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enter image description here

enter image description here

Toggle switch connections

Potentiometer connections

Toggle Switch Connectionsenter image description here

I want a welding turntable able to turn 500 pound chunks of metal with room to spare. The vertical load with the table horizontal is no problem, it's when I went horizontal with material offset the centerline. ie. saddles, fittings and such, that I smoked the brushes and commutator on the $1800 turntable I had.

I told a vendor what I needed and showed them the speed controller I had, they matched up the motor, BLDC driver and power supply. I assumed matching the speed controller I already had.

I figured when I bought this it would come with wiring schematics, blue wire goes here, green wire goes there type of thing.

I tried hooking it all up , but I'm in over my head. I found a diagram for the controller that shows where to connect the motor to it which is how I was able to run the wires you see in pictures.

The motor to the controller shows yellow, green and blue to U V W, but my motor has yellow green and red. I connected the red to where it shows blue, just because it seems right.
Now I am not sure how to connect the speed controller, I'm stuck. Please help me.

  • How would I connect a toggle switch to change directions?
  • How do I control speed?
  • Would I be better off using a VFD?

PStechPaul has recently suggested I can probably apply voltage from a microcontroller DAC or filtered PWM, which really means nothing to me: still in the same boat, not knowing how to connect it.

A hyperlink was shared in the comments to a distributors' site that has good information on it.

Here is a link to a video of operation.

Trying to figure out why my BDLC isn't running in 2 directions

Diagram of BLDC driver connections: diagram of BLDC driver connections

Power Supply: Power Supply

Speed controller: Speed controller

Speed controller: Speed controller

Motor connections on motor controller: Motor connections on motor controller

Motor controller: Motor Controller

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  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$
    – Voltage Spike
    Dec 26, 2022 at 16:31
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    \$\begingroup\$ Is the sensor wiring correct? I would guess that Hu/Hv/Hw colours should match U/V/W. I don't think it matters if you swap the phases around (e.g. swap green and yellow). I do think it matters if the power wires don't match the sensor wires. \$\endgroup\$
    – user253751
    Jan 3, 2023 at 3:32
  • \$\begingroup\$ (@user253751: in the imgur post, there's an image of the sensor cable using the conventional colours connected correctly. On a welder's workbench.) \$\endgroup\$
    – greybeard
    Jan 3, 2023 at 5:24
  • \$\begingroup\$ (@user253751: I had the idea to change the 3 phase wires. Like on an AC motor, switch the legs and the rotation will change. Doesn't work that way.) \$\endgroup\$ Jan 3, 2023 at 7:58
  • \$\begingroup\$ it does work that way! BLDC motors are a kind of AC motor with the wrong label on purpose... don't ask... \$\endgroup\$
    – user253751
    Jan 3, 2023 at 8:10

2 Answers 2

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It looks like a simple potentiometer connected between COM and V+, with the wiper to Ve. There is also an enable input (EN) that is connected to COM. The pot might be between 2k and 10k, so 5k should be about right.

The diagram also shows connections from Hall effect sensors, H+, H-, Hu, Hv, and Hw. These would provide speed and position feedback. It will probably work OK without them. Otherwise, it will be necessary to contact the manufacturer of the controller and/or motor to obtain a compatible sensor module.

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  • \$\begingroup\$ If the speed controller I have was a potentiometer I would be golden. It's not though, what I have and is needed for the application, so it can be timed to go slower at first for a pre-set amount of time before it reaches it's maximum set value. The diagram shows 4 connections, I have 8 wires. I bought the controller, motor and power supply at the same time, but it came with no diagrams. I have had to find them. I told them what – \$\endgroup\$ Dec 26, 2022 at 6:33
  • \$\begingroup\$ I needed and showed them the speed controller I had, they matched up the motor, controller and power supply to the speed controller I already had. All I need to know is where to connect the 2-inverse limit wires, the 2 positive limit wires, where to put the + - wires for the motor, pretty sure the power wires come from the power supply. \$\endgroup\$ Dec 26, 2022 at 6:33
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    \$\begingroup\$ That controller is for a brushed DC motor, and cannot be used for a BLDC motor. I think all you need is a potentiometer, which you can purchase anywhere for a few dollars. If you need special functions like programmed time and speed, you can probably apply voltage from a microcontroller DAC or filtered PWM. \$\endgroup\$
    – PStechPaul
    Dec 26, 2022 at 7:03
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    \$\begingroup\$ Are you sure that one end of the potentiometer goes to COMMON, and the other end to V+, with the wiper arm to Ve? Use a DMM to check the voltage from V+ to COM, and from Ve to COM. As you rotate the pot from end to end it should vary smoothly from 0 to 12V or 24V. \$\endgroup\$
    – PStechPaul
    Jan 3, 2023 at 3:35
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    \$\begingroup\$ I am not sure of anything at this moment, heh. I just connected it the way the diagram showed. Yellow and red (com/DIR) is the only direction the motor will travel. I was told to take off the red jumper, I did, and it does the same thing. V+ to COM stays at 4.83 volts, Ve to COM is 0 to 4.83 volts (the motor is 5 volts). \$\endgroup\$ Jan 3, 2023 at 7:51
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I see no useful way to control a BLDC driver using the remote of a brushed DC motor speed controller.

That looks serious(ly costly) equipment:
2kWatts is a lot when there are ~20 W turntables.

That aside, you can try to use the speed controller's output to generate a signal for Ve:
Connect the BLDC driver's COM to the speed controller's 0V/GND/COM. I'd try a voltage divider 12 kOhms to motor+, two anti-serial 22 μF capacitors parallel 1.5 kOhms to COM - note that this may work for one direction, if that.

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  • \$\begingroup\$ No rigging. Being 100% sure they actually matched everything up to the speed controller I had and not having searched for better instructions until I had everything and started trying to wire it together, I never read that it was for a brushed motor. Boo, Nice catch. What would you suggest with similar functionality. Not sure a VFD will do it, will it? Fairly costly, about $695 for the 1.5kw motor the controller and a NMRV90 gear reducer, less than you would expect. This is supposed to be able to turn 500# with room to spare. I smoked the brushes and com. on the turntable I had, it was $1800. \$\endgroup\$ Dec 26, 2022 at 7:41
  • \$\begingroup\$ Laser, don't I wish, I weld production parts from my home on a 1099. No sir. 500# chunks of metal, vertical is no problem, it's when I went horizontal with material offset the centerline. ie. saddles, fittings and such. I tried to be more concise about what I needed at the top. Someone edited it. Would this work? I'd still need help wiring it I am sure. amazon.com/VIGELA-Universal-Frequency-Converter-Applicable/dp/… \$\endgroup\$ Dec 26, 2022 at 8:16
  • \$\begingroup\$ VFD's usually are for driving ASMs. \$\endgroup\$
    – greybeard
    Dec 26, 2022 at 8:21
  • \$\begingroup\$ That has been my problem. Thanks to you, now I know the speed control can't work. PStechPaul has recently suggested I can probably apply voltage from a microcontroller DAC or filtered PWM. Which really means nothing to me and would be in the same boat, not knowing how to connect it. \$\endgroup\$ Dec 26, 2022 at 9:05
  • \$\begingroup\$ apply [the] filtered PWM from your brushed motor controller is what I sketch in my answer. Going to try and suggest an edit to your question - will probably take about half an hour. \$\endgroup\$
    – greybeard
    Dec 26, 2022 at 9:11

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