Is the torque constant of a DC motor the same regardless of voltage?

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The torque constant (Kt) of a DC motor is generally considered to remain constant regardless of supply voltage, as it is defined as the ratio of torque to current. However, the actual performance can vary based on the motor's field type, such as permanent magnet or wound field, which affects the flux (Φ) and consequently Kt. When voltage increases, the torque-current relationship shifts, but Kt itself remains unchanged for permanent magnet motors, while it may vary for others. Measuring Kt accurately requires consideration of armature reaction and the potential for high starting currents, which can distort readings. Proper experimental setup, including current limiting and gearhead attachment, is crucial for obtaining reliable measurements.
  • #61
What is the relation of Kt and Ke in BLDC motor?
How to find it?
Also how to find R, L of motor?
What is the setup suitable for in finding Kt .
I want to find the transfer function of BLDC motor for simulation.
How to find the value of B and J ?
Photo is attached herewith.
Inwheel motor.jpg
In-wheel Motor.jpg
 

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