Timeline for PWM control of air core motor
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Oct 6, 2014 at 10:24 | comment | added | Andy aka | @John - I'm not surprised the force is not linear (as per the reasons I give) | |
| Oct 6, 2014 at 10:14 | comment | added | John | I'm saying that others appear to have experienced a similar problem with what appears to be a reduced force on the magnet when the magnet is close to being aligned with one of the coils, but no-one has explained why this might be the case. | |
| Oct 6, 2014 at 9:51 | comment | added | Andy aka | @John so, what you are saying is..... | |
| Oct 6, 2014 at 9:41 | comment | added | John | Having physically inspected the air core, the 2 coils actually surround the magnet, so the magnet is in the middle of the linear flux area shown in your first picture. The patent here (google.com/patents/US4991098) describes a similar issue, but its genesis is in a software controlled PWM waveform that is difficult to manage when close to 0 & 100%. We are using a hardware controlled PWM waveform, so there is no issue with the microprocessor being unable to create the appropriate PWM duty cycle. | |
| Oct 2, 2014 at 19:21 | history | edited | Andy aka | CC BY-SA 3.0 |
added 937 characters in body
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| Oct 2, 2014 at 19:08 | history | answered | Andy aka | CC BY-SA 3.0 |