Foseco motor Germany Foseco model Foseco price

The Foseco motor is a device that places the rotor in a rotating magnetic field, where it obtains torque under the action of the field, causing the rotor to turn. The rotor is a rotatable conductor, typically squirrel-cage in shape. It was invented by electrical engineer Nikola Tesla in 1887. The rotor is a rotatable conductor, typically squirrel-cage in shape. The stator is the non-rotating part of the electric motor, with the main task of generating a rotating magnetic field. The rotating magnetic field is not achieved by mechanical means. Instead, alternating current is passed through pairs of electromagnets, causing their magnetic pole properties to change cyclically, thus equivalent to a rotating magnetic field. Unlike DC motors, this type of motor does not have brushes or slip rings. Depending on the type of AC power used, there are single-phase and three-phase motors; single-phase motors are used in applications such as washing machines and electric fans, while three-phase motors serve as power equipment in factories.

Foseco motor precautions

Protection of motor from oil and water, A: Servo motors can be used in locations subject to water or oil droplet exposure, but they are not fully waterproof or oil-proof. Therefore, servo motors should not be placed or used in environments submerged in water or oil. B: If the servo motor is connected to a gearbox, an oil seal should be used when operating the servo motor to prevent oil from the gearbox from entering the servo motor. C: Do not immerse servo motor cables in oil or water. Two, Servo motor cable → Stress relief. A: Ensure that the cable is not subjected to torque or vertical load due to external bending forces or its own weight, especially at the cable outlet or connection point. B: When the servo motor is moving, the cable (the one supplied with the motor) should be firmly fixed to a stationary part (relative to the motor), and an additional cable installed in a cable support should be used to extend it, so that bending stress is minimized. C: Make the bend radius of the cable as large as possible. Three, Permissible shaft end load for servo motors. A: Ensure that radial and axial loads applied to the servo motor shaft during installation and operation are kept within the specified values for each model. B: Exercise extreme caution when installing a rigid coupling, as excessive bending load may cause damage or wear to the shaft end and bearings. C: It is recommended to use flexible couplings to keep radial load below the permissible value; these are designed specifically for servo motors with high mechanical strength. D: For permissible shaft loads, refer to the "Permissible Shaft Load Table" (user manual). Four, Servo motor installation notes, A: When installing/removing coupling components to/from the servo motor shaft end, do not strike the shaft end directly with a hammer. (Striking the shaft end directly with a hammer will damage the encoder on the other end of the servo motor shaft.) B: Strive to align the shaft end to the optimal state (misalignment may cause vibration or bearing damage).

Foseco motor operating mode

Excitation method for motor power supply: Generators with this excitation method have a dedicated DC generator, known as a DC exciter. The exciter is generally coaxial with the generator, and the generator's excitation winding obtains DC current from the exciter via slip rings mounted on the main shaft and fixed brushes. This excitation method has advantages such as independent excitation current, reliable operation, and reduced auxiliary power consumption. It was the main excitation method for generators in past decades and benefits from mature operational experience. The disadvantages are slow excitation regulation speed and high maintenance workload, so it is rarely used in units above 10MW. Excitation method without an exciter: In this excitation method, no dedicated exciter is installed; instead, the excitation power is obtained from the generator itself, rectified, and then supplied to the generator's own excitation winding, known as self-excited static excitation. Self-excited static excitation can be divided into self-shunt excitation and self-compound excitation. The self-shunt excitation method obtains excitation current through a rectifier transformer connected to the generator output, which is then rectified and supplied to the generator excitation. This method has advantages such as simple structure, fewer devices, cost savings, and low maintenance workload. The self-compound excitation method, in addition to having a rectifier transformer, also includes a high-power current transformer connected in series in the generator stator circuit. The function of this transformer is to provide a larger excitation current to the generator during short circuits to compensate for the insufficient output of the rectifier transformer. This excitation method has two excitation power sources: a voltage source obtained through the rectifier transformer and a current source obtained through the series transformer. Excitation method powered by an AC exciter: Some modern large-capacity generators use an AC exciter to provide excitation current. The AC exciter is also mounted on the generator's main shaft; its output AC current is rectified and supplied to the generator rotor for excitation. At this time, the generator's excitation method belongs to separately excited excitation, and since it uses a static rectification device, it is also called separately excited static excitation. An AC pilot exciter provides the excitation current. The AC pilot exciter can be a permanent magnet measuring device or an AC generator with a self-excited constant voltage device. To improve excitation regulation speed, AC exciters typically use medium-frequency generators of 100–200HZ, while AC pilot exciters use medium-frequency generators of 400–500HZ. The DC excitation winding and three-phase AC winding of this generator are both wound in the stator slots, while the rotor has only teeth and slots without windings, resembling a gear. Therefore, it has no rotating contact parts such as brushes or slip rings, offering advantages such as reliable operation, simple structure, and convenient manufacturing processes. The disadvantages are higher noise and larger harmonic components in the AC electromotive force.

Foseco motor common issues

Why do motors generate shaft currents? The current in the loop of the motor shaft – bearing housing – base is called shaft current. Causes of shaft current: (1) Asymmetric magnetic field; (2) Harmonics in the supply current; (3) Poor manufacturing or installation, causing uneven air gap due to rotor eccentricity; (4) Gaps between the two semi-circles of a detachable stator core; (5) Improper selection of the number of segments in a fan-shaped stacked stator core. Hazards: Erosion of the motor bearing surface or balls, forming pinpoint micro-pores, deteriorating bearing performance, increasing friction loss and heat generation, ultimately leading to bearing burnout. Prevention: (1) Eliminate pulsating magnetic flux and power supply harmonics (e.g., install AC reactors on the inverter output side); (2) During motor design, insulate the bearing housing and base of sliding bearings, and insulate the outer ring and end cover of rolling bearings. Two, Why can't general motors be used in high-altitude areas? Altitude has adverse effects on motor temperature rise, motor corona (for high-voltage motors), and commutation in DC motors. Attention should be paid to the following three aspects: (1) At high altitudes, the motor temperature rise is greater, and the output power is lower. However, if the decrease in ambient temperature with altitude is sufficient to compensate for the effect of altitude on temperature rise, the motor's rated output power can remain unchanged; (2) Anti-corona measures must be taken when using high-voltage motors in high-altitude areas; (3) Altitude is unfavorable for DC motor commutation; attention should be paid to the selection of carbon brush materials. Three, Why is it not suitable for motors to run under light load? Light load operation of motors will cause: (1) Low motor power factor; (2) Low motor efficiency. This results in equipment waste and uneconomical operation. (1) Excessive load; (2) Phase loss; (3) Blocked air ducts; (4) Prolonged low-speed operation; (5) Excessive power supply harmonics. Four, Why shouldn't motors in cold environments be started arbitrarily? Prolonged exposure of motors to low-temperature environments will: (1) Cause motor insulation cracking; (2) Freeze bearing grease; (3) Pulverize solder at wire joints. Therefore, motors should be stored with heating in cold environments, and windings and bearings should be inspected before operation. Five, What are the causes of three-phase current imbalance in motors? (1) Three-phase voltage imbalance; (2) Poor welding or contact in a certain phase branch inside the motor; (3) Inter-turn short circuit in motor windings, or short circuit to ground or between phases; (4) Wiring errors.

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