AGOSTI motor Germany AGOSTI model AGOSTI price

AGOSTI motors refer to motors with speeds exceeding 10000r/min. Due to their high speed, their volume is much smaller than that of ordinary motors of the same power. Connected directly to the prime mover, they eliminate traditional reduction gears. Reasons such as the low moment of inertia of high-speed motors result in advantages including high motor power density, effective material savings, high transmission efficiency, low noise, and fast dynamic response.

AGOSTI motor development history

Motor development history: By changing the positions of the stator and rotor of a permanent magnet DC motor, a permanent magnet brushless DC motor can be obtained. It should be noted that the term "DC" can cause misunderstanding, as it does not refer to a DC motor; in fact, it is powered by AC square waves, so it is also called a permanent magnet brushless square wave motor. Its greatest advantage is being brushless, eliminating many problems caused by brushes. Moreover, the interaction between square wave current and square wave magnetic field can generate greater torque. The full name given by Professor Shen Dawei of Foshan Lighting is "permanent magnet brushless square wave torque motor." Replacing the excitation winding of a traditional synchronous motor with permanent magnet materials eliminates the copper losses of traditional brushes, slip rings, and excitation windings. Due to the use of sinusoidal AC and a brushless structure, it is also called a permanent magnet brushless AC motor. Its advantages are high energy density and high efficiency, with a wider speed range in the constant power region, and it can meet the high-performance requirements of electric vehicles using vector control methods. Asynchronous motors are characterized by simple structure, durability, low cost, reliable operation, low torque ripple, low noise, no need for position sensors, and high speed limits. Asynchronous motor vector control speed regulation technology is relatively mature, giving asynchronous motor drive systems significant advantages, so they were applied earlier to electric vehicle drive systems and remain the mainstream product for electric vehicle drive systems (especially in the United States), but they are gradually being replaced by other new types of brushless permanent magnet traction motor drive systems. The biggest disadvantage is the complex drive circuit and high cost; compared to permanent magnet motors, asynchronous motors have lower efficiency and power density.

AGOSTI motor working principle

When three-phase current flows into the three-phase symmetric windings of the permanent magnet synchronous motor stator, the magnetomotive forces generated by the current synthesize a rotating magnetomotive force with a constant amplitude. Since its amplitude remains unchanged, the trajectory of this rotating magnetomotive force forms a circle, called a circular rotating magnetomotive force. Its magnitude is exactly 1.5 times the maximum amplitude of the single-phase magnetomotive force, F represents the circular rotating magnetomotive force, (T・m); Fφl is the maximum amplitude of the single-phase magnetomotive force, (T・m); k is the fundamental winding factor; p is the number of pole pairs of the motor; N is the number of series turns per coil; I is the RMS value of the current flowing through the coil. Since the speed of the permanent magnet synchronous motor is always the synchronous speed, the rotor main magnetic field and the rotating magnetic field generated by the stator circular rotating magnetomotive force remain relatively stationary. The interaction between the two fields forms a synthetic magnetic field in the air gap between the stator and rotor, which interacts with the rotor main magnetic field to produce an electromagnetic torque Te that drives or hinders motor rotation. Te is the electromagnetic torque, (N・m); is the power angle, rad; BR is the rotor main magnetic field, T; Bnet is the air gap synthetic magnetic field, T. Due to the different positional relationships between the air gap synthetic magnetic field and the rotor main magnetic field, the permanent magnet synchronous motor can operate in either motor mode or generator mode. The three operating states of the permanent magnet synchronous motor are shown in Figure 3. When the air gap synthetic magnetic field lags behind the rotor main magnetic field, the generated electromagnetic torque is opposite to the direction of rotor rotation, and the motor is in generating state; conversely, when the air gap synthetic magnetic field leads the rotor main magnetic field, the generated electromagnetic torque is in the same direction as the rotor rotation, and the motor is in motoring state. The angle between the rotor main magnetic field and the air gap synthetic magnetic field is called the power angle. The permanent magnet synchronous motor consists of two key components: a multi-pole permanent magnet rotor and a stator with appropriately designed windings. During operation, the rotating multi-pole permanent magnet rotor creates a time-varying magnetic flux in the air gap between the rotor and stator. This flux generates AC voltage at the terminals of the stator windings, forming the basis for power generation. The permanent magnet synchronous motor discussed here uses a ring-shaped permanent magnet mounted on a ferromagnetic core. Internal permanent magnet synchronous motors are not considered here. Because embedding magnets into a plated ferromagnetic core is very difficult, by using magnets of appropriate thickness (500μm) and high-performance magnetic materials in the rotor and stator cores, the air gap can be made very large (300~500μm) without significant performance loss. This allows the stator windings to occupy a certain space in the air gap, greatly simplifying the manufacturing of permanent magnet synchronous motors.

AGOSTI 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 heating and 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 these 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 shaft rotation accuracy. Preload methods mainly include constant position preload and constant force preload.

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