Synchronous Motors: Overview
Power supply | AC | |
---|---|---|
Driver electronics need | No | |
Speed accuracy | High | Not effected by load torque No closed loop speed control need |
Speed control | No | Not possible Speed fixed by mains supply frequency |
Position control | No | Not possible Only by limit switches |
Overloadablity / load inertia | Low | Only little reserve for peak load torque Can’t accelerate high inertia |
Lifetime | High | Limited by bearings Depends on lateral force |
Speed range [rpm] | 250…3600 | Depend on pole number and mains frequency |
Efficiency | 15…45% | |
Power vs. size | Low | |
Winding thermal protection | No need | Inductance protected (if winding designed for 100% duty cycle) |
Load sensing | Difficult | Load has little impact on current |
Stalling permissible | Yes | If winding designed for continuous duty cycle |
Electromag.interference EMI | Not Critical | No brushes |
Braking/Holding torque | Low | Detent torque (when power switched off) |
Linear motors from JE | Yes | |
JE brand |