- #1
Yoni
- 65
- 1
Hi,
This is a general question:
Do the motor constants KV and KT stay constant at high current?
Thanks
This is a general question:
Do the motor constants KV and KT stay constant at high current?
Thanks
Motor constants at high current
In summary, the question is asking whether the motor constants KV and KT remain constant at high currents, and if not, what changes. The Wikipedia article on motor constants only mentions a linear relationship between torque and current, but doesn't address how this relationship changes at high currents. The person asking the question also clarifies that they are specifically asking about BLDC mode and the effects of stator size, material, and geometry on the relationship between torque and current.
- #2
berkeman
Mentor
- 67,062
- 19,893
Does the wikipedia article help at all?
https://en.wikipedia.org/wiki/Motor_constants
What changes with high motor current?
https://en.wikipedia.org/wiki/Motor_constants
What changes with high motor current?
- #3
Yoni
- 65
- 1
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)?
My question is if this linear relationship remains at ever increasing currents (and before the wires burn)?
- #4
berkeman
Mentor
- 67,062
- 19,893
You didn't address my question to you yet...
Also, which motor type(s) are you asking about? And why would the motor type make a difference?berkeman said:
- #5
metastable
- 514
- 53
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.
1. What are motor constants at high current?
Motor constants at high current refer to the physical properties of a motor that remain constant when the motor is operating at high current levels. These properties include the motor's torque constant (Kt), back electromotive force constant (Ke), and resistance (R).
2. Why are motor constants important at high current?
Motor constants are crucial for predicting the performance of a motor at high current levels. They can help determine the maximum torque that a motor can produce, as well as its efficiency and operating temperature. Motor constants also play a role in selecting the appropriate motor for a specific application.
3. How do motor constants change at high current?
At high currents, motor constants typically remain constant or may decrease slightly due to the increase in temperature. However, if the motor is pushed beyond its rated current, the motor constants may start to deviate from their expected values, which can affect the motor's performance.
4. What factors affect motor constants at high current?
The main factors that affect motor constants at high current include the motor's design and construction, the type of materials used, and the operating conditions such as temperature and load. Other external factors such as power supply quality and voltage fluctuations can also impact motor constants.
5. How can I measure motor constants at high current?
Motor constants can be measured using specialized equipment such as a dynamometer or a power analyzer. These instruments can provide accurate measurements of motor torque, speed, and power consumption, which can then be used to calculate the motor constants. It is important to ensure the accuracy of the measurements and take into account any external factors that may affect the results.
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