Automotive Motor constants at high current

AI Thread Summary
Motor constants KV and KT do not remain constant at high currents due to the effects of magnetic saturation. As current increases, torque typically increases linearly with stator current until saturation occurs, after which the relationship becomes non-linear. The extent of saturation depends on factors like stator size, material, and geometry. Larger stators can handle higher currents before reaching saturation. Understanding these dynamics is crucial for optimizing motor performance under varying load conditions.
Yoni
Messages
65
Reaction score
1
Hi,

This is a general question:

Do the motor constants KV and KT stay constant at high current?

Thanks
 
Engineering news on Phys.org
Not helping. In wikipedia they only state a linear relationship between torque and current.

My question is if this linear relationship remains at ever increasing currents (and before the wires burn)?
 
You didn't address my question to you yet...
berkeman said:
What changes with high motor current?
Also, which motor type(s) are you asking about? And why would the motor type make a difference? :smile:
 
My understanding is for a given KT in BLDC mode, the torque increases roughly linearly with stator current until the stator reaches magnetic saturation (depending on stator size, material, geometry), at which point, the torque per amp begins to taper off in a "non-linear" fashion. Generally larger physical size stators can handle more current before saturating.
 

Thread 'Bubble formation in 4 mm gap vessel'

How did you find PF?: Via Google search Hi, I have a vessel I 3D printed to investigate single bubble rise. The vessel has a 4 mm gap separated by acrylic panels. This is essentially my viewing chamber where I can record the bubble motion. The vessel is open to atmosphere. The bubble generation mechanism is composed of a syringe pump and glass capillary tube (Internal Diameter of 0.45 mm). I connect a 1/4” air line hose from the syringe to the capillary The bubble is formed at the tip...
View full post »
Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Scenario 1 (figure 1) A continuous loop of elastic material is stretched around two metal bars. The top bar is attached to a load cell that reads force. The lower bar can be moved downwards to stretch the elastic material. The lower bar is moved downwards until the two bars are 1190mm apart, stretching the elastic material. The bars are 5mm thick, so the total internal loop length is 1200mm (1190mm + 5mm + 5mm). At this level of stretch, the load cell reads 45N tensile force. Key numbers...
View full post »

Thread 'Find 3D Printer & Software Resources for Prototype Creation'

I'd like to create a thread with links to 3-D Printer resources, including printers and software package suggestions. My motivations are selfish, as I have a 3-D printed project that I'm working on, and I'd like to buy a simple printer and use low cost software to make the first prototype. There are some previous threads about 3-D printing like this: https://www.physicsforums.com/threads/are-3d-printers-easy-to-use-yet.917489/ but none that address the overall topic (unless I've missed...
View full post »

Similar threads

Snail Fan Motor High Current Issue
Replies
13
Views
2K
Why Is the Moment of Inertia Not Constant in Motion Control?
Replies
9
Views
1K
Automotive Motor for slider crank
Replies
3
Views
108
How to Measure Torque Required for motor to spin a rotating shaft?
Replies
3
Views
4K
What are the key considerations for selecting a motor for a cam mechanism?
Replies
3
Views
2K
Calculating KV for BLDC Motor Re-Winding with Different Wire Materials
Replies
16
Views
4K
How to spec a motor for this floor testing system?
Replies
10
Views
2K
Motor Sizing for Wheel Endurance Testing
Replies
4
Views
2K
Trying to calculate motor kW/reduction drive for lift of 100kg at 0.8m /sec
Replies
5
Views
2K
Generator start-up torque
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top