THK motor Germany THK model THK price

The THK motor has a set of adjustable eccentric weights installed at each end of the rotor shaft, utilizing the centrifugal force generated by the high-speed rotation of the shaft and eccentric weights to obtain excitation force. Vibration motors have a wide vibration frequency range; only when the excitation force and power are properly matched can mechanical noise be reduced. Vibration motors have six classifications, such as by starting and operating mode, and by operating speed.

THK motor structure

The motor consists of stator poles, rotor, brushes, housing, etc. The stator poles use permanent magnets (permanent steel), including materials such as ferrite, AlNiCo, and NdFeB. According to their structural form, they can be divided into cylindrical type and tile type, 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. The brush is a conductive component connecting the power supply and the rotor winding, possessing both conductivity and wear resistance. Brushes for permanent magnet motors use single-metal strips or metal graphite brushes, and electrographite brushes. 2. Brushless DC motor: Consists of a permanent magnet rotor, multi-pole winding stator, position sensors, etc. The characteristic of the brushless DC motor is being brushless, using semiconductor switching devices (such as Hall elements) to achieve electronic commutation, i.e., replacing traditional contact commutators and brushes with electronic switching devices. It has advantages such as high reliability, no commutation sparks, and low mechanical noise. The position sensor commutates the current in the stator windings in a certain order according to changes in rotor position (i.e., detects the position of the rotor poles relative to the stator windings, generates position sensing signals at determined positions, processes them through signal conversion circuits to control the power switch circuit, and switches the winding current 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, the magnetic sensing devices (such as Hall elements, magnetic diodes, magnetic transistors, magnetic resistors, or specialized integrated circuits) are mounted 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 mounted on the rotor, with the light source being an LED or a small bulb. When the rotor rotates, due to the action of the light-blocking plate, the photosensitive components on the stator will 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.

THK motor maintenance methods

Motor maintenance and repair center motor maintenance process: Clean stator and rotor → Replace carbon brushes or other components → Vacuum F grade pressure impregnation → Drying → Dynamic balance correction. 1. The operating environment should be kept dry frequently, the motor surface should be kept clean, and the air inlet should not be obstructed by dust, fibers, etc. 2. When the thermal protection of the motor operates continuously, the cause of the fault should be identified as coming from the motor itself, overload, or too low setting value of the protection device. The motor can only be put into operation after eliminating the fault. 3. Ensure good lubrication of the motor during operation. Generally, after about 5000 hours of motor operation, lubricating grease should be replenished or replaced. If bearing overheating or grease deterioration is found during operation, replace the lubricating grease in time. When replacing lubricating grease, remove the old lubricating oil, clean the bearing and the oil groove of the bearing cover with gasoline, and then fill the cavity between the inner and outer rings of the bearing with ZL-3 lithium-based grease to 1/2 (for 2 poles) and 2/3 (for 4, 6, 8 poles). 4. When the bearing life ends, the vibration and noise of the motor operation will increase significantly. Check the radial clearance of the bearing; when it reaches the following values, the bearing should be replaced. 5. When disassembling the motor, the rotor can be removed from either the shaft extension end or the non-extension end. If it is not necessary to remove the fan, it is more convenient to remove the rotor from the non-shaft extension end. When pulling the rotor out of the stator, care should be taken to prevent damage to the stator windings or insulation. 6. When replacing windings, the original winding form, dimensions, number of turns, wire gauge, etc., must be recorded. If these data are lost, they should be obtained from the manufacturer. Arbitrary changes to the original design windings often degrade one or several performance characteristics of the motor, or even render it unusable.

THK 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, the 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 effects than ordinary jet lubrication and oil-air lubrication, and can further increase the bearing speed. The main reasons 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) material for the balls. Since the density of Si3N4 ceramic material is only 40% of that of bearing steel, the high-speed performance of this type of bearing is significantly higher than that of all-steel bearings. Rolling bearings used on spindles require preload to suppress vibration and sliding of ball revolution and rotation during high-speed rotation, and to improve shaft rotation accuracy. Preload methods mainly include constant position preload and constant force preload.

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