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90V DC source for DC Motor

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jerryvdk

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Hi,
We have a DC motor which has a specification as follows
Rated Voltage : 90V
Rated current : 2.8A
Starting current : 45A

This will be running using a brused dc motor controller

Can anyone tell me an smps or an industrial converter from which i can get 90V DC. In normal cases we are buying directly from SMPS manufacturers like Meanwell, Siemens or schneider electric. But in this, no one has 90V DC SMPS.
Please suggest
 

Hi,

If the don´t have..
* why not buy an adjustable one?
* why not connect two 48V in series?

Klaus
 
Are you in the US/Canada/Mexico or other country where the nominal AC voltage is 120VAC?

If so, a full-wave SCR controller will provide the required VDC average voltage.
Vave = Vrms/1.11 or 108 volts at full conduction.

By adjusting the SCR firing angle you can get the required voltage.

Because in the old days, 1970s, the only way to control DC motors were with thyristors (transistors with a rugged enough SOA did not exist), that is the reason that oddball DC voltage was introduced.
 

KlausST said:
Hi,

If the don´t have..
* why not buy an adjustable one?
* why not connect two 48V in series?

Klaus
Click to expand...

We thought of using a panel mount off the shelf device.
Do you know anyone which has a panel mount device(Panel mount - not tabletop)

Yes, we can connect in series. But if there is any off the shelf device, we thought of using that.
 

A choke inductor reduces AC. This simulation has two chokes showing typical locations: one in the AC section, one after the diode bridge. (If preferred, use one choke only and make it a larger Henry value.)

2 chokes reduce mains AC 4 diodes smoothing cap load gets 90v 3A.png

Adjust values to obtain desired performance.

Power factor correction is a good idea (60 uF capacitor across supply). However it draws current whether load is attached or not.
 

You will need enough capacitance on the output of the SMPS to supply the 45A start-up current for enough time to get it running.
 

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