I was thinking about nameplate parameters of BLDC motors/PMSM and wondered what happens to those values if I operate the motor at a lower voltage as rated.
Are my following conclusions correct?
- If one reduces the voltage to the half of the nameplate value, Mr. Ohm tells us that the starting current is also halved. So I expect the starting torque to be halved as well. The same can be expected for the pull-out torque.
- If the voltage is halved I only can reach half of the rated speed without field weakening.
- The maximum power output is quartered because the voltage and the current are halved or the maximum speed and torque are halved.
Thanks for your help.