Preliminary: I know basic model of DC motor which depends of two electric parameters such as voltage/rpm and current/torque. There are two models electrical - resistance, back EMF, and optional inductance of coils. On mechanical side there are torque, speed and optional moment of inertia.
Question: What is the real limit for maximum voltage/frequency applied to BLDC motor if motor will be powered by high range current source ? My presumption is that motor's mechanical construction is limited mostly for currend and torque and when higher rpms are needed then should be able to increase voltage/frequency of motor.
How it is with both case permament magnet or induction asynchronous motors? Why some datasheets of similar motors have different both nominal/maximum rpm and voltage specified?
To summarize last talk thanks to Gregory Kornblum
- Some motors have ratings 24 V and could operate for higher voltages. My assumptions:
- Controller current source has filtered signals before output rails such that only envelope is driving motor's phases.
- Bearings and mechanical construction of the motor is strong enough to handle high rpm.
- There are fast mosfets to handle phases currents.
Any further explanation/ideas or confirmation to the subject?