BARUFFALDI motor Germany BARUFFALDI model BARUFFALDI price

BARUFFALDI 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 is always constant in steady state 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.

BARUFFALDI motor structure

The motor body is similar to a permanent magnet synchronous motor (PMSM). The rotor uses permanent magnets, mostly rare-earth permanent magnet materials, but has no cage winding or other starting devices. The stator windings use AC windings, generally supporting multi-phase (three-phase, four-phase, or five-phase). The rotor consists of permanent magnet steel arranged with a certain number of pole pairs (2P=2,4,6...). The design requires obtaining a trapezoidal wave with a top width of 120° in the stator windings, so the windings often adopt full-pitch, concentrated, or near full-pitch, concentrated forms to retain other harmonics in the magnetic flux density. Brushed DC motors rely on mechanical commutators to convert DC current into approximately trapezoidal AC current supplied to the armature windings, while brushless DC motors rely on electronic commutators to input square wave currents sequentially into each phase of the stator armature windings according to a certain phase sequence. When a phase of the stator winding of a brushless DC motor is energized, the magnetic field generated by the current in that phase interacts with the magnetic field produced by the rotor permanent magnets to generate torque, driving the rotor to rotate. Position sensors convert the rotor magnet position into electrical signals to control electronic switch circuits, thereby conducting the stator windings in a certain order, so that the stator phase current commutes in the correct order as the rotor position changes. This allows the electronic magnetic field to change continuously with the rotation of the rotor, generating a rotating magnetic field synchronized with the rotor speed, and keeping the spatial angle between the stator magnetic field and the rotor magnetic field at approximately 90°, pushing the rotor to rotate with maximum torque. Since the conduction sequence of the electronic switch circuit is synchronized with the rotor angle, it performs the commutation function of a mechanical commutator, ensuring that the stator and rotor magnetic fields remain basically perpendicular during operation to improve efficiency. Therefore, in terms of basic structure, a brushless DC motor can be considered a "self-synchronous motor system" composed of electronic switch commutation current, a permanent magnet synchronous motor, and position sensors, which will not lose step during operation. The rotor structure of permanent magnet brushless motors (BLDCM) includes both traditional inner rotor structures and new structural forms such as disc-type structures, outer rotor structures, and linear structures.

BARUFFALDI motor hot topics

Motor torque characteristics: To improve the torque characteristics of motors, many scholars and research institutions have made bold attempts and innovations in the structural design of permanent magnet synchronous motors, achieving many new advances. To resolve the contradiction between slot width and tooth width, transverse flux machine (transverse flux machine) technology was developed, where the armature coils and slot-tooth structure are spatially perpendicular, and the main magnetic flux flows along the axial direction of the motor, increasing the power density of the motor; a double-layer permanent magnet arrangement is adopted to increase the quadrature-axis conductance of the motor, thereby increasing the output torque and maximum power of the motor; the stator tooth shape and pole shape are changed to reduce torque ripple, etc. Field-weakening speed expansion capability: After adopting field-weakening control, the operating characteristics of permanent magnet synchronous motors are more suitable for the drive requirements of electric vehicles. Under the same power requirement, the inverter capacity is reduced, and the efficiency of the drive system is improved. Therefore, permanent magnet synchronous motors for electric vehicle drives universally adopt field-weakening speed expansion. For this purpose, research institutions domestically and internationally have proposed various schemes, such as adopting a dual stator structure, using different windings at different speeds to maximize the utilization of the permanent magnet field; adopting a composite rotor structure, adding reluctance segments to the rotor to control the direct-axis and quadrature-axis reactance parameters of the motor, thereby increasing the motor's speed expansion capability; and using deep slots in the stator to increase direct-axis leakage reactance to expand the motor's speed range. Motor control theory: Due to the non-linear and multi-variable characteristics of permanent magnet synchronous motors, control is difficult and control algorithms are complex; traditional vector control methods often cannot meet the requirements. Therefore, some advanced control methods have been applied in permanent magnet synchronous motor speed control systems, including adaptive observers, model reference adaptive control, high-frequency signal injection, and intelligent control methods such as fuzzy control and genetic algorithms. These control methods do not depend on the mathematical model of the controlled object, have good adaptability and robustness, and have unique advantages for highly non-linear systems such as permanent magnet synchronous motors.

BARUFFALDI motor structure

Motor rotor position sensors are of three types: photoelectric, magnetosensitive, and electromagnetic. In brushless DC motors using photoelectric position sensors, photoelectric sensing devices are configured at specific positions on the stator assembly, the rotor is equipped with a light-blocking plate, and the light source is 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 emit pulse signals at a certain frequency. Magnetosensitive position sensors refer to semiconductor sensitive elements whose parameters change according to certain laws with the surrounding magnetic field; their basic principles are the Hall effect and the magnetoresistive effect. The main working principle of magnetosensitive elements is the magnetic effect of current, primarily the Hall effect. In brushless DC motors using magnetosensitive position sensors, magnetosensitive sensing devices (such as Hall elements, magnetosensitive diodes, magnetosensitive transistors, magnetoresistors, or specialized integrated circuits) are mounted on the stator assembly to detect changes in the magnetic field produced by the permanent magnets as the rotor rotates. In brushless DC motors using electromagnetic position sensors, electromagnetic sensor components are installed on the stator assembly; when the position of the permanent magnet rotor changes, the electromagnetic effect causes the electromagnetic sensor to produce a high-frequency modulated signal (whose amplitude varies with the rotor position). In recent years, sensorless brushless DC motors have appeared; these motors use the back electromotive force of the stator windings as the position signal of the rotor magnets. After this signal is detected, it is processed by digital circuits and sent to logic switch circuits to control the commutation of the brushless DC motor. Since it eliminates the need for position sensors, making the structure of the brushless motor more compact, its application is becoming increasingly widespread.

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