Synchronous Motors: Overview



Power supply AC Mains supply
Driver electronics need No  
Speed accuracy Low Effected by load torque
Speed at rated point about 2600 rpm at 50Hz
Speed control No
Position control No
Overloadablity / load inertia Low Little reserve to max.torque
Lifetime High Limited by bearings
Depend on lateral force
Speed range [rpm] 2600 Rated speed at 50Hz
Efficiency Low, about 20% At rated point (14% at ½ rated point)
Power vs. size Low
Winding thermal protection Possibly
Load sensing Medium Current rises with load, but less than DC mot
Stalling permissible Yes If winding designed for continuous duty cycle
Electromag.interference EMI Not Critical
Braking/Holding torque Very low No permanent magnets
JE brand Johnson Motor