Interpreting BLDC motor spec sheet

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SUMMARY

The forum discussion focuses on interpreting the specifications of a three-phase wye BLDC motor, specifically regarding terminal resistance and inertia. The terminal resistance is confirmed to be Rphase, with a value of 0.06 Ω, indicating it refers to the resistance of each winding in the three-phase configuration. Additionally, the discussion clarifies that load inertia is expressed in (kg cm²), which translates to (kg m²) in SI units, affecting the calculations of torque (T) and torque constant (Kt).

PREREQUISITES
  • Understanding of three-phase wye BLDC motor configurations
  • Knowledge of electrical resistance and its implications in motor performance
  • Familiarity with torque calculations and their relationship to inertia
  • Basic grasp of unit conversions between (kg cm²) and (kg m²)
NEXT STEPS
  • Research the impact of terminal resistance on BLDC motor efficiency
  • Study the relationship between inertia and torque in electric motors
  • Learn about the calculation of torque constant (Kt) for BLDC motors
  • Explore advanced topics in three-phase motor control techniques
USEFUL FOR

Engineers, motor designers, and students in electrical engineering who are involved in the analysis and application of BLDC motors will benefit from this discussion.

Controlnoob1
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Hi everyone, first time poster!

Im having trouble reading the spec sheet attached and want to confirm the values I am using for calculation of Tm and Te.

The 3 phase wye BLDC motor spec sheet lists

1. Terminal Resistance = R2ph = 0.06 Ω

So this is Rphase and not R(line to line)?

ie Rphase is the resistance of each winding/phase of the 3 phase wye network?

2. What is the correct unit of inertia since it affects both the units of Kt and torque T?

Load inertia is listed in (kg cm^2) ie in SI (kg m^2)

(kg m s^2) {dividing "kg m^2" by gravity g } makes sense since

"torque due angular acceleration T = angular acc * inertia"

Thank you for taking your time to read this!
 

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Controlnoob1 said:
So this is Rphase and not R(line to line)?
Yes, that is how I would interpret it.
 

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