Motor-CAD Lab model example script

This example provides a Motor-CAD Lab model script.

Set up example

Setting up this example consists of performing imports, launching Motor-CAD, disabling all popup messages from Motor-CAD, and opening the file for the lab model.

Perform required imports

import os

import matplotlib.pyplot as plt
from scipy import io

import ansys.motorcad.core as pymotorcad

if "QT_API" in os.environ:
    os.environ["QT_API"] = "pyqt"

Launch Motor-CAD

print("Starting initialization.")
mcad = pymotorcad.MotorCAD()

Starting initialization.

Disable popup messages

mcad.set_variable("MessageDisplayState", 2)

Open relevant file

Specify the working directory and open the relevant file for the lab model.

working_folder = os.getcwd()
mcad.load_template("e8")
mcad_name = "e8_mobility"
mcad.save_to_file(os.path.join(working_folder, mcad_name + ".mot"))

print("Initialization completed.")

Initialization completed.

Build model

Set build options for the lab model.

mcad.set_variable("ModelType_MotorLAB", 1)
mcad.set_variable("SatModelPoints_MotorLAB", 0)
mcad.set_variable("LossModel_Lab", 0)
mcad.set_variable("ModelBuildSpeed_MotorLAB", 10000)
mcad.set_variable("MaxModelCurrent_MotorLAB", 480)
mcad.set_variable("BuildSatModel_MotorLAB", True)

Show the lab context.

mcad.set_motorlab_context()

Build the model.

mcad.clear_model_build_lab()
mcad.build_model_lab()

Change operating modes.

mcad.set_variable("OperatingMode_Lab", 0)

Calculate e-magnetic performance

Set e-magnetic calculation options.

mcad.set_variable("EmagneticCalcType_Lab", 0)
mcad.set_variable("SpeedMax_MotorLAB", 10000)
mcad.set_variable("Speedinc_MotorLAB", 250)
mcad.set_variable("SpeedMin_MotorLAB", 500)
mcad.set_variable("Imax_MotorLAB", 480)

Calculate e-magnetic performance.

try:
    mcad.calculate_magnetic_lab()
    print("Magnetic calculation successfully completed.")
except pymotorcad.MotorCADError:
    print("Magnetic calculation failed.")

Magnetic calculation successfully completed.

Retrieve results.

data = io.loadmat(os.path.join(working_folder, mcad_name, "Lab", "MotorLAB_elecdata.mat"))
speed = data["Speed"]
shaft_torque = data["Shaft_Torque"]
shaft_power = data["Shaft_Power"]

Plot results

Plot torque/speed curve results.

plt.figure(1)
plt.subplot(211)
plt.plot(speed, shaft_torque)
plt.xlabel("Speed")
plt.ylabel("Shaft Torque")
plt.subplot(212)
plt.plot(speed, shaft_power)
plt.xlabel("Speed")
plt.ylabel("Shaft Power")
plt.show(block=False)
plt.savefig(os.path.join(working_folder, "../Maximum Torque VS Speed Curve.png"))

Calculate operating point

Set operating point calculation options.

mcad.set_variable("OpPointSpec_MotorLAB", 1)
mcad.set_variable("StatorCurrentDemand_Lab", 480)
mcad.set_variable("SpeedDemand_MotorLAB", 4000)
mcad.set_variable("LabThermalCoupling", 0)
mcad.set_variable("LabMagneticCoupling", 0)

# Calculate operating point.

mcad.calculate_operating_point_lab()

Retrieve results.

op_point_shaft_torque = mcad.get_variable("LabOpPoint_ShaftTorque")
op_point_efficiency = mcad.get_variable("LabOpPoint_Efficiency")
print("Operating Point Shaft Torque = ", op_point_shaft_torque)
print("Operating Point Efficiency = ", op_point_efficiency)

Operating Point Shaft Torque =  293.835082149656
Operating Point Efficiency =  96.9423046763756

Exit Motor-CAD

Exit Motor-CAD.

mcad.quit()
print("Simulation completed.")

Simulation completed.