# Problem with permanent magnet synchronous machine simulink

• andrea-94
In summary, the conversation involves a problem with a simulation in Matlab-Simulink of a permanent magnet synchronous machine connected to a DC current source via a rectifier. The current of the rectifier is infinite and the simulation does not work when a negative torque is input into the PMSM. The model being used is a 3-phase machine with a neutral connection, and it is connected to a rectifier. The question is raised about limiting the charging current for the voltage source/battery.
andrea-94
Hi I would ask someone that is pratical with Simulink in particular of Simscape about a problem which involve my simulation in Matlab-Simulink of a permanent magnet synchronous machine that is connected, by a rectifier, to a DC current source.
all the blocks of the simuation are included into the Simulink library.
I try to input a constant torque in the PMSM (which has to be negative sign to use in generator mode) but the simulation doesn't woek and the current of the rectifier is infinite.
thank's everybody I hope someone colud help me.

## 1. What is a permanent magnet synchronous machine (PMSM)?

A PMSM is an electric motor that uses permanent magnets in its rotor to create a magnetic field. This type of motor is commonly used in applications that require high efficiency and precision control, such as electric vehicles and industrial machinery.

## 2. What is the problem with simulating PMSMs in Simulink?

The main problem with simulating PMSMs in Simulink is accurately modeling the nonlinear behavior of the motor. PMSMs have complex electrical and mechanical interactions that are difficult to capture in a simulation.

## 3. How can the problem with simulating PMSMs in Simulink be addressed?

The problem can be addressed by using advanced simulation techniques, such as field-oriented control (FOC) and finite element analysis (FEA). These tools allow for more accurate modeling of the PMSM's behavior and can improve simulation results.

## 4. What are some common challenges when simulating PMSMs in Simulink?

Some common challenges include accurately modeling the motor parameters, accounting for nonlinearities and saturation effects, and implementing advanced control strategies. Additionally, obtaining accurate data for the simulation can also be a challenge.

## 5. Are there any alternative simulation tools for PMSMs?

Yes, there are other simulation tools specifically designed for PMSMs, such as ANSYS Maxwell and Motor-CAD. These tools may offer more specialized features and capabilities for simulating PMSMs compared to Simulink. However, Simulink remains a popular choice for PMSM simulation due to its versatility and integration with other systems.

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