It will likely be a long time before anyone can actually measure these parameters to verify, but i'll take a shot at calculating them.
Why is this important or of any interest? Because these electrical characteristics are used in the calculations made by the inverter to drive the motor using a Direct Torque Control (DTC) scheme, described in patents and discussed in another thread.
For a 3-phase, 4-pole wye motor with the poles wired 2s2p, and with 4 Turns per pole using 16 AWG copper wire 12-in-hand:
phase inductance ~ 493 nH
phase resistance ~ 5.3 mR
This gives an L/R time constant of 93 usec. If we use 3 tc to reach full current, then the motor max speed ~ 26,858 rpm. With a 9.7:1 gearbox the theoretical max speed would be 228 mph.
For a P85D to reach 155 mph the motor(s) will need to spin at 18,200 rpm and make at least 50 kW each. The inverter would need to be generating a current waveform of 606 Hz, and the per phase L/R time constant would have to be less than 138 usec.
Send data when you get some...
Why is this important or of any interest? Because these electrical characteristics are used in the calculations made by the inverter to drive the motor using a Direct Torque Control (DTC) scheme, described in patents and discussed in another thread.
For a 3-phase, 4-pole wye motor with the poles wired 2s2p, and with 4 Turns per pole using 16 AWG copper wire 12-in-hand:
phase inductance ~ 493 nH
phase resistance ~ 5.3 mR
This gives an L/R time constant of 93 usec. If we use 3 tc to reach full current, then the motor max speed ~ 26,858 rpm. With a 9.7:1 gearbox the theoretical max speed would be 228 mph.
For a P85D to reach 155 mph the motor(s) will need to spin at 18,200 rpm and make at least 50 kW each. The inverter would need to be generating a current waveform of 606 Hz, and the per phase L/R time constant would have to be less than 138 usec.
Send data when you get some...
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