Series DC Motor with Drive

[Drivesrock]

Hi All!

Anyone any experience with applying a dc drive to a series dc motor that didn't have one before?

Added complication is that there is an electrical brake also in series.

I can think of possible problems with discontinuous current and maybe should include a dc choke for current smoothing.

I normally work with shunt fields on dc motors so easier to control.

Thanks for any tips.

 

[Drivesrock]

No replies from anyone?

 

[waross]

I am wondering what is your present supply for the series motor and what is the application.
respectfully

 

[jde777]

I installed a 100Hp drive on a 100Hp series connected motor with no issues. It was on the backdrive on a centrifuge. Just be sure to get the polarities correct or no motor rotation .

 

[Drivesrock]

The application is a rotating drum and is currently fed from a constant dc supply (rectifier) or bateries. Speed is controlled by resistors in series with the armature that are shorted out by contactors.

 

[ScottyUK]

Most DC drives use an AC-fed controlled rectifier in a half-controlled or fully-controlled bridge configuration. If you are using a DC supply it's a chopper you will need. Best places to talk to might the light rail suppliers where a DC supply is fairly common.


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If we learn from our mistakes I'm getting a great education!

 

[Drivesrock]

Hi ScottyUK, thanks for the reply. Customer wants a variable speed drive and thereby eliminate the resistor banks and the constant dc source. My concern is the current waveform through the series brake circuit so I'm thinking about a dc choke to help smooth that out.

 

[pablo55]

I recently installed a DC drive on a 360 Hp series DC motor. This particular application was a hoist and it used a shunt brake. It worked quite well. I have seen this particular drive used with a series brake in several applications. It worked well in these applications as well. No choke was necessary the drive is designed to handle the currents seen in a series motor circuit.