1400 HP Mustang

[svauto-erotic855]

This is entirely wrong.

Really? Prove it. I work with electric motors every day and have also worked with them in an industrial setting. Today I'll be working on an electric motor that is 1300 horsepower at 3450rpm.

Edit: The advantage of an electric motor is that the torque curve is nearly completely linear. There are some outside factors that can change that. For example most electric cars switch the motor on and off via pulse-width modulation as a way of throttling the motor. Throttling it through limiting current is also another method.

[Ruffdaddy]

Really? Prove it. I work with electric motors every day and have also worked with them in an industrial setting. Today I'll be working on an electric motor that is 1300 horsepower at 3450rpm.

Edit: The advantage of an electric motor is that the torque curve is nearly completely linear. There are some outside factors that can change that. For example most electric cars switch the motor on and off via pulse-width modulation as a way of throttling the motor. Throttling it true limiting current is also another method.

You service pool equipment, I design electromechanical systems that actually require me to fully understand torque delivery and much more complex factors.

I've written code to define PWM, but lets be clear that was you deflecting from your incorrect statement on torque being the EXACT SAME at every point in the operating range.

Here's a link to Teslas torque vs Speed curve:

https://electrek.co/2017/11/20/teslas-next-gen-roadster-technical-analysis/

Here's an article about simple DC motors and their torque vs RPM Curve.

http://lancet.mit.edu/motors/motors3.html

Stepper motor torque vs rpm curves:

https://www.orientalmotor.com/stepper-motors/technology/speed-torque-curves-for-stepper-motors.html

Its very likely the equipment you work with has a much narrower RPM band than electric vehicles and a lot of other applications. You are in a thread about electric vehicles...not narrow band pumps.

[BLAKE]

Man, what a perfect storm we're witnessing. SVO is apparently wrong about something (I don't know jack about electric motors) and Ruff is getting to flex his engineer brain and even citing sources.

I think we can all agree the only way this can be resolved is a Thunderdome style death match.

[BigDumbRedneck]

I think we can all agree the only way this can be resolved is a Thunderdome style death match.

Abbott said that Thunderdome opens back up on Friday. Sounds like a GTG.

[svauto-erotic855]

You service pool equipment, I design electromechanical systems that actually require me to fully understand torque delivery and much more complex factors.

I've written code to define PWM, but lets be clear that was you deflecting from your incorrect statement on torque being the EXACT SAME at every point in the operating range.

Here's a link to Teslas torque vs Speed curve:

https://electrek.co/2017/11/20/teslas-next-gen-roadster-technical-analysis/

Here's an article about simple DC motors and their torque vs RPM Curve.

http://lancet.mit.edu/motors/motors3.html

Stepper motor torque vs rpm curves:

https://www.orientalmotor.com/stepper-motors/technology/speed-torque-curves-for-stepper-motors.html

Its very likely the equipment you work with has a much narrower RPM band than electric vehicles and a lot of other applications. You are in a thread about electric vehicles...not narrow band pumps.

Because I have an actual degree in engineering I do warranty work for several pump and motor manufacturers. The big honkin pump I'm working on today is in a water treatment plant and it's basically used to stir shit.

From zero to their peak operating RPM the torque curve is as close to linear as can be when compared to a regular engine.

You are correct, the majority of the electric motors that I work on operate at a fixed RPM or are 2 to 4 speeds. Typically the ones that have a infinitely variable RPM range are on lifting equipment.

[Ruffdaddy]

.
...
(1)...From zero to their peak operating RPM the torque curve is as close to linear as can be when compared to a regular engine.

(2) You are correct...

(1) linear isn't remotely the same thing as "exact same torque at every point in their operating range".

(2) no shit.

[garycrist]

Everyone is kind of right except, PWM!

PWM is now king! Like 3 phase DC.

[svauto-erotic855]

(1) linear isn't remotely the same thing as "exact same torque at every point in their operating range".

(2) no shit.

Linear can mean two things. I'm using the first definition that comes up in a Google search, you're using the second.

[Ruffdaddy]

Linear can mean two things. I'm using the first definition that comes up in a Google search, you're using the second.

No you aren't and this is another attempt to dodge from the fact that your constant torque statement is completely wrong.

[BLAKE]

Two men enter, one man leaves!

[dsrtuckteezy]

I'm backing SVO. He seems cooler to party with... Just sayin'

[Ruffdaddy]

I'm backing SVO. He seems cooler to party with... Just sayin'

That's exactly what I'd expect someone to say that had to be rescued by the real men on his little moped ride.

At least you know you can't handle the heat baby!

[dsrtuckteezy]

That's exactly what I'd expect someone to say that had to be rescued by the real men on his little moped ride.

At least you know you can't handle the heat baby!

quiet down, city boy...

[svauto-erotic855]

No you aren't and this is another attempt to dodge from the fact that your constant torque statement is completely wrong.

https://www.google.com/search?q=linear&oq=linear&gs_l=mobile-heirloom-hp.12..0l5.5541.5541.0.6302.2.1.0.1.1.0.197.197.0j1.1.0....0...1c..34.mobile-heirloom-hp..0.2.292.uvtpe3MJWBA

The examples of motors that you gave with variable torque were all examples of motors it had variable power input.

Take a motor, supply it whatever voltage that it runs on from an effectively infinite power source without manipulating it and you'll see that all motors have the same torque throughout their RPM range. There will be subtle variances in that torque but it is a very small differences.

Edit: I don't doubt that you know more about electrical motors than I do. I do not design them, I do not design the systems that they are operating in. What I do is on new installs verify that the product installed is working to spec and that it was sized appropriately for the application. For older systems I diagnose and troubleshoot problems, decide if failures are covered under warranty and perform some repairs. It is not my main gig, I stumbled into it because I have a good working relationship with the local Pentair and AO Smith reps.

[Ruffdaddy]

https://www.google.com/search?q=line...92.uvtpe3MJWBA

The examples of motors that you gave with variable torque were all examples of motors it had variable power input.

Take a motor, supply it whatever voltage that it runs on from an effectively infinite power source without manipulating it and you'll see that all motors have the same torque throughout their RPM range. There will be subtle variances in that torque but it is a very small differences.

Dude you're a nutless coward. Stop running away from what you said.

You said exact same torque across the entire operating range...not linear. You explained a flat or horizontal torque curve. Drop the fucking deflection and admit you learned something today.

Something can be linear and trend from 100 ft-lb to 5 ft lb. You didn't say that.