SCHNEIDER motor Germany SCHNEIDER model SCHNEIDER price

SCHNEIDER motors refer to low-power single-phase asynchronous motors powered by a single-phase AC supply (AC220V). These motors typically have two-phase windings on the stator and a standard squirrel-cage rotor. Different distributions of the two-phase windings on the stator and different power supply conditions can produce different starting and operating characteristics.

SCHNEIDER motor performance

Under-ring motor lubrication is an improved lubrication method, divided into under-ring oil lubrication and under-ring oil-air lubrication. When implementing under-ring oil or oil-air lubrication, lubricating oil or oil-air is injected from the inner ring of the bearing into the lubrication zone. Under the action of centrifugal force, the lubricating oil reaches the bearing lubrication zone more easily, resulting in better performance than conventional jet lubrication and oil-air lubrication, and allowing for further increases in bearing speed. The main factors affecting the high-speed performance of angular contact ball bearings are the increased centrifugal force and gyroscopic torque acting on the balls at high speeds. Increased centrifugal force increases friction between the balls and raceways, while increased gyroscopic torque causes sliding friction between the balls and raceways, intensifying bearing friction heat generation and thus reducing bearing life. To improve the high-speed performance of bearings, two methods are commonly used: one is to reduce the diameter of the balls, such as using the standardized 71900 series spindle bearings; the other is to use new ceramic (Si3N4) materials for the balls. Since the density of Si3N4 ceramic material is only 40% that of bearing steel, the high-speed performance of these bearings is significantly higher than that of all-steel bearings. Rolling bearings used on spindles require preload to suppress vibration and sliding during ball revolution and rotation at high speeds, and to improve shaft rotation accuracy. Preload methods mainly include constant position preload and constant force preload.

SCHNEIDER motor classification

In these motors, similar teeth and slots are distributed according to a specific pattern on the inner and outer surfaces of the stator and rotor cores. Torque is generated by utilizing changes in magnetic circuit reluctance caused by changes in the relative positions of the stator and rotor core teeth and slots. The rotor core is made of silicon steel sheets or soft magnetic materials. When one phase of the stator is energized, the rotor turns to the position where the magnetic circuit reluctance is minimal. When another phase is energized, the rotor turns to another position where the magnetic circuit reluctance is minimal, and the motor stops rotating. At this point, the rotor has turned through a step angle θb, where N is the number of operating beats for the rotor to turn through one tooth pitch, and ZR is the number of rotor teeth. Variable reluctance stepper motors have many structural forms. Stator cores can be single-section or multi-section; magnetic circuits can be radial or axial; and winding phases can be three-phase, four-phase, or five-phase. The step angle of variable reluctance stepper motors can be achieved at 1° to 15°, or even smaller. Accuracy is easy to ensure, and starting and operating frequencies are relatively high, but power consumption is higher and efficiency is lower. Hybrid stepper motors have stator and rotor core structures similar to those of variable reluctance stepper motors. The rotor has permanent magnets that generate a unipolar magnetic field in the air gap, which is also modulated by the teeth and slots of the soft magnetic material on the rotor. Hybrid stepper motors combine the advantages of both permanent magnet stepper motors and variable reluctance stepper motors, featuring small step angles, high precision, high operating frequency, low power consumption, and high efficiency.

SCHNEIDER motor protection

Motor coils are usually wound with very fine copper wire and have poor current-carrying capacity. When the motor load is heavy or the motor stalls, the current flowing through the coil increases rapidly, causing the motor temperature to rise sharply, which can easily burn out the copper windings. If polymer PTC thermistors are connected in series in the motor coil, they provide timely protection during motor overload, preventing the motor from burning out. Thermistors are usually placed near the coil so that they can sense temperature more easily, making protection faster and more effective. For primary protection, thermistors with higher voltage ratings, such as the KT250 type, are usually selected. For secondary protection, thermistors with lower voltage ratings, such as KT60-B, KT30-B, KT16-B, and chip-type motor thermistors, are usually selected.

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