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SRM Design Optimization using OptiNet
Gallery spotlightMotors & Generators
The design of Switched Reluctance Motors (SRM) is a complex optimization problem involving a large number of geometrical and electrical parameters. In practice, this can be a challenging task involving a large number of iterations and a long design cycle.
The example presented here demonstrates how OptiNet searches for the improved design of a 8/6 SRM to maximize the torque generated while conforming to manufacturing and operating constraints.
METHODS and RESULTS
Variables
The geometry of the motor is defined based on the parameters shown in this figure:
- Pole angles (ßr , ßs )
- Pole heights (Hr , Hs )
- Back iron depth
SETTING the VARIABLES in OPTINET
The initial, minimum and maximum values of each variable are entered. The user has the ability to vary the parameters as continuous or discreet variables.
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OBJECTIVE FUNCTION - maximizing the average torque
The objective is to maximize the average torque on the rotor while running at a peak current of 14.5 amps.
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CONSTRAINTS - average torque
In this example, there is a constraint that the average torque on the rotor must be greater than 27.0 Nm.
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MAXIMUM TORQUE ON ROTOR vs SOLUTION INDEX
After 13 hours, OptiNet has evaluated the design objectives and constraints against over one hundred thirty different SRM designs (as defined by the tolerances on each variable), represented here by each point on the solution index.
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Initial |
Final |
|
|---|---|---|
| βr | 16 degrees | 18.92 degrees |
| βs | 11.5 degrees | 11.93 degrees |
| Hr | 18.0 mm | 18.92 mm |
| Hs | 25.0 mm | 26.16 mm |
| Avg. Torque | 33.19 Nm | 35.16 Nm |
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