Author Topic: Hobby BLDC ESC snsor connections  (Read 2352 times)

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Offline CirclotronTopic starter

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Hobby BLDC ESC snsor connections
« on: April 18, 2024, 05:28:13 am »
Looking on ebay for a small electronic speed control for a PMSM with sensors. The motor I want to use it on has 3 sensors, so a ground wire and three others. Many of the sensor ESCs I have looked at seem to only have 3 sensor wires, red, black, white. Is this for a potentiometer connection instead? So how would connect three sensors? Example ESC ->  https://www.ebay.com.au/itm/315093498324?itmmeta=01HVQT2F6ED5QHD9GKQXH79FK0&hash=item495d0939d4:g:bv4AAOSwkz1lojwl&itmprp=enc%3AAQAJAAAA8MSg8sdXiwgJOAvXwOYbBAWlrRL93sAXiw3NYa4fA5r5cQ9Uki4fI6PpcXgkGaTaXxZwj5uWTMyT4YG4L%2BIXsKIFBWkthLR3G2NgAFypSxUn5TL8%2FUWSyV2%2BgSPQ7NWiNrzUvmrIRO5ACU%2ByJZCR9azgFr2GhZAABKm8JAFOXSr%2BHgU95sn5ZL9sHkd2Kpy8e2AwVwa3so5NRX7o8Wtuji21tr7d07GlY9xWfqOHxROQ%2Fp3NhKQr%2BnJQdSthmh94%2B5S6cymCXpwJ65JWNtuyrJJM5f0EwB3Kz9L%2FG0w153NoM5dw7TztgAAYL1xICRo5aA%3D%3D|tkp%3ABk9SR7DzifrdYw
 

Offline mtwieg

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Re: Hobby BLDC ESC snsor connections
« Reply #1 on: April 21, 2024, 02:23:58 pm »
Actually I would expect five wires for the sensors, typically they need both GND and a supply voltage. Long ago I took apart some old BLDCs and found some with passive sensors (some had pickup coils, others seemed to have two-terminal magnetic sensors, maybe magnetoresistive?). But I would never expect to find exotic stuff like that in a toy ESC like this...
 

Online langwadt

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Re: Hobby BLDC ESC snsor connections
« Reply #2 on: April 21, 2024, 03:15:45 pm »
I'd expect the red-white-black to be for the RC-servo like pwm signal to control the ESC
 

Offline CirclotronTopic starter

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Re: Hobby BLDC ESC snsor connections
« Reply #3 on: April 22, 2024, 04:36:16 am »
Actually I would expect five wires for the sensors, typically they need both GND and a supply voltage.
Five wires... oh yeah, of course.
After looking a bit further I found an e-bike controller that should do just what I want. There are heaps of these available at very low prices. I just want to mess around on the bench with a motor that is about the size of a coke can.

https://www.ebay.com.au/itm/404922267506
« Last Edit: April 22, 2024, 04:39:02 am by Circlotron »
 

Offline mtwieg

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Re: Hobby BLDC ESC snsor connections
« Reply #4 on: April 23, 2024, 12:18:50 pm »
I'd expect the red-white-black to be for the RC-servo like pwm signal to control the ESC
You're right, it does look just like a RC servo pwm cable. But that makes no sense on a BLDC controller (unless it's used to control speed, not position).

Five wires... oh yeah, of course.
After looking a bit further I found an e-bike controller that should do just what I want. There are heaps of these available at very low prices. I just want to mess around on the bench with a motor that is about the size of a coke can.

https://www.ebay.com.au/itm/404922267506
Well that does have five wires for the sensors, at least. e-bike/e-scooter controllers like those are probably a good option, so long as you have decent documentation for them.
 

Online langwadt

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Re: Hobby BLDC ESC snsor connections
« Reply #5 on: April 23, 2024, 12:31:29 pm »
I'd expect the red-white-black to be for the RC-servo like pwm signal to control the ESC
You're right, it does look just like a RC servo pwm cable. But that makes no sense on a BLDC controller (unless it's used to control speed, not position).


plenty of bldc controllers with rc servo pwm interface for controlling speed
 


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