Hello,
I am looking for a battery for a 70 kW BLDC motor. I want to be able to change the torque and speed of it. I understand that it is possible to vary the speed with the current frequency and the torque with the current amount. Does that mean that if I operate this motor manipulating the voltage but not the frequency am I going to be able to change the torque but not the speed? I want to know it because we don't need the full nominal performance of the engine at 70kW. Its nominal magnitudes are 420Vdc, 240A, 850Nm torque and 786 rpm speed. What should I do if I want to drive it at 425 Nm and same speed?
Best regards,
Jorge
V=Eb+IaRa, E=OZNP/60A, with constant field(constant field flux(O), though Eb the function of speed, Ra could be varied by providing extra resistance, to control Ia the armature(stator) current to adjust the torque needed......
If you drive this motor as sensor based (A,B and C sensors), the speed is related to the frequecy of switching the proper sequence based on sensor input / or rotor position if sensorless drive.
The toruque could be controlled directly of indirectly. You can find many research paper related to that.
Thank you very much for your responses. It is a big help for my projects. I am learning a lot and I think it is going well thanks to you too.
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