FLENDER motor Germany FLENDER model FLENDER price

FLENDER motor is a discrete value control motor that converts electrical pulse excitation signals into corresponding angular or linear displacement. This motor moves one step for each input electrical pulse, so it is also called a pulse motor. It is a micro special motor that converts electrical pulse signals into angular displacement to control rotor rotation. It serves as an actuator in automatic control devices. For each input pulse signal, the stepper motor advances one step, hence it is also known as a pulse motor. Stepper motors are widely used in peripheral equipment of digital computers, as well as in printers, plotters, and disk drives. The drive power supply of a stepper motor consists of a variable frequency pulse signal source, a pulse distributor, and a pulse amplifier, which provide pulse current to the motor windings. The operating performance of a stepper motor depends on the good coordination between the motor and the drive power supply. The advantages of stepper motors include no cumulative error, simple structure, convenient use and maintenance, low manufacturing cost, and high ability to drive load inertia. They are suitable for small and medium-sized machine tools and applications with low speed and precision requirements. The disadvantages include lower efficiency, significant heat generation, and occasional "step loss".

FLENDER motor working principle

When symmetrical three-phase AC current is supplied to the three-phase stator windings of the motor, a rotating magnetic field is generated that rotates clockwise in the space between the stator and the inner circle of the rotor at synchronous speed n1. Since the rotating magnetic field rotates at n1 speed and the rotor conductors are initially stationary, the rotor conductors cut the stator's rotating magnetic field, generating an induced electromotive force (the direction of which is determined by the right-hand rule). As the ends of the rotor conductors are short-circuited by shorting rings, an induced current basically consistent with the direction of the induced electromotive force is generated in the rotor conductors under the action of the electromotive force. The current-carrying conductors of the rotor are subjected to electromagnetic force in the stator magnetic field (the direction of the force is determined by the left-hand rule). The electromagnetic force generates electromagnetic torque on the rotor shaft, driving the rotor to rotate in the direction of the rotating magnetic field. Through the above analysis, the working principle of the motor can be summarized as follows: When three-phase symmetrical AC current is supplied to the three-phase stator windings of the motor (with a phase difference of 120 electrical degrees), a rotating magnetic field is generated. This rotating magnetic field cuts the rotor windings, thereby generating induced current in the rotor windings (which form a closed circuit). The current-carrying rotor conductors generate electromagnetic force under the action of the stator's rotating magnetic field, thereby forming electromagnetic torque on the motor shaft, driving the motor to rotate, with the motor rotation direction being the same as that of the rotating magnetic field.

FLENDER 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 and heat generation, 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 such 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 rotational accuracy. Preload methods mainly include constant position preload and constant force preload.

FLENDER motor mechanical characteristics

High motor efficiency: After embedding permanent magnet materials in the rotor, the rotor and stator magnetic fields operate synchronously during normal operation. There is no induced current in the rotor windings, eliminating rotor resistance and hysteresis losses, thus improving motor efficiency. 2. High power factor: Since there is no induced current excitation in the PMSM rotor, the stator windings present a resistive load, and the motor's power factor is close to 1, reducing stator current and improving motor efficiency. Meanwhile, the improvement in power factor enhances the grid quality factor, reduces losses in transmission and distribution lines, allows for reduced transmission and distribution capacity, and saves on grid investment. 3. High starting torque: In equipment requiring high starting torque (such as oilfield pumping motors), smaller capacity permanent magnet motors can replace larger capacity Y series motors. If 37kW permanent magnet synchronous motors replace 45kW ～ 55kW Y series motors, the phenomenon of "over-sized motor for small load" is effectively resolved, saving on equipment investment costs and improving system operating efficiency. 4. Good power performance indicators: When Y series motors operate at 60% load, efficiency decreases by 15%, power factor decreases by 30%, and power performance indicators decrease by 40%; whereas the efficiency and power factor of PMSM decrease very slightly. When the motor is at only 20% load, its power performance indicators remain above 80% of full load. 5. Low temperature rise: There is no resistance loss in the rotor windings, and almost no reactive current in the stator windings, resulting in low motor temperature rise. 6. Small volume, light weight, and less material consumption: For the same capacity, the volume, weight, and material usage of permanent magnet synchronous motors can be reduced by approximately 30%. 7. Allows for large air gaps, facilitating the construction of new magnetic circuits. 8. Small armature reaction and strong overload resistance.

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