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DIY Brushed DC Motor build

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DIY Brushed DC Motor build

Old 11-18-17, 06:15 PM
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Loker
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DIY Brushed DC Motor build

Hi all,

I’m studying electrical engineering at university and I’m working on putting together an electric bike for my senior project . I have an old brushed DC hub motor and three new rechargeable 12V lead-acid batteries that have a capacity of 15Ah each. I also have a bike frame that fits my hub motor and an ebike throttle I inherited from one of my dad’s old projects. I’ve looked extensively but I can’t find any specs on my motor online.

The thing I’m struggling with is I have no idea how to build a control unit between the batteries and the motor. I think a buck converter whose output voltage is somehow regulated by the position of the throttle might work but I have a strong feeling that there’s more to it than that.

Does anyone know of any resources detailing the typical circuitry between batteries and a brushed DC hub motor in the context of electric bikes?

Any and all replies are appreciated!

-Sean
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Old 11-18-17, 07:22 PM
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Doc_Wui
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Well, first step is to hook up a variable DC supply in the lab and measure your motor rpm vs voltage as proof of concept. Your mechanical engineering buddies must have a strobotac in their lab.
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