DC power circuit

Matt Lanni's picture

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Joined: Feb 23, 2021

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DC power circuit
February 23, 2021 - 2:28am

Please can someone help!!   I have to use 2 speed controllers into one dc electric motor. 48 volts, 1000w, running up to 40 amps. I have to use a diode on each motor cable out of the controllers. What type do I use and how do I wire it up. Sorry, I'm a total numpty. 

Sourav Gupta's picture

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Joined: Feb 12, 2018

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How the motor speed is controlled now without two speed controller? what type of control signal it supports?

Harry's picture

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Joined: Feb 15, 2021

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The NTE6045 is rated at 60 amperes. It has a forward voltage drop of 1.4 volts at 60 amperes for your application  itis perhaps 1 volt so you would have 40 amperes * 1.0 volt = 40 watts.

So you would need a heat sink and heat sink compound. Perhaps:

https://www.ebay.com/itm/TO-220-HEAVY-DUTY-TRANSISTOR-HEAT-SINK-AAVID-63...

if that is to large use the largest one you can fit in.

I take this one to be a 6045:

https://www.ebay.com/itm/60-AMP-1000V-NEGATIVE-ANODE-CASE-STUD-MOUNT-DIO...

If that url does not work search for: "60 AMP 1000V NEGATIVE ANODE CASE STUD MOUNT DIODE" on ebay for an example.

I can find no way to upload a drawing to this forum. The anode is at the stud so the stud would connect towards the postive lead of the controllers. You should connect only one and try that to make sure you have it connected correctly. Ihis is only my advice; beware of free advice on the internet!

 

Matt Lanni's picture

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Joined: Feb 23, 2021

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One controller uses a twist throttle, the other a potentiometer. Have used 2 diodes in parallel just on the neg output of each controller (any other configuration doesn't seem to work) but they smoke badly when under load. They're 10 amp 50v each. 

Sourav Gupta's picture

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Joined: Feb 12, 2018

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40amp is a very high current. There must be some low voltage low current control signal. How there speed is controlled. How many wires are connected with the motors? If it is connected with some controller does it take control signals?