Winding connection method for derating symmetry steady-state operation of asynchronous machine
An asynchronous motor, steady-state operation technology, applied to asynchronous induction motors, electrical components, electromechanical devices, etc., can solve the problems of limiting the application range of asynchronous motors, immediately shutting down for inspection and maintenance, and not being able to shut down immediately, and achieving the design principle of scientific and reliable, Solve the effect of inoperability and convenient operation
Inactive Publication Date: 2013-04-03
QINGDAO UNIV
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Problems solved by technology
[0002] The currently widely used three-phase squirrel-cage rotor asynchronous motor has the characteristics of simple structure, reliable operation, and convenient maintenance. It is widely used in modern industrial production. The connection of the stator is completed inside the stator, and it is carried out according to the phase. The coil group is connected into a phase winding and then leads to two terminals. In this way, the three-phase asynchronous motor usually only has six terminals on the terminal board. Once the motor is assembled, the internal wiring of the stator cannot be used. Changes are made, so when the traditional motor winding fails due to the solidification of the motor stator coil connection, it cannot continue to run in a steady state, and must be stopped immediately for inspection and maintenance. This lack of flexibility limits the application range of asynchronous motors; In propulsion systems such as airplanes and ships driven by three-phase asynchronous motors that supply power, when the motor stator winding coil fails, if the faulty coil group and the other two-phase corresponding coil groups can be cut off immediately, the motor can be realized. Symmetrical steady-state operation with derating, which can solve the problem that the asynchronous motor in aircraft and ships and other devices cannot stop immediately when the stator winding fails; without changing the structure of the motor stator winding, only changing the The connection method enables the squirrel-cage rotor asynchronous motor powered by the frequency converter to operate symmetrically and steadily as a three-phase asynchronous motor with traditional rated capacity, and to achieve derated symmetrical steady-state operation when the motor stator winding fails. This kind of asynchronous motor is fault-tolerant Enhanced performance, improved operational flexibility and reliability, expanded application range
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Embodiment 1
[0014] In this embodiment, the number of pole pairs p is 1, and the number of stator slots is Z. 1 A three-phase squirrel-cage rotor asynchronous motor with a short distance ratio of 18 and a short pitch ratio β of 8 / 9; the number of slots per pole and phase of the stator q, The stator windings of the motor are connected into a three-phase asynchronous motor with three capacity levels; the slot pitch angle is α, Coil pitch is y 1 , The upper side of the coil in the 18 slots of the stator is represented by 1, 2, 3, ... 18, and the lower side is represented by 1', 2', 3', ... 18'; the coil sides 1 and 9', 2 and 10', ... 8 and 16', 9 and 17', 10 and 18', 11 and 1', ... 18 and 8' form 18 stator short-distance coils; the coil 1-9' under one pole is the same as that under the other pole The coils 10-18' at the position are reversely connected in series to form a coil group, and the two ends 1 and 10 of the coil group lead out the connecting wires, and the other 8 coil groups c...
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The invention belongs to the technical field of machine winding connection, relating to a winding connection method for derating symmetry steady-state operation of an asynchronous machine. The method comprises the following steps: firstly combining and connecting each winding coil positioned at the same spatial position under different poles of the stator of the asynchronous machine through a series-opposing connection manner into a coil assembly; then respectively leading the head and tail ends of each coil assembly out of a connecting wire; then connecting adjacent coil assemblies into each phase winding through a series-forwards connection manner by using the number of slots in each phase of each pole as a unit; forming a three-phase symmetrical winding; cutting coil assemblies where fault coils are and coil assemblies at corresponding positions of other two phases when the coils are in fault; and connecting the remaining coil assemblies in each phase into a three-phase symmetrical winding through a series-forwards connection manner so as to realize derating symmetry steady-state operation when the winding of the asynchronous machine is in fault. The method is scientific and reliable in design principle, simple and flexible in connection manner, wide in application range and convenient to operate, thereby improving the stability and reliability of asynchronous machine running.
Description
Technical field: [0001] The invention belongs to the technical field of motor winding connection, and relates to a method for making a squirrel-cage rotor three-phase asynchronous motor powered by a frequency converter operate in a derated symmetrical steady state when the stator winding fails, by changing the coil connection mode of the motor stator winding, in particular to a method Winding connection method for derated symmetrical steady-state operation of asynchronous motors. Background technique: [0002] The currently widely used three-phase squirrel-cage rotor asynchronous motor has the characteristics of simple structure, reliable operation, and convenient maintenance. It is widely used in modern industrial production. The connection of the stator is completed inside the stator, and it is carried out according to the phase. The coil group is connected into a phase winding and then leads to two terminals. In this way, the three-phase asynchronous motor usually only ha...
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IPC IPC(8): H02K17/16
Inventor 吴新振袁博强雷加坤张阳
Owner QINGDAO UNIV