Any advantage to higher voltage motors? | Eng-Tips

The most advantageous will be to use a motor that matches the available voltage.
In the US you may not find many 600 Volts supplies (for 575 Volt motors), while in Canada 600 Volts is a standard voltage.
There are still a lot of 480 Volt systems in Canada but for many years the utility standard has been 600 Volts. Some plants use 480 Volts but source it with their own transformers.
Some Canadian plants have dedicated 480 Volt systems for heat tracing only, not available for motors.
You won't easily find any 440 Volt, 60 Hz motors. The standard motor voltage is 460 Volts (for use on 480 volt systems).
For Canada, 575 Volt motors.
For the US and some Canadian plants, 460 Volt motors.

Bill
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"Why not the best?"
Jimmy Carter You can get more torque by increase the current or the amp turns. Higher voltage let you use thinner wire which you can use to create more turns when you wire the motor.

Higher voltages usually means the connection. To the grid is stronger.

Lower losses due to needing to draw less current to get the same torque.

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If you can't explain it to a six year old, you don't understand it yourself. Well, this is confusing...
So if I understand correctly, there shouldn't be any difference for small motors?
The autotransformer seems like a great option for us, I will check it out.
I was thinking of buying those AC to DC converters several of those will give me the output I need, but they do not have any 600V option.

Ron

Ron74 said: Any advantage to higher voltage motors?

The rule of thumb is when the motor Horse Power is higher than the voltage it is time to run the numbers on a higher voltage motor.
If your motors are less than about 500 HP each, don't worry about high voltage.
Also, in this instance when we talk about higher voltages we are talking about moving up from 480/600 Volts to Volts or more.
If you are comparing motors in the lab, you can quantify the slight possible difference between a 460 Volt motor and a 575 Volt motor but you are not doing a laboratory analysis. You, as I understand it, are selecting a motor to purchase.
MATCH THE MOTOR TO THE AVAILABLE VOLTAGE.
As an example; If you select a 575 Volt motor because of greater efficiency over a 460 Volt motor, you will need a transformer which will erase any savings in initial motor cost and running efficiency many times over.
The perceived advantage of a 600 Volt motor over a 460 Volt motor is a fine point.
The added losses of a transformer to run a 575 Volt motor with a 480 Volt supply is a GROSS point.
You mention a DC power supply and a 150 kW load as well as motors below 10 kW.
You may have unasked and unanswered questions in addition to motor voltage.
What are you designing/building?

Bill
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"Why not the best?"
Jimmy Carter As I said, I am in Canada and have a 600V supply to the plant.
I cannot find any 600V AC to DC converter so I will have to use a transformer. And this is a large part of the production costs, so I so should I invest more time on finding one or asking for a custom design?
I've read in another post somewhere that 575V motors are not common in industrial applications here, most of my experience is with the European voltage. 600V is used mostly for commercial application and municipal wastewater, I do not know if this true.
I will get on a later stage an electrical engineer to design, but I need to order the motors before. If the utility is supplying the transformer in Canada it will most likely be 600 Volts.
Smaller plants generally use the 600 Volts supplied by the utility.
Larger plant who typically buy their own transformer must decide what voltage to use.
I have worked in plants that were 600 Volts, plants that were 480 Volts, plants that were 600 Volts but also used 480 volts for specific equipment, and one plant that had about a 50/50 mix of 460 and 575 Volt motors and had both 600 and 480 Volts.
600 Volts is the standard.
480 Volts has a much greater range of available equipment from the US.
You should be asking us how to source your DC supply.
You should be finding out the supply voltage where your equipment will be used.

Bill
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"Why not the best?"
Jimmy Carter

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