Timeline for Why P and N channel MOSFET is quite hot during braking of 3PH BLDC motor?
Current License: CC BY-SA 4.0
20 events
| when toggle format | what | by | license | comment | |
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| Apr 24, 2019 at 13:36 | comment | added | winny | "In this design, MOSFET gate pulse is in voltage range of 18-20 volt." Why? Absolute max is rated at 20 V for both type of transistors. How much does the rail voltage rise to during breaking? | |
| Apr 24, 2019 at 10:25 | vote | accept | Vivek Nirmal | ||
| Apr 24, 2019 at 10:07 | history | edited | JRE | CC BY-SA 4.0 |
deleted 105 characters in body
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| Apr 24, 2019 at 9:56 | comment | added | D.A.S. | Read about deadtime control with gate diodes to speed up turn-off delay then read about “regenerative braking” PWM control on low side then suitable heat sink as kinetic energy is being converted to battery charge. So current limit by acceleration demand cannot exceed heat loss removal design. But avoid cross-conduction. | |
| Apr 24, 2019 at 9:53 | comment | added | JimmyB | How long does it take for the motor to stop when braking? How frequent is it stopped? I.e., estimate how much power/energy is expected to be dissipated in the FETs. If it's like 1W for 250ms that shouldn't heat the FETs a lot, if it's 20W for 2s that's a different story. | |
| Apr 24, 2019 at 9:48 | answer | added | Cursorkeys | timeline score: 2 | |
| Apr 24, 2019 at 9:44 | comment | added | Vivek Nirmal | currently, frequency is around 15Khz and motor current 5.1 continuous at 12000 rpm | |
| Apr 24, 2019 at 9:35 | comment | added | Bimpelrekkie | You're now very focused on the values of the gate resistors. In the datasheet I do not see any gate resistors in the application diagrams. That leads me to conclude that maybe gate resistors aren't strictly needed (but feel free to prove me wrong and explain why they need to be there). The information that's lacking from your question is the motor current and at what frequency you're driving the motor. | |
| Apr 24, 2019 at 9:33 | history | edited | Vivek Nirmal | CC BY-SA 4.0 |
added 92 characters in body
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| Apr 24, 2019 at 9:25 | comment | added | Vivek Nirmal | okay, I have done it. but please let back to the problem. when I wanted to stop the motor then the single PWM from the pic controller stops the PWM to the a4963 ic. after that A4963 will stop the PWM gradually. I didn't have control over it. | |
| Apr 24, 2019 at 9:24 | history | edited | Vivek Nirmal | CC BY-SA 4.0 |
added 120 characters in body; edited title
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| Apr 24, 2019 at 9:23 | history | edited | Neil_UK | CC BY-SA 4.0 |
you hit the 'edit' button below your post
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| Apr 24, 2019 at 9:22 | comment | added | Bimpelrekkie | How about turning off your Caps Lock? That's on your keyboard. The text in your question is lowercase so why are only your title and the comment above only uppercase. So you do know how to use Caps Lock. Use "edit" at the bottom of the question to edit it, then you can re-type the title, this time without Caps Lock on. This is about using a computer, you should not be a newbee at that. | |
| S Apr 24, 2019 at 9:21 | history | suggested | Cursorkeys | CC BY-SA 4.0 |
Fixed ALL UPPERCASE
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| Apr 24, 2019 at 9:19 | comment | added | HandyHowie | Which mosfets are you turning on when activating the brake? | |
| Apr 24, 2019 at 9:09 | comment | added | R Drast | Aside from the shouting... If you are braking a motor, you are removing energy from it. That energy has to go somewhere, and typically ends up as heat. Are you using heatsinks on your power devices? | |
| Apr 24, 2019 at 9:09 | review | Suggested edits | |||
| S Apr 24, 2019 at 9:21 | |||||
| Apr 24, 2019 at 9:08 | comment | added | Transistor | Please edit your question to remove SHOUTING from the title and post. Add links to datasheets. | |
| Apr 24, 2019 at 9:05 | review | First posts | |||
| Apr 24, 2019 at 9:08 | |||||
| Apr 24, 2019 at 9:04 | history | asked | Vivek Nirmal | CC BY-SA 4.0 |