Magnetization and Analysis of a PM Motor (TR)
Mapping Magnetization Data using the Magnetizing Tool

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Mapping to magnet data using the magnetizing tool

In devices using permanent magnets, magnetization often affects the performance. Evaluating whether the magnetization pattern works well in actual operation and establishing the conditions for achieving the desired magnetization pattern are important points in the design stage. JMAG is capable of simulating both the magnetization process of a magnetic material and the subsequent use of the magnet produced. This allows the magnetization and performance analysis of the device to be performed sequentially. The example shown here is the simulation of the magnetization of a plastic magnet using a polar anisotropic magnet and its subsequent use in the rotor of a permanent magnet (See Figure 1).

Figure 1 - The permanent magnet motor used for the simulation Enlarged View

The first step in the simulation is to determine the magnetization pattern in the plastic magnet. The directions of the magnetic flux density in the plastic magnet that are obtained in this simulation are assumed to be the orientation angle, and the magnetic distribution is determined with an appropriate magnetizing rate (See Figure 2).

Figure 2 - Simulation of magnetizing distribution Enlarged View

The second step is to create a model of the motor and map the magnetizing distribution to it. Mapping can be performed using the JMAG magnetization tool (See Figure 3).

Figure 3 - Model creation and mapping of magnetizing distribution Enlarged View

The mesh for these two models (magnetization and motor models) may differ, and the models can be created without having to worry about consistency. The use of multiple magnetization results is also acceptable. In the analysis example, the induced voltage is calculated with the magnetized magnet built into the motor. Figure 4 shows the induced voltage waves.

Figure 4 - Induced voltage waves distribution Enlarged View

Magnetic flux distribution variations with time Animation of magnetic flux density distribution varying with time. Actual variations can be seen on the screen. For a detailed view, see the full animation file (112 kB).