12 ms·
Simplicity and reliability. The rotor is completely inert (no windings). The big drawback has historically been "torque ripple". However, with modern high-sp
by pjkundert 14y ago
Simplicity and reliability. The rotor is completely inert (no windings).
The big drawback has historically been "torque ripple". However, with modern high-speed power electronics, the current to the windings can be modulated to counteract this.
Full torque at 0 RPM. An SR machine combined with efficient backlash-free reducing gearing (torque amplification) may be able to deliver the reliability and torque density to replace frictional brakes. The "holy grail" of a combined traction motor and braking system may be within reach.
- neya 14y agoThank you very much. Exactly what I wanted to know. But, just a doubt, even Induction motors offer full torque at 0 RPM, right? Please correct me if I'm wrong, because that's what a reviewer said while comparing a BMW and the Tesla Model S. Thanks!
- frankus 14y agoDepending on the control system, yes. If you run an induction motor off a fixed-frequency supply, it produces very little torque until it is spinning near it's synchronous speed (typically 3600 RPM, but depends on the supply frequency and pole multiplicity). That's why, for example, bench grinders can take forever to come up to speed. But modern control systems (which, I might add, are still much simpler than those for switched reluctance motors) can achieve full torque from a standstill (basically by bringing the synchronous speed to near zero).
- neya 14y agoThank you very much!