Need help identifying basic DC motor components

Using Arduino Motors, Mechanics, Power and CNC
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Hi all. I'm trying to understand a DC motor that I've pulled off of a car that belongs to the ABS pump.

I understand the general DC motor operation, but there are a few extra components on this motor that have confused me to no end.

These components are:

  1. an extra carbon brush, making 3 in total.
  2. An inductor coil.
  3. Two small unknown items that is blue(looks like a small ceramic piece)

The extra carbon brush really throws me off as I have no clue what its for. Also the two ceramic pieces that are soldered on are also confusing.

I've been trying to map out what the schematic for the motor is but it is also very confusing since it seems there's continuity between the base parts.

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What are we talking about? Take your pick.
Table of Contents

Here is the primary link.

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Please post a picture of the brush end, clearly showing all the brushes. Also, describe all the electrical connections to the motor.

Items 2 (inductor) and 3 (capacitors?) could be for electrical noise reduction, brush arc reduction, etc.

4

Ok I will do that.

5

Hi, @replicant89
Welcome to the forum.

If the third brush is closer to one of the other brushes, that is, not oriented 90degree to the other two, then this is a simple way of providing a higher speed from the armature.

Many "old" style windscreen wiper motors used to use this trick, to simplify wiring, also the technology of the day meant electronic speed control may not have been feasible.

Arching at the brushes was higher, and the "blue" components you believe could be capacitors, may be just that.
Can you see any writing on them.
Same reason for the inductor, to suppress noise and keep arching down.

https://www.reddit.com/r/Motors/comments/su89g7/do_you_know_where_i_can_get_information_about_two/

image
image1080×857 113 KB

Tom.. :grinning: :+1: :coffee: :australia:

1 Like
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So I dugged and found how this motor works a bit more. But still not enough knowledge to fix the motor.

This motor has three brushes. The extra brush is to handle the extra current when it operates at full speed. The car hybrid system switches between two relays when it wants to run in low or high speed mode.

My issue is, I still don't understand the basic schematic of how this is all wired together. All of the components being connected to a base plate makes it all even more confusing to understand.

  • how would the two capacitors be connected?
  • how would the inductor be wired? Does it come before or after the negative wire?
  • how do I identify the positive or negative lead, and does that even matter?

I had removed on of the brushes and did a bad job of connecting the wire to the plate again and it had burned. One of the leads had also burned.

Imgur

I just don't know what my options are anymore. This motor came off of a hybrid car. And without it, the car will not run. The car also needs an accumulator to be replaced, and there's also very little info on how to fix that part, aside from buying a new unit.

7

Hi,
Can you please post some pictures of the motor?
So we can see what you are talking about.

Thanks.. Tom.. :grinning: :+1: :coffee: :australia:

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3024×4032 1.23 MB

3024×4032 1.24 MB

3024×4032 1.18 MB

3024×4032 1.2 MB

3024×4032 1 MB

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