calibrated to match the datasheet specified characteristics of an STW45NM50 device. This replacement required the conversion to the digital signals used to control the switch states, to actual gate voltages. So representative models of the necessary gate drivers were also added.

In addition, a "hot part monitor" model was added to one of the Power MOSFETs. This models the datasheet specified "Rthj_amb" (0.32 degrees C per Watt), in order to predict the internal junction temperature during different phases of inverter operation. A thermal time-constant of 1 ms was assumed, which may be quite unrealistic. It is possible to add much higher fidelity thermal network models of the heat transfer path if valid parameters are given.

Finally, one of the low-pass filters used in the current sense path was changed to reflect a possible circuit implementation using op-amps. This is to show the ability to move seamlessly between ideal signal-flow (or continuous transfer function block) modeling to circuit implementation modeling, anywhere in a system design.

You can also see a version of this design that uses the manufacturer provided SPICE model for the Power MOSFET: "STW45NM50 MOSFET Switching Design for Moog PMSM - BLDC Motor Use-Case"

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MOSFET Switching Design - Motor - Current source load InfL1L2

nandor.bodo
Designer236011

nandor.bodo

Member for

4 years

350

designs

10

groups

Nandor Bodo has over 7 years of experiences in power electronics and drives, 4 of which are as a researcher and lecturer of power electronics and drives. He has a PhD power electronics from Liverpool John Moores University, and an MSc in Power Electronics.

Nandor has background in high power multiphase motor control, power conversion, EV chargers and various semiconductor power devices, including Power MOSFETs and IGBTs. He has released over 30 internationally recognised publications.

Description

This design is similar to the design "Ideal Switching Design for Moog PMSM - BLDC Motor Use-Case", but the ideal switches in the inverter are replaced with "Datasheet" Power MOSFET models. These models are calibrated to match the datasheet specified characteristics of an STW45NM50 device. This replacement required the conversion to the digital signals used to control the switch states, to actual gate voltages. So representative models of the necessary gate drivers were also added.

In addition, a "hot part monitor" model was added to one of the Power MOSFETs. This models the datasheet specified "Rthj_amb" (0.32 degrees C per Watt), in order to predict the internal junction temperature during different phases of inverter operation. A thermal time-constant of 1 ms was assumed, which may be quite unrealistic. It is possible to add much higher fidelity thermal network models of the heat transfer path if valid parameters are given.

Finally, one of the low-pass filters used in the current sense path was changed to reflect a possible circuit implementation using op-amps. This is to show the ability to move seamlessly between ideal signal-flow (or continuous transfer function block) modeling to circuit implementation modeling, anywhere in a system design.

You can also see a version of this design that uses the manufacturer provided SPICE model for the Power MOSFET: "STW45NM50 MOSFET Switching Design for Moog PMSM - BLDC Motor Use-Case"

About text formats

MOSFET Switching Design - Motor - Current source load - T6MOSFET

nandor.bodo
Designer236011

nandor.bodo

Member for

4 years

350

designs

10

groups

Nandor Bodo has over 7 years of experiences in power electronics and drives, 4 of which are as a researcher and lecturer of power electronics and drives. He has a PhD power electronics from Liverpool John Moores University, and an MSc in Power Electronics.

Nandor has background in high power multiphase motor control, power conversion, EV chargers and various semiconductor power devices, including Power MOSFETs and IGBTs. He has released over 30 internationally recognised publications.

Description

This design is similar to the design "Ideal Switching Design for Moog PMSM - BLDC Motor Use-Case", but the ideal switches in the inverter are replaced with "Datasheet" Power MOSFET models. These models are calibrated to match the datasheet specified characteristics of an STW45NM50 device. This replacement required the conversion to the digital signals used to control the switch states, to actual gate voltages. So representative models of the necessary gate drivers were also added.

In addition, a "hot part monitor" model was added to one of the Power MOSFETs. This models the datasheet specified "Rthj_amb" (0.32 degrees C per Watt), in order to predict the internal junction temperature during different phases of inverter operation. A thermal time-constant of 1 ms was assumed, which may be quite unrealistic. It is possible to add much higher fidelity thermal network models of the heat transfer path if valid parameters are given.

Finally, one of the low-pass filters used in the current sense path was changed to reflect a possible circuit implementation using op-amps. This is to show the ability to move seamlessly between ideal signal-flow (or continuous transfer function block) modeling to circuit implementation modeling, anywhere in a system design.

You can also see a version of this design that uses the manufacturer provided SPICE model for the Power MOSFET: "STW45NM50 MOSFET Switching Design for Moog PMSM - BLDC Motor Use-Case"

About text formats

Copy of MOSFET Switching Design - Motor - Current source load - on Tue, 01/05/2021 - 11:22

andrew.berry
Designer233379

andrew.berry

Member for

4 years 3 months

85

designs

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Description

This design is similar to the design "Ideal Switching Design for Moog PMSM - BLDC Motor Use-Case", but the ideal switches in the inverter are replaced with "Datasheet" Power MOSFET models. These models are calibrated to match the datasheet specified characteristics of an STW45NM50 device. This replacement required the conversion to the digital signals used to control the switch states, to actual gate voltages. So representative models of the necessary gate drivers were also added.

