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We introduce analysis cases that we received inquiries from customers and are often viewed on the WEB.

230 – 6-Phase SPM Motor Inverter Fault Simulation


In recent years, multiphase design has been adopted for automotive motors due to the merits of cost reduction and improvement in functions.
For example, for power supplies there are 6-phase motors with 3-phase double windings that use two inverters, having a 30 deg phase shift in electrical angle. From this, by using multiple inverters, enhanced redundancy of the in-vehicle motor system is achieved. The motor system can be stopped safely without falling to be in an uncontrollable state even if a failure occurs in a part of an inverter. However, circuit simulation is necessary to accurately evaluate safety.

When an inverter malfunctions, from overcurrent flowing and from the range of the magnetic field in and around the steel plate where the magnetization properties are nonlinear, inductance exhibits nonlinear behavior as well. Because of this, a highly accurate plant model cannot be created using only linear methods. In JMAG, it is possible to create a plant model that models actual motors in detail taking into account magnetic saturation characteristics and spatial harmonics exhibited in motors.
In this example, a JMAG-RT model of a 6-phase SPM is loaded into a control/circuit simulator, and circuit simulation for an inverter failure is carried out.

Control Circuit

The control circuit is shown in Fig. 1. A command value of current amplitude of 8 Apeak and current phase of 0 deg is used, and the voltage command value is sent to the motor via the inverter. Inverter 1 is connected to the U1, V1, and W1 phase terminals, and inverter 2 is connected to the U2, V2, and W2 phase terminals. In addition, a fault alarm is set to go off at 0.02 sec after the start of simulation execution.

Please see the website for “Current Waveform, Torque Waveform”.

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Sample data is available to JMAG proper users and requires license ID to access.
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JMAG & PSIM Users Conference 2021

This is to announce that the European JMAG distributor POWERSYS will be holding the JMAG&PSIM Users Conference 2021.
This conference will center around case studies using JMAG and PSIM, and will be held online from September 27th to October 1st, 2021.

Experts and developers in the field of electricity and power electronics will be in assembly at the conference, with those from countries outside of Europe also more than welcome to take part.
We look forward to your participation.

Please see the following page for the details.

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