Synchronous Motors 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 High start torque or peak load torque Able to accelerate high load inertia Lifetime High Only little reserve for peak load torque Can’t accelerate high inertia Speed range [rpm] 250…36000 Limited by bearings Depends on lateral force Efficiency 15…45% Depend on pole number and mains frequency Power vs. size Low Higher for 2-pole motor 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) Max.output power from JE [W] 14 Approximately, for short time duty cycle S2 Linear motors from JE Yes Shaded Pole Motors 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 Depends on lateral force Speed range [rpm] 2600 Rated speed at 50Hz Efficiency 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 Electromag.interference EMI Not Critical Braking/Holding torque Very Low No permanent magnets Max.output power from JE [W] Linear motors from JE No
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