LINK ===== https://bytlly.com/2sIItr
HDPoker donwload1. Field of the Invention
This invention relates to rotary electric motors and in particular to such motors used to drive compressors and the like.
2. Description of the Prior Art
In general, rotary electric motors have taken a wide variety of forms, one of the simplest being the generally bell-shaped housing having an interior generally cylindrical recess in which is mounted a rotatable cylindrical member constituting the rotor. An armature is mounted to a stationary inner surface of the housing so as to extend inwardly in spaced relationship to the surface and also has an outer surface disposed in spaced relationship to the rotor. Each of the end of the rotor, the armature and the stationary inner surface of the housing are adapted to cause end-on effects in the armature as the rotor is rotated relative to the armature. The armature, therefore, is in a three-phase-armature and the rotary electric motor is known as a three-phase-armature-rotor motor. Typically, a pair of such motors may be used on a single axle on a four-wheel vehicle to drive wheels at each side of the vehicle through a differential gear set.
Three-phase-armature motors of the general type described above have been widely used to drive compressors and the like since the relationship of the armature, rotor and stationary inner surface of the housing provides an efficient means of exciting the armature. However, such motors are subject to a number of disadvantages. First of all, while the efficiency of such motors is very high in comparison with other types of motors, it is still a relatively low efficiency motor by comparison with the electrical efficiency of other types of motors. For example, for a specific power output there is an improvement in efficiency of about 40% over a conventional DC motor and about 80% over a conventional AC motor. Thus, a well designed three-phase-armature-rotor motor of the general type described above provides a very high efficiency, i.e., rotational and torque output for a given power input, as compared to the more conventional types of motors.
In order to produce a high efficiency such motors the armature is excited with complex high frequency waveforms including choke windings for phase-doubling and phase-shifting, a technique which is used to make an armature used in a conventional DC motor to give the same power output with a given power input. Further, since the armature is positioned close to 0b46394aab