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Discussion
300A 100V DIY ESC design goal
This thread was "Getting Tired of ESC problems."
https://www.rcgroups.com/forums/showthread.php?t=879898 Decided to change to a new thread seeing that "Getting Tired" didn't mean much to anyone. |
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Thread OP
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Smoke is beginning to clear(blow away). 300amp 100v ESC
This is some of the first turns on a hard supply.
I'm always impressed with the 80-100 Turnigy motor with a 32x10 prop. This is only running at 1/8 the motor capacity as advertised. Video:
Stay Tuned! |
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Thread OP
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Right now the board has 8 NPN mosfets out of 32. We're doing initial tests and software with a reduced #. The ESC is targeted for ironless motors and can switch up to 400KHz. The switching frequency can be set any where between 10KHz to 400KHz. So far we've fried 3 FETs and two gate drivers. Looking pretty good now though.
We'll keep posting as it goes. Some pictures soon too. |
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You should have given him goggles
Erstwhile, what have you been doing about the motor? (that's the part I'm curious about). I presume you are planning only running to 48V with those FET's? 100V/2 == 50V for safety factor (need that especially if you plan to do an ultra light ... failure is not a good option). Cyb |
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Motor controller step 2
We've populated all of the FETs. Here is the next run of the controller:
Total output was about 4kW (5.2 HP) (40.5V, 98A). The FETs and motor were cool enough to comfortably touch. I figure, we can expect to get a LOT more out of this controller if we added a heat sink. This run was at a 100KHz switching rate (the previous video was 150KHz). - Kipp |
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congrats kipp, it's great to see this kind of work being done by average hobby guys!
phil |
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@Churd || Kipp
What are the benifits/purpose of the high PWM frequency, 100-150kHz? Compared to the 'standard' 8, 16 and 32kHz frequencies? Methods for better controlling cooling: http://mgm-compro.com/index.php?cat=...al-information -> controller cooling in models Vriendelijke groeten Ron |
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Why such a high frequency?Quote:
- Kipp |
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Quote:
However with our ESC running at 100KHz and up to 5.3 HP the motors are just at the beginning of lightly warm. I think 8KHz is too low for these motors and now with our ESC I'm getting encouraged as to motors actually meeting their 6500 watt spec. So in this case 100KHz is better than 8KHz. Kipp and I have to discuss what we're going to do with the design. Stay tuned..... |
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Have you guys read about the split phase motor controller over at www.acpropulsion.com? He uses different groups of mosfets each switching at at low frequency. When combined this gives a combined PWM that is much higher. He did this to reduce the switching losses in the MOSFET's, but his application is for a solar airplane where the higher Rm isn't the main concern since it operates mostly at very low power.
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Thread OP
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Quote:
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