I would like to ask for your guidance regarding the motor current setting under a specific torque condition.
Based on the motor datasheet,
I derived a linear torque–speed relationship and confirmed that, at a torque of 2928.86 gf·cm,
the motor is expected to operate at 444 rpm, requiring approximately 6.6784 A according to the calculation.
The assumptions and parameters used are as follows:
No-load speed: 5000 rpm
Rated speed: 4000 rpm
Rated torque: 0.063 Nm (642.86 gf·cm)
The derived relationship is:
n = A × T + B
where
A = −1.55556, B = 5000
At the target speed of 444 rpm, the estimated torque is:
→ 2928.86 gf·cm
The required current was estimated using the torque constant calculated from the rated condition:
Rated current: 1.7 A
No-load current (I₀): 0.3 A
Kt = 642.86 / (1.7 − 0.3) = 459.184 gf·cm/A
Using this value, the estimated current is:
I = (2928.86 / 459.184) + 0.3 ≈ 6.6784 A
However, when measuring the same motor using ST Profiler to obtain the Electrical Model and Mechanical Model, the result showed Imax = 1.38 Apk.
Please note that:
The actual motor drive board is EVSPIN32G4-DUAL.
ST Profiler does not support EVSPIN32G4-DUAL, so the Electrical and Mechanical Models were measured using X-NUCLEO-IHM16M1 instead.
Based on this, I would like to ask whether it is acceptable to set Max current to approximately 7 Apk in order to achieve 2928.86 gf·cm torque with this motor, or if there are any limitations or concerns from the motor or driver perspective.
Your advice would be greatly appreciated.
Best regards,
Pelino
