Overview
New motor designs struggle to deal with heat generation more than conventional motors due to the higher power density. That is why engineers must tackle the thermal design alongside the magnetic circuit design. The heat generated during operation varies under different usage conditions. Performance evaluations can prevent design rework by assessing if a motor can operate within the permissible temperature range during continuous, short-time, and other duty cycles.
JMAG can run simulations that use temperature-dependent efficiency maps to take into account the magnetic and thermal characteristics in order to obtain realistic efficiency maps for each duty cycle.
This case study obtains the N-T curves for a nabla-shaped IPM motor under various duty cycles while taking into account the temperature limits of each part. The analysis results indicate that the IPM motor can operate for up to 10 minutes to sustain the target torque at 5,000 rpm.
IPM Motor
Conditions
| Coil temperature limit | 140 deg C |
| Magnet tempetaure limit | 100 deg C |
| Torque at 5,000 rpm | 100 Nm or higher |
| Operating Time | 1, 5, and 10 minutes |
Fig. 1 IPM Motor and Conditions
The case study evaluates N-T curves for a nabla-shaped IPM motor with 8 poles and 48 slots that is running in a short-time duty cycle while accounting for part temperature limits.
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