How to install and use Accu-ROM™ on Ansys® Twin Builder™

1. Using Accu-ROM™

Using Accu-ROM
  • Select "Add-On Packages > Accu-ROM Electric Power Steering System"
Using Accu-ROM
Using Accu-ROM

*This function runs on Twin Builder™ and requires Twin Builder™ to operate.

2. Starting Accu-ROM™

Starting Accu-ROM
  • Launch Ansys Electronics Desktop and press Simplorer.
Starting Accu-ROM
  • From Twin Builder menu
    Toolkit > Accu-ROM_Electric Power Steering System
    Select OK.

3. How to set Accu-ROM™

How to set Accu-ROM
  • When the setting window opens, set in the following Step order. The setting of Step (6), (7) and (8) is mandatory. Configure the other Step as needed.
WAVE VIEWER
WAVE VIEWER

Step(1). Select steering scenario for steering. Currently, only Scenario A is preset.

Step(2). Press "Edit" to start WAVE VIEWER. Edit the steer scenario waveform as needed.

How to set Accu-ROM

Step(3). Selects the motor control method. Two types of control methods are currently preset.

  • Triangle-Wave Compare PWM method: A general modulation method for 3-phase PWM.
    This method generates PWM signals by comparing the carrier wave of the triangle wave with the UVW phase waveform.
  • Space Vector Modulation method: A method to generate PWM based on the spatial voltage vector.
    Compared with the triangle-wave comparison PWM method, the DC voltage utilization factor can be improved.
How to set Accu-ROM

Step(4). Set various parameters of the motor.

J: Moment of inertia　  ψ: Chain magnetic flux
Ld: d-axis inductance　p: Number of contacts
Lq: q-axis inductance　Rs: Winding resistance

Step(5). Set the thermal resistance and heat capacity of the printed circuit board and heat sink. To configure a multi-stage RC circuit, input multiple resistance and capacitance values by separating them with a space.

Step(6). Set the simulation time.

Step(7). Selects the power semiconductor (MOSFET) used for 3-phase inverter circuitry. Double-click to jump to the product page.

Step(8). Run : Starts the simulation.
             Setup Only : Saves the settings. No simulation is performed.

Option: The Advanced Settings window opens. Normally, this setting is not required. Refer to the following for details.

<Description of the detailed setting screen>

Accu-ROM™ is simulated under the following 4Step. Here you can make detailed settings for each Step.

Description of the detailed setting screen

1. Check Simulation :
Simulation for initial operation check.

2. Power Loss Control:
Simulation for reduced-order modeling of MOSFET model.

3. PreSim Control:
Simulation for reduced-order modeling of mechanical plant model. Operating Time of the main setting window is applied to End Time.

4. MainSim Control:
Simulation for reduced-order modeling of MOSFET and mechanical plant model. Operating Time of the main setting window is applied to End Time.

4. Analysis display of Accu-ROM™ (before reduced-order modeling)

Analysis display of Accu-ROM
  • The screen before reduced-order modeling is as follows.
Analysis display of Accu-ROM
  • The EPS (Electric Steering) mechanical plant model before reduced-order modeling consists of the following:

5. Analysis display of Accu-ROM™ (after reduced-order modeling)

Analysis display of Accu-ROM
  • The screen after reduced order modeling is as follows. MOSFET and mechanical plant model orders are reduced and automatically switched to the reduced-order model.

6. Analysis of Accu-ROM™

Analysis of Accu-ROM
  • Currently, the following analysis results are displayed as presets.

Related information

EDA/CAD Model Library
We provide simulation data, 3D models of packages, and land pattern models (2D models) used when developing product boards.
EDA/CAD Model Library
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*Ansys® and all other ANSYS, Inc. product names are trademarks or registered trademarks of ANSYS, Inc. or its subsidiaries in the United States or other countries.
*Accu-ROM™ is a trademark of TOSHIBA CORPORATION Device & Storage Corporation.
*Other company names, product names, service names, and the like may be used by each company as trademarks.

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