METHOD OF STARTING SYNCHRONOUS ENGINES WITH INCORPORATED MAGNETS (OPTIONS) Russian patent published in 2018 - IPC H02P1/46 H02P1/50 

FIELD: electrical engineering; power machine engineering.

SUBSTANCE: invention relates to the field of electrical engineering and power machine engineering and can be used for direct asynchronous start-up of synchronous motors with incorporated magnets. Method of starting synchronous motors with incorporated permanent magnets in the first variant consists in that, starting is carried out by direct inclusion of the stator winding into the network, then, under the action of an asynchronous torque, the rotor is accelerated to a subsynchronous speed, and the transition from the subsynchronous speed to the synchronous speed occurs due to the action of the synchronizing moment, in accordance with the invention, before starting, the rotor of the synchronous motor with the incorporated permanent magnets is momentarily locked, brought into short circuit mode, the current density in the stator windings and the short-circuited rods of the rotor is increased, that way heating the stator and the rotor, because of which the permanent magnets are demagnetized and their magnetic field is reduced, at this moment, the rotor is pulled out of breaking and a direct asynchronous start is performed with the maximum possible starting torque, while the temperature of permanent magnets decreases with the acceleration of the rotor, the magnetic field of the permanent magnet is restored and the synchronous motor with the incorporated magnets enters synchronism. Method of starting synchronous motors with incorporated permanent magnets in the second variant consists in that the starting is carried out by directly connecting the stator winding to the network, under the action of an asynchronous torque, the rotor is accelerated to a speed close to the synchronous one, and the transition from the subsynchronous speed to the synchronous speed occurs due to the action of the synchronizing moment, according to the invention, before starting, the synchronous motor with the incorporated permanent magnets is briefly subjected to external thermal action, thereby heating the stator and the rotor, due to heating, the permanent magnets are demagnetized and the magnetic field of the magnets is reduced, at this time, the external thermal effect is removed and a direct asynchronous start is made with the maximum possible starting moment, while the temperature of permanent magnets decreases with the acceleration of the rotor, the magnetic field of the permanent magnet is restored and the synchronous motor with the incorporated magnets enters synchronism.

EFFECT: technical result is achieved maximum possible starting torque, increased reliability and direct, uninterrupted acceleration of the synchronous motor with incorporated permanent magnets.

2 cl, 2 dwg