# Static Torque Analysis on Servo Motor

Calculation of the Motor Torque of a rotating 2D model shown on the example of a Siemens Servo Motor 1FT6.

## Initial Situation

### Siemens Servo Motor 1FT6

This universal synchronous motor is used for many high-performance motion control applications. It uses permanent-magnets, has very small torque ripple and an almost constant torque characteristic.

*Picture: CAD Model*

The motor we analyzed uses 36 nuts, 8 permanentmagnets, 4 poles.

In the first step our goal is to analyze torque over rotor angle. This can be done quite easy in 2D using the magnetostatic solutiontype.

## Appropriate Method

### 2D Magnetostatic Analysis

In the NX Advanced Simulation preprocessor the mesh is created in 2D, material properties are assigned from the delivered library as well as currents as boundary conditions.

*Picture: Resulting Flux Density*

The analysis is performed as a step by step analysis, taking into account the rotation of the rotor and the harmonic behaviour of the currents.

In the postprocessor a conturplot of the magnetic flux-density is shown. Also a video of the rotating motor can be displayed

## Result

### Torque over Time

The rotor is turning 90 degrees with a step size of 1 degree. We compute for the torque-curve under full load condition.

*Picture: Resulting Torque*

The computed torque is about 18 Nm what is close to the measurement.

Also the ripple is quite small