In addition, a "hot part monitor" model was added to one of the Power MOSFETs. This models the datasheet specified "Rthj_amb" (0.32 degrees C per Watt), in order to predict the internal junction temperature during different phases of inverter operation. A thermal time-constant of 1 ms was assumed, which may be quite unrealistic. It is possible to add much higher fidelity thermal network models of the heat transfer path if valid parameters are given.

Finally, one of the low-pass filters used in the current sense path was changed to reflect a possible circuit implementation using op-amps. This is to show the ability to move seamlessly between ideal signal-flow (or continuous transfer function block) modeling to circuit implementation modeling, anywhere in a system design.

You can also see a version of this design that uses the manufacturer provided SPICE model for the Power MOSFET: "STW45NM50 MOSFET Switching Design for Moog PMSM - BLDC Motor Use-Case"

About text formats

MOSFET Switching Design - Motor - Current source load - on Tue, 01/05/2021 - 11:10

andrew.berry
Designer233379

andrew.berry

Member for

4 years 3 months

85

designs

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BAdd a bio to your profile to share information about yourself with other SystemVision users.

Description

This design is similar to the design "Ideal Switching Design for Moog PMSM - BLDC Motor Use-Case", but the ideal switches in the inverter are replaced with "Datasheet" Power MOSFET models. These models are calibrated to match the datasheet specified characteristics of an STW45NM50 device. This replacement required the conversion to the digital signals used to control the switch states, to actual gate voltages. So representative models of the necessary gate drivers were also added.

In addition, a "hot part monitor" model was added to one of the Power MOSFETs. This models the datasheet specified "Rthj_amb" (0.32 degrees C per Watt), in order to predict the internal junction temperature during different phases of inverter operation. A thermal time-constant of 1 ms was assumed, which may be quite unrealistic. It is possible to add much higher fidelity thermal network models of the heat transfer path if valid parameters are given.

Finally, one of the low-pass filters used in the current sense path was changed to reflect a possible circuit implementation using op-amps. This is to show the ability to move seamlessly between ideal signal-flow (or continuous transfer function block) modeling to circuit implementation modeling, anywhere in a system design.

You can also see a version of this design that uses the manufacturer provided SPICE model for the Power MOSFET: "STW45NM50 MOSFET Switching Design for Moog PMSM - BLDC Motor Use-Case"

About text formats

Copy of AFE_4 on Thu, 12/31/2020 - 09:59

arlie.stonestreet
Designer237268

arlie.stonestreet

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3 years 10 months

5

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Copy of AFE_3 on Wed, 12/30/2020 - 21:07

arlie.stonestreet
Designer237268

arlie.stonestreet

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3 years 10 months

5

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Copy of AFE_2 on Wed, 12/30/2020 - 19:05

arlie.stonestreet
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arlie.stonestreet

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AFE_1

arlie.stonestreet
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arlie.stonestreet

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Electric Power Steering System with Ideal PMSM and Drive

daniel.kho
Designer237294

daniel.kho

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3 years 10 months

4

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1

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Description

This design includes an ideal Permanent Magnet Synchronous Machine (PMSM) model, as well as a continuous D-Q controller and drive circuit. The mechanical load model includes static and kinetic friction, a steering force that varies with rack displacement, as well as various mass, inertia, damping and spring/stiffness elements of the steering system. The steering torque, applied by the vehicle's driver, is assisted by torque from the motor scaled by the gear ratio. For the control, a non-linear gain profile is specified in the "torque_assist_table" function, and a lead-lag compensator is used to improve system stability.

Note that this is a "tunable" design. Many of these system parameters can be changed by the user. Then a new simulation can be run and the updated results can be observed in the waveform viewers.

In a companion versions of this design, "EPS System with MotorSolve Generated PMSM Model and Ideal Drive", the ideal PMSM is replaced with a more realistic motor model generated by MotorSolve, the motor design tool. That model includes cogging torque, saturation and torque ripple behavior, which is seen to have a significant effect in this power steering application.

A second companion design, "EPS System with MotorSolve Generated PMSM Model and DQ/SVM Drive", uses both the MotorSolve motor model and also a sampled-data D-Q control algorithm and space-vector modulation (SVM) to control the switches in a power electronics circuit. This shows the ability to develop motor control and drives at the abstract level and also at the circuit level.

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nandor.bodo
Designer236011

nandor.bodo
Designer236011

nandor.bodo
Designer236011

andrew.berry
Designer233379

andrew.berry
Designer233379

arlie.stonestreet
Designer237268

arlie.stonestreet
Designer237268

arlie.stonestreet
Designer237268

arlie.stonestreet
Designer237268

daniel.kho
Designer237294