LAUER motor, Germany LAUER model, LAUER price

LAUER motor refers to a motor that, under standard environmental conditions, operates continuously at 100% rated load within the 10%~100% rated speed range, with temperature rise not exceeding the motor's specified allowable value. When the slip of an asynchronous motor does not change significantly, the speed is proportional to the frequency; thus, changing the power supply frequency changes the speed of the asynchronous motor. During variable frequency speed control, it is always desired to keep the main magnetic flux constant. If the main magnetic flux is greater than the flux during normal operation, the magnetic circuit becomes oversaturated, causing the excitation current to increase and the power factor to decrease; if the main magnetic flux is less than the flux during normal operation, the motor torque decreases.

LAUER motor protection device

Motor differential protection devices are mainly used in large high-voltage motors in power plants, chemical plants, and other locations. If a serious fault causes motor burnout, it will seriously affect normal production and cause huge economic losses; therefore, comprehensive protection must be provided. Existing integrated motor protection devices mainly target small and medium-sized motors, providing protection functions such as instantaneous overcurrent, thermal overload inverse-time overcurrent, two-stage definite-time negative sequence, zero-sequence current, rotor stall, excessive start time, and frequent starting. However, for extra-large capacity motors above 2000KW, they cannot meet the requirements for protection sensitivity and speed during internal faults. Therefore, this device was developed to work with integrated protection devices to provide more reliable and sensitive protection measures for high-voltage motors. This device is designed as a three-phase longitudinal differential protection because the 3KV, 6KV, and 10KV power grids where extra-large capacity motors above 2000KW are located may have transformer neutrals grounded via high resistance. Three-phase longitudinal differential protection serves not only as the main protection for phase-to-phase short circuits in the motor stator windings and lead wires but also as the main protection for single-phase ground faults, acting to trip instantaneously.

LAUER motor performance

Under-ring lubrication for motors 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 into the lubrication zone from the inner ring of the bearing. Under the action of centrifugal force, the lubricating oil reaches the bearing lubrication zone more easily, resulting in better performance than ordinary jet lubrication and oil-air lubrication, and further increasing the bearing speed. The main factors affecting the high-speed performance of angular contact ball bearings are the increased centrifugal force and gyroscopic moment acting on the balls at high speeds. Increased centrifugal force increases friction between the balls and raceways, while increased gyroscopic moment 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 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.

LAUER motor structure

The motor consists of stator poles, rotor, brushes, housing, and other components. Stator poles use permanent magnets (permanent magnet steel), including materials such as ferrite, AlNiCo, and NdFeB. According to their structural form, they can be divided into cylindrical and tile types, among others. The rotor is generally made of laminated silicon steel sheets, with enameled wire wound between the two slots of the rotor core (three slots mean three windings), and each joint is soldered to the metal segments of the commutator. Brushes are conductive components connecting the power supply to the rotor windings, possessing both conductivity and wear resistance. Permanent magnet motors use single-metal strip, metal-graphite, or electrographite brushes. 2. Brushless DC motor: Consists of a permanent magnet rotor, multi-pole winding stator, position sensors, etc. The characteristic of brushless DC motors is the absence of brushes; they use semiconductor switching devices (such as Hall elements) to achieve electronic commutation, replacing traditional contact commutators and brushes with electronic switching devices. It has advantages such as high reliability, no commutation sparks, and low mechanical noise. Position sensors commutate the current in the stator windings in a certain order according to changes in rotor position (i.e., detecting the position of the rotor poles relative to the stator windings, generating position sensor signals at determined positions, which are processed by signal conversion circuits to control the power switch circuit and switch winding currents according to a certain logical relationship). There are three types of position sensors: magnetic, photoelectric, and electromagnetic. For brushless DC motors using magnetic position sensors, magnetic sensing devices (such as Hall elements, magnetic diodes, magnetic transistors, magnetic resistors, or specialized integrated circuits) are installed on the stator assembly to detect changes in the magnetic field generated by the rotation of the permanent magnet rotor. Hall elements are commonly used in electric vehicles. For brushless DC motors using photoelectric position sensors, photoelectric sensing devices are configured at specific positions on the stator assembly, and a light-blocking plate is installed on the rotor, with the light source being an LED or a small bulb. As the rotor rotates, the light-blocking plate causes the photosensitive components on the stator to intermittently generate pulse signals at a certain frequency. For brushless DC motors using electromagnetic position sensors, electromagnetic sensor components (such as coupling transformers, proximity switches, LC resonant circuits, etc.) are installed on the stator assembly. When the position of the permanent magnet rotor changes, the electromagnetic effect causes the electromagnetic sensor to generate a high-frequency modulated signal (whose amplitude varies with rotor position). The operating voltage of the stator windings is provided by an electronic switch circuit controlled by the output of the position sensor.

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