Induction motor rotor slot shape

Conclusions In this paper it has been described a strategy to parameterise geometrically the rotor slot shape. It has been applied on a large double-squirrel cage induction motor in order to seek to improve. Sensorless control induction motor rotor slot shapes and fabrication methods Family Applications Before (3) Application Number Title Priority Date Filing Date;. magnitude whenthe motor possesses different geometrical rotor-slot REVIEWPOKER.INFO cross sectional areas of two induction motors, Proc. the 24th IASTED.

Induction motor

Slots and can optionally have respective side surfaces and with different angles with respect to inner slot surfaces and If compound dies are used to simultaneously punch all rotor slots in a lamination, no special fixtures are needed. Since no VF is res trained, the material boundary. In the redesign of the motor lines to EFF1, direct substitution of copper for aluminum was found to meet the objectives for the smaller motors while the larger motors were entirely redesigned to best utilize the copper. A method for fabricating an induction motor rotor, the method comprising: Permanent magnet-excited assembly of an electrical machine, and process for its manufacture.

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Optimization of Motor Rotor: Slot Shape, Frame Size, Rotor Diameter

There has been, in recent years, an effort to make cast copper rotors for industrial use induction motors. The objective is to make motors more efficient because of the higher conductivity of copper. In addition, the reduced losses in such motors may lead to better design flexibility and therefore motors that are more compact. In this paper we examine the tradeoff between running efficiency and starting performance.

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In order to understand how induction motors work it is necessary to have a good model for the conduction properties of the conductors in the slots of the rotor. We employ a simple model that has been developed for this purpose. We propose to examine the frequency response of the rotor bar impedance for indications of how the motor will work, taking into account not only running efficiency and starting performance but also stray load losses which are also affected by rotor bar impedance.

The characteristic curve with higher resistance would, for all load torques, operate at a somewhat lower running speed and hence higher slip and lower efficiency than the machine with the lower resistance. On the other hand, starting torque is lower for the low resistance rotor and this might lead to unsatisfactory performance in some applications.

The use of copper as the conductor of induction motor rotors would typically lead to improvements in efficiency, relative to motors using aluminum. This is often done in large motors in which squirrel cages are fabricated from bars of material brazed to end rings. In such machines it is common to employ 'starting' bars of higher resistivity material.

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An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. Three-phase squirrel-cage induction motors are widely used as industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans.

Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives VFDs in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive VFD applications.

By manually turning switches on and off, Walter Baily demonstrated this in , effectively the first primitive induction motor. The first AC commutator-free three-phase induction motors were independently invented by Galileo Ferraris and Nikola Tesla , a working motor model having been demonstrated by the former in and by the latter in Tesla applied for US patents in October and November and was granted some of these patents in May In April , the Royal Academy of Science of Turin published Ferraris's research on his AC polyphase motor detailing the foundations of motor operation.

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Scott was assigned to assist Tesla and later took over development of the induction motor at Westinghouse. Lamme developed a rotating bar winding rotor. Induction motor improvements flowing from these inventions and innovations were such that a horsepower induction motor currently has the same mounting dimensions as a 7. In both induction and synchronous motors , the AC power supplied to the motor's stator creates a magnetic field that rotates in synchronism with the AC oscillations.

Whereas a synchronous motor's rotor turns at the same rate as the stator field, an induction motor's rotor rotates at a somewhat slower speed than the stator field. The induction motor stator's magnetic field is therefore changing or rotating relative to the rotor. This induces an opposing current in the induction motor's rotor, in effect the motor's secondary winding, when the latter is short-circuited or closed through an external impedance.


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