초록 ▼

An electric device for driving a rotatable mass having a high inertia, said device comprising an electric motor supplied with power by a low-voltage dc source through an electronic energy converter supplying power to the armature (11) of the motor; the field system of the motor (12) comprises magnet

An electric device for driving a rotatable mass having a high inertia, said device comprising an electric motor supplied with power by a low-voltage dc source through an electronic energy converter supplying power to the armature (11) of the motor; the field system of the motor (12) comprises magnets (14) and excitation coils (16), the electric conductor of a coil being wound around its pole piece (18) along surfaces parallel to the corresponding yoke portion (19); this device further comprises an electronic system for regulating the current in the coils (16) and capable of maintaining during accelerations and decelerations a maximum output voltage of the converter within a wide range of speeds and therefore a maximum power; the increase in the intensity of the current in the coils (16) progressively decreases the torque coefficient of the motor which is maximum when the coils (16) are not supplied with power.

대표청구항 ▼

An electric dc motor for driving a rotatable mass having a high inertia, comprising: (a) an electric motor having an armature (11) and a field system (13), said field system comprising at least two pole pieces (18) each including one permanent magnet (14) and one excitation coil (16), each magnet pr

An electric dc motor for driving a rotatable mass having a high inertia, comprising: (a) an electric motor having an armature (11) and a field system (13), said field system comprising at least two pole pieces (18) each including one permanent magnet (14) and one excitation coil (16), each magnet providing a first source of magetic energy and each excitation coil providing a second source of magnetic energy, (b) each excitation coil and its associated magnet being disposed one above the other between a yoke (19) and an axis of the motor such that both the first and second sources of magnetic energy produce a resultant magnetic energy which simultaneously acts on a same portion of the armature, (c) each excitation coil having an electric conductor wound around an associated pole piece and along surfaces parallel to an adjacent portion of the yoke to create a magnetic induction in a direction opposed to the direction of the magnetic induction of its associated magnet, (d) means for producing a unidirectional field current in said excitation coils, and (e) electrical energy converter means for supplying electrical power to said armature such that an increase in the magnitude of said unidirectional current progressively decreases the torque coefficient of the motor which is maximum when said coils are not supplied with current.