Please, can somebody help me. For a motor to have variable speed range from 1000- 4000 rpm is it better to couple VFD with standard 2.2kW 3-phase motor in a way:
-1400 rpm motor: run @140Hz which gives max about 4000 rpm (36Hz gives 1000rpm)? or
-2800 rpm motor: runa @ 70 Hz to have 4000 rpm, and 18Hz to have around 1000rpm
I heard that standard 3phase motor does not like too much Hz from VFD(no more than 60Hz???). I will need quite a lot of torque at low rpm
Which motor to go for?? Did somebody join Chinese VFD with a standard motor??