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Knowledge base » Software reference » MTB – Motor testbench

MTB – Motor testbench

By  Shu Wang  and  Luca Stroppiana Updated on SD306

Table of Contents

The MTB block is a simulation model included in the Imperix Power library. It models the imperix motor testbench in Simulink and PLECS simulation.

For more information regarding the Imperix Power library, please read Getting started with Imperix Power library.

Modeling of MTB

The Motor Testbench features a squirrel cage Induction Machine (IM) and a Permanent Magnet Synchronous Machine (PMSM). One machine is the device under test while the other one acts as a controllable load. The schematic is shown below.

schematic of MTB model

The MTB model has one modeling level:

  • (A) Simple

For more detailed model parameters and measurement results, please contact [email protected].

Machine parameters

All the parameters of the machines are summarized in the following tables.

ItemSymbolValue
Pole pairsp4
Moment of inertiaJm40.6e-4 kg.m^2
Friction coefficientkF30.35e-5
Stator resistanceRs0.559 Ω
Stator inductanceLs4.24 mH
Stator inductance along d-axisLd4.24 mH
Stator inductance along q-axisLq4.24 mH
Flux from permanent magnetsPhi_pm0.2748 Nm/Apk
Parameters of PMSM
ItemSymbolValue
Pole pairsp4
Moment of inertiaJm178e-4 kg.m^2
Friction coefficientkF30.35e-5
Stator resistanceRs1.24 Ω
Rotor resistanceRr0.73 Ω
Stator leakage inductanceLgs11.5 mH
Rotor leakage inductanceLgr11.5 mH
Mutual inductanceLm183 mH
Parameters of IM
ItemSymbolValue
Moment of inertia shaftJm_shaft54.7e-4 kg.m^2
Other parameters

Sensors

The motor testbench features an angle resolver and a torque sensor. The angle resolver is modeled by an ideal sensor with the angle initialized at 0, while the torque sensor is modeled by an ideal sensor with a 1kHz low-pass filter.

Simulink MTB block

Port specification

  • The output T is the measured torque.
  • The output θ is the measured rotor angle.
  • The connection ports im.A,im.B,im.C are the electrical ports connected to the three-phase AC input of the IM.
  • The connection ports pmsm.A,pmsmm.B,pmsm.C are the electrical ports connected to the three-phase AC input of the PMSM.
MTB Simulink block

Parameters

  • Modeling level selects the modeling level.
MTB Simulink mask

PLECS MTB block

Port specification

  • The output T is the measured torque.
  • The output θ is the measured rotor angle.
  • The connection ports im.A,im.B,im.C are the electrical ports connected to the three-phase AC input of the IM.
  • The connection ports pmsm.A,pmsmm.B,pmsm.C are the electrical ports connected to the three-phase AC input of the PMSM.
MTB PLECS block

Parameters

  • Modeling level selects the modeling level.
  • PMSM model selects the model of PMSM. The PMSM can be either implemented in the rotor reference frame or as a voltage behind reactance.
MTB PLECS mask

Probe signals

The following signals can be monitored by a Probe block in PLECS.

  • Torque [Nm] monitors the torque sensor output in Nm.
  • Rotor position [rad] monitors the rotor position in rad.
MTB PLECS probe

Shu is an experienced development engineer at imperix. He authored or co-authored numerous articles on the knowledge base, notably on FPGA-based control implementation and high-level synthesis tools and techniques.

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