July 6, 2023

Bearing Wear of Gear Motors and Causes of Bearing Overtightness

It is not difficult to find that the rapid development of magnetic sensors in the past two years has caught the attention of the industry. The number of magnetic sensor manufacturers in the international and domestic markets of geared motors is increasing sharply. In fact, in the field of sensors, not only new MEMS sensors, but also the traditional magnetic sensor market is also developing rapidly. According to iSuppli’s forecast, the magnetic sensor chip market will experience strong demand from automotive, industrial and consumer applications in 2010. The market revenue is estimated to increase from US$821 million in 2009 to US$1.4 billion in 2013; in terms of shipments, it will increase from 2.8 billion in 2009 to more than 5 billion in 2013.

There are also fluxgates, proton precession magnetometers, superconducting quantum interferometers, and many other types. The magnetic sensor of the geared motor is mainly manufactured by using the principles of the magnetoelectric effect, magnetoresistance effect, magneto-optic effect, and thermomagnetic effect of some substances. In addition to Hall devices, semiconductor magnetoresistors, magnetodiodes, etc.

It has been widely used in aerospace, automobile, industry, consumption and many other fields. According to Shi Yunbo, magnetic sensors are an important part of sensor products. The automotive field accounts for more than 70% of the magnetic sensing application market. Geared motor vehicles are mainly used for speed, inclination, angle, distance, proximity, position and other parameters detection as well as navigation, positioning and other applications, such as speed measurement, pedal position, gearbox position, motor rotation, power torque measurement, crankshaft Position, inclination measurement, electronic navigation, anti-lock brake detection, parking positioning, etc.

The optical engine of the display unit of the geared motor is well-known in the industry for its ultra-high performance and stability, and the large-screen projection technology display wall entered the market in the early stage. It has won the favor of many partners and launched products with built-in Mitsubishi optics. After Mitsubishi Electric’s complete machine and system went on the market, it also won the victory.

The speed regulation principle of the single-phase speed-regulating motor: The driving rotor 1 of the clutch and the motor 5 are rigidly connected. The driving rotor (armature) is a steel cup-shaped cylinder, and the driven rotor (claw pole) is fixed on the driven shaft by claw-shaped magnetic poles 2 with an air gap between them. The middle part of the claw pole is wound with an excitation coil 4, which is powered by a DC power supply for excitation, and the two ends of the iron core are crossed in a claw shape to form an alternate N and S claw pole structure. The magnetic circuit is: N claw pole-air gap-armature-air gap-S claw pole-driven rotor iron grip-N claw pole. When the motor drives the active rotor to rotate, the armature cuts the magnetic field of the claw poles to generate eddy current, and the eddy current and the magnetic field of the claw poles generate torque, so that the driven rotor rotates in the same direction as the active rotor, and the speed is lower than that of the active rotor, that is, there is a slip . If the excitation current is large, the magnetic flux connecting the driving and driven rotors is strong, the slip is small, and the output speed of the clutch is high.

Advantages of single-phase speed-regulating motor: simple structure, reliable operation, and smooth speed regulation. Disadvantages: The electromagnetic torque is transmitted by the eddy current of the steel cylinder, the eddy current loss is large and the efficiency is low.