framo motor Germany framo model framo price

framo motor is a commonly used AC motor. The synchronous motor is the heart of the power system; it is a component that integrates rotation and stationary parts, electromagnetic changes and mechanical motion, to realize the conversion between electrical energy and mechanical energy. Its dynamic performance is very complex, and its dynamic performance has a great impact on the dynamic performance of the entire power system. The characteristic is: during steady-state operation, there is an invariant relationship between the rotor speed and the grid frequency: n=ns=60f/p, where f is the grid frequency, p is the number of pole pairs of the motor, and ns is called the synchronous speed. If the grid frequency remains constant, the speed of the synchronous motor in steady state is always constant and independent of the load magnitude. Synchronous motors are divided into synchronous generators and synchronous motors. AC machines in modern power plants are mainly synchronous generators.

framo motor structure

The motor armature core is the main part of the main magnetic circuit and is also used to embed the armature winding. Generally, the armature core is made by stacking laminations punched from silicon steel sheets with a thickness of 0.5mm, to reduce eddy current loss and hysteresis loss generated in the armature core during motor operation. The stacked core is fixed on the shaft or rotor bracket. Armature slots are opened on the outer circle of the core, and the armature winding is embedded in the slots. The function of the armature winding is to generate electromagnetic torque and induced electromotive force; it is the key component for energy conversion in DC motors, hence called the armature. It is composed of many coils (hereinafter referred to as elements) connected according to certain rules. The coils are wound with high-strength enamel-covered wire or glass-fiber-covered flat copper wire. The coil sides of different coils are embedded in the armature slots in upper and lower layers, and proper insulation must be ensured between the coils and the core, as well as between the upper and lower layers of coil sides. To prevent centrifugal force from throwing the coil sides out of the slots, the slot openings are fixed with slot wedges. The end connections of the coils extending out of the slots are bound with thermosetting non-woven glass tape. In DC motors, the commutator paired with brushes can convert the external DC power supply into alternating current in the armature coils, keeping the direction of electromagnetic torque constant; in DC generators, the commutator paired with brushes can convert the alternating electromotive force induced in the armature coils into DC electromotive force drawn from the positive and negative brushes. The commutator is a cylinder composed of many commutator segments, insulated from each other by mica sheets. The shaft serves to support the rotation of the rotor and requires certain mechanical strength and rigidity; it is generally processed from round steel.

framo motor performance

Common lubrication methods for motor spindle bearings include grease lubrication, oil mist lubrication, oil-air lubrication, jet lubrication, and under-ring lubrication. Grease lubrication requires no equipment and is widely used for low-speed spindles. Oil mist lubrication atomizes lubricating oil (such as turbine oil) with compressed air to lubricate the bearings. This method is easy to implement and requires simple equipment; the oil mist provides both lubrication and cooling for the bearings. However, oil mist is difficult to recover and causes serious environmental pollution, so it is gradually being replaced by the newer oil-air lubrication method. Oil-air lubrication directly brings a small amount of lubricating oil, without atomization, to the bearing lubrication zone uniformly along the wall of a dedicated oil-air pipe using compressed air at regular intervals and quantities. The lubricating oil provides lubrication, while the compressed air drives the oil movement and cools the bearing. The oil and air remain separated, which facilitates oil recovery and avoids environmental pollution. When implementing oil-air lubrication, each bearing generally requires a separate oil-air nozzle, with strict requirements for the injection position; otherwise, the lubrication effect is difficult to guarantee. The effectiveness of oil-air lubrication is also affected by the compressed air flow rate and oil-air pressure. Generally, increasing the air flow improves cooling, while increasing the oil-air pressure not only improves cooling but also helps the lubricating oil reach the lubrication zone; therefore, increasing oil-air pressure helps increase the bearing speed. Experiments show that increasing the pressure compared to conventional pressure in oil-air lubrication can increase the bearing speed by 20%. Jet lubrication directly uses high-pressure lubricating oil to lubricate and cool the bearings, resulting in high power consumption and cost.

framo motor applications

Applications of motors in precision machining: To improve productivity and machining quality, ultra-high-speed and ultra-high-precision machining are key. Currently, the feed speed requirements for CNC machine tools have increased from 6～8m/min to greater than 50～60m/min, and acceleration requirements have reached 1～5g. This specification cannot be achieved by traditional feed drive systems with intermediate transmission and conversion links, necessitating the search for a new actuator. This has led to the emergence of the new generation of linear motor feed drive systems. Since the end of the 20th century, the four major international machine tool exhibitions worldwide have shown that the direct drive of linear motors is increasingly applied to CNC machine tools, machining centers, presses, etc., which is a trend. Linear motor drives feature high thrust, high speed, high precision, and smooth feed motion. The machine tool feed system adopts direct drive by linear synchronous motors. The biggest difference from the original rotary motor transmission method is the elimination of the mechanical intermediate transmission link between the motor and the worktable (slide), i.e., shortening the length of the machine tool feed transmission chain to zero. Hence, this transmission method is called "direct drive," also known as "zero transmission." Direct drive avoids disadvantages such as backlash, inertia, friction, and insufficient rigidity in screw transmission, bringing performance indicators and advantages unattainable by the original rotary motor drive method.

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