Editing 3-level PWM vs 2-level PWM
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:The output of 3-level PWM are in-phase with each other which yields three distinct voltage levels of voltage differential over the load. The third voltage level is ''zero voltage'' which features lower current rate of change in the coil yielding lower total current ripple. | :The output of 3-level PWM are in-phase with each other which yields three distinct voltage levels of voltage differential over the load. The third voltage level is ''zero voltage'' which features lower current rate of change in the coil yielding lower total current ripple. | ||
==Simulated waveforms== | ==Simulated waveforms== | ||
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===2-level PWM=== | ===2-level PWM=== | ||
[[File:Pwm2level m.PNG]] | [[File:Pwm2level m.PNG]] | ||
===3-level PWM=== | ===3-level PWM=== | ||
[[File:Pwm3level m.PNG]] | [[File:Pwm3level m.PNG]] | ||
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==Effects== | ==Effects== | ||
While 3 level PWM may require more sophisticated control circuity, it gives benefits of notably reduced ripple current which has benefits such as reduced motor heat dissipation and longer motor bearing life. Current ripple directly relates wearing bearings due to eddy currents in metallic materials. | While 3 level PWM may require more sophisticated control circuity, it gives benefits of notably reduced ripple current which has benefits such as reduced motor heat dissipation and longer motor bearing life. Current ripple directly relates wearing bearings due to eddy currents in metallic materials. | ||
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