The self-starting single phase synchronous motor without auxiliary windings has a permanent magnet diametrally magnetised rotor and a maximum theoretical natural load limit. This is increased by fully using the space for the copper windings without exceeding the permissible temperature of the windings. - Outside the motor there is permanently incorporated an ohmic resistance or capacitance or combination of both. The ohmic resistance is separated thermally from the motor, and can be ventilated. The ohmic resistance or capacitance or the two in series are in series with the excitation windings. EPAB- EP--79094 B A method of dimensioning a drive including a self-starting single-phase synchronous motor without auxiliary coil, which motor comprises a diametrically magnetised permanent-magnetic rotor and a stator provided with exciter coils and having a copper volume which is maximal for this motor and is dictated by its dimensions, which motor has a corresponding theoretical inherent maximum power (Pab,n) in the case of viscous load, which power is attainable if the motor is not overheated, observing thermal regulations, when the winding area is utilised completely and the winding data are varied, the dynamic maximum power or stalling power in the case of a non-viscous or partly viscous load being lower than the inherent maximum power of the motor, characterised in that in order to increase the dynamic maximum output power in the case of a non-viscous or partly viscous load the available copper volume is occupied only partly by turns of copper wire and theexciter coil is so designed that the power dissipation in the exciter coil just assumes the permissible value at which the permissible value at which the permissible coil temperature is not exceeded (Fig.1 Point 3), the increased maximum power being smaller than the inherent maximum power but being selected so as to be adequate for the specified driving requirements. (8pp) - EP--79094 B A method of dimensioning a drive including a self-starting single-phase synchronous motor without auxiliary coil, which motor comprises a diametrically magnetised permanent-magnetic rotor and a stator provided with exciter coils and having a copper volume which is maximal for this motor and is dictated by its dimensions, which motor has a corresponding theoretical inherent maximum power (Pab,n) in the case of viscous load, which power is attainable if the motor is not overheated, observing thermal regulations, when the winding area is utilised completely and the winding data are varied, the dynamic maximum power or stalling power in the case of a non-viscous or partly viscous load being lower than the inherent maximum power of the motor, characterised in that in order to increase the dynamic maximum output power in the case of a non-viscous or partly viscous load the available copper volume is occupied only partly by turns of copper wire and the exciter coil is so designed that the power dissipation in the exciter coil just assumes the permissible value at which the permissible value at which the permissible coil temperature is not exceeded (Fig.1 Point 3), the increased maximum power being smaller than the inherent maximum power but being selected so as to be adequate for the specified driving requirements.
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