Kin
10 kW
If you are a tl;dr person, skip to section tl;dr
As a technical note I understand that it's possible to increase the timing signals a controller gives in order to boost the RPM. I've ready a fair bit about that on ES with the hub motors and geared motors.
I'm wondering if there's any such thing as using soft timing to decrease the effective Kv of a RC motor with halls mod.
Context:
I intend on in the next few months modify CAD drawings for an aluminum frame e-kickscooter scooter, waterjet cut it (at first I was going to have to figure out how to use the CNCs at my school, which I dont yet know how and have many other things to learn as well, but bigbluesaws.com has very reasonable waterjetcutting costs).
I'm going to run Turnigy SK3 6374 150kv motor, and hopefully have figured out a drivebelt system by then (backup option = chain drive).
I intend on gearing to approximately 26-27mph top.
***Here's the catch***
I'd like to try and run this sensored, at a relatively low ~4k rpm, with a Lyen's controller for reliability and relatively easy settings tweaking. Lyen recently recommended a certain make of his 12Fet controller. For a few reasons- in part, cost and also in major part size, I'm trying to figure out if there's any way I can run his 9 Fet instead. Certain modifications can make it possible to put in a decently high (40-60a) current through the 9Fet controller.
Concerns:
---Max RPM
------>I understand because ebike controllers are not designed for RC Motors they might lose sync at the high rpms. By accident, since I want to limit RPM to limit high-pitched sound, I'm hoping that this won't be a problem.
---Current This is finally the point of my entire post here
-------> Originally I intended the motor to be running on 6s. With some RC controller supplying 40 amps continuous, 65amps peak, I reasoned that I could get exactly the sort of power I wanted out of the motors. Eventually I realized I wanted to use an ebike controller, and halls sensors, and suddenly my high current small size options plunged. I realize that I can deal with a RPM compromise by increasing my arbitrary personal limit on the running RPM, and set up the system for 9s. Now rather than needing 40amps to 65amps I'd only need 26 amps 45 amp burst. This makes it much more reasonable I think in the realm of ebike controllers. Now, finally, I'm here to ask if there's any way to reduce the effective Kv with 'soft timing' on the controller, and what the effects of that would be. Perhaps I could go up to 10s (somewhat more convenient) if soft timing is possible. I dont know. I've spent countless hours reading away, and don't really know a tenth of what's actually going on (perhaps my obsessive-state should have kicked in later, about 9 months down the line, when I'll have finished my more substantial Electromagnetic physics (E&M) course). This is not to say that a lot hasn't cleared up. I have a much clearer sense of whats happening, it's just that a lot is happening.
Recently I've had alot of questions about RC motors answered for me here, on a few seperate threads, so when I finally get this all down (in so far as completing a build) I'll try to compile everything to a single thread. I've tried my best to use the search functions (and google "site:Endless-sphere.com + query") but there remain a lot of questions that have only been answered when I just straight up and asked.
tl;dr
I'm here to ask if there's any way to reduce the effective Kv with 'soft timing' on the controller, and what the effects of that would be. [In the sense, I assume it would increase torque but I'm not sure how it would affect efficiency].
Context: I'm trying to minimize the total rpm of a 6374 150kv SK3 build, while still getting to the point I can deliver 600-800 continuous 1400w peak on 9 Fet Ebike controller.
As a technical note I understand that it's possible to increase the timing signals a controller gives in order to boost the RPM. I've ready a fair bit about that on ES with the hub motors and geared motors.
I'm wondering if there's any such thing as using soft timing to decrease the effective Kv of a RC motor with halls mod.
Context:
I intend on in the next few months modify CAD drawings for an aluminum frame e-kickscooter scooter, waterjet cut it (at first I was going to have to figure out how to use the CNCs at my school, which I dont yet know how and have many other things to learn as well, but bigbluesaws.com has very reasonable waterjetcutting costs).
I'm going to run Turnigy SK3 6374 150kv motor, and hopefully have figured out a drivebelt system by then (backup option = chain drive).
I intend on gearing to approximately 26-27mph top.
***Here's the catch***
I'd like to try and run this sensored, at a relatively low ~4k rpm, with a Lyen's controller for reliability and relatively easy settings tweaking. Lyen recently recommended a certain make of his 12Fet controller. For a few reasons- in part, cost and also in major part size, I'm trying to figure out if there's any way I can run his 9 Fet instead. Certain modifications can make it possible to put in a decently high (40-60a) current through the 9Fet controller.
Concerns:
---Max RPM
------>I understand because ebike controllers are not designed for RC Motors they might lose sync at the high rpms. By accident, since I want to limit RPM to limit high-pitched sound, I'm hoping that this won't be a problem.
---Current This is finally the point of my entire post here
-------> Originally I intended the motor to be running on 6s. With some RC controller supplying 40 amps continuous, 65amps peak, I reasoned that I could get exactly the sort of power I wanted out of the motors. Eventually I realized I wanted to use an ebike controller, and halls sensors, and suddenly my high current small size options plunged. I realize that I can deal with a RPM compromise by increasing my arbitrary personal limit on the running RPM, and set up the system for 9s. Now rather than needing 40amps to 65amps I'd only need 26 amps 45 amp burst. This makes it much more reasonable I think in the realm of ebike controllers. Now, finally, I'm here to ask if there's any way to reduce the effective Kv with 'soft timing' on the controller, and what the effects of that would be. Perhaps I could go up to 10s (somewhat more convenient) if soft timing is possible. I dont know. I've spent countless hours reading away, and don't really know a tenth of what's actually going on (perhaps my obsessive-state should have kicked in later, about 9 months down the line, when I'll have finished my more substantial Electromagnetic physics (E&M) course). This is not to say that a lot hasn't cleared up. I have a much clearer sense of whats happening, it's just that a lot is happening.
Recently I've had alot of questions about RC motors answered for me here, on a few seperate threads, so when I finally get this all down (in so far as completing a build) I'll try to compile everything to a single thread. I've tried my best to use the search functions (and google "site:Endless-sphere.com + query") but there remain a lot of questions that have only been answered when I just straight up and asked.
tl;dr
I'm here to ask if there's any way to reduce the effective Kv with 'soft timing' on the controller, and what the effects of that would be. [In the sense, I assume it would increase torque but I'm not sure how it would affect efficiency].
Context: I'm trying to minimize the total rpm of a 6374 150kv SK3 build, while still getting to the point I can deliver 600-800 continuous 1400w peak on 9 Fet Ebike controller.
