BLDC VS FOC, a discussion

91

I use single drive a lot and dual drive some and I prefer BLDC on both.

92

For small single motors, will sensored BLDC be better for the torque or worse for the heat generated?

93

Compared to what, sensored FOC?

I build everything sensorless BLDC now after trying different ways, I like this one the best. Sometimes it a TINY hassle to start out on a hill but compared to the feeling that your board won’t fail because of a sensor issue, it’s well worth it. Sensorless becomes second-nature after a short time and you don’t even notice anymore.

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94

Just out of curiosity, how many motors have you had vs how many have had sensors fail?

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95

I’ve had about 25 motors and 3 sensor failures

But also I have stopped using them, so who knows how many of the ones I don’t use are failed :rofl:

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96

Brian, I am sorry but you don’t have hills in St. Louis :crazy_face:

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97

I am at the intersection of the two biggest rivers in North America, so yes this is a very low spot. However I live downtown and there are tons of parking garage ramps (even in my own building) and various other things that are far steeper than natural hills :wink:

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98

I am now imagining you doing this going up :rofl:

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99

We have a couple of those around here :wink:

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100

I live on the top of a hill with some lovely coast views. I can imagine with bindings you may experience some hassles especially with brakes that don’t lock. I can see that being more of a pain at intersections if you did have to put your foot down. For my riding environment though and boards I have never needed sensors. Its just something you get used to.

101

You can’t really push start a MTB, your feet are at very weird angles.
Also, usually off road, you may have footstraps which means you can’t put your foot down.
Depending on terrain there will be occasions where you will have to start on a steep hill.

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102

can’t help imagine the rocky horror time warp lyrics modified to hip flick hehe :smile:

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103

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104

That qualifies as a hill in my book :wink:

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105

Is the difference between sensored BLDC and unsensored big? I have always used unsensored, but after trying my friends sensored FOC setup, I kinda liked the smoother control. Or I should go full FOC to achieve that? (That I will not do :smile: )

106

No, the start up from standstill is exactly the same, the motors are cogging. The only difference is that you have better control at low RPM, that’s it.

My first esk8 was sensorless and I didn’t like to push first, that was very annoying. I have no idea why so many people like sensorless. I guess only because they have never tried sensored FOC :wink:.

For those who like BLDC mode because of the loud motor sound then there is a solution. Get APS motors and people gonna hear you in FOC :joy:.

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107

:thinking::face_with_monocle:

Going to verify that on my next ride :joy:

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108

I’ve heard from several people that APS motors are loud in FOC and I agree. On my commuter with APS people hear me from far away and turn around. With SK8 and helicals people (and dogs) never recognize me. I can ride 1 meter behind someone and need to say “excuse me” to pass :laughing:. Need a horn.

Here some evidence, SK8 in sensored FOC

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109

My problem is, that with chains my drive train is loud anyway. FOC or BLDC doesn´t matter at all chains top it all.

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110

I have a 5065 motor from APS and I run it in sensored FOC. Sadly, I have no experience in other motors.

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