BAUMUELLER motor Germany BAUMUELLER model BAUMUELLER price

BAUMUELLER motors are devices that place 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. 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 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 applied to pairs of electromagnets, causing their magnetic pole properties to change cyclically, thus equivalent to a rotating magnetic field. Unlike DC motors, these motors do not have brushes or commutator 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.

BAUMUELLER 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 centrifugal force, the lubricating oil reaches the bearing lubrication zone more easily, resulting in better performance than conventional jet lubrication and oil-air lubrication, and further increasing 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 heat generation 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 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 shaft rotation accuracy. Preload methods mainly include constant position preload and constant force preload.

BAUMUELLER motor structure

The motor mainly consists of a stator, a rotor, and bearings. The stator is mainly composed of an iron core, a three-phase winding, a frame, and end shields. The stator core is generally made by punching and stacking silicon steel sheets with an insulating layer on the surface, with a thickness of 0.35~0.5 mm. Uniformly distributed slots are punched in the inner circle of the core to accommodate the stator winding. The three-phase winding is formed by connecting three windings with identical structures, arranged symmetrically and spaced 120° electrical degrees apart in space. The coils of these windings are inserted into the stator slots according to specific rules. Its function is to generate a rotating magnetic field when supplied with three-phase AC power. The frame is typically a cast iron component; for large asynchronous motors, the frame is generally welded from steel plates, while for miniature motors, the frame is made of cast aluminum. Its function is to fix the stator core and front and rear end shields to support the rotor, and to provide protection and heat dissipation. The frame of enclosed motors has cooling fins on the outside to increase the heat dissipation area. The end shields of protected motors have ventilation holes at both ends, allowing direct convection of air inside and outside the motor to facilitate heat dissipation. The end shields mainly serve to fix the rotor, provide support, and offer protection. The rotor is mainly composed of an iron core and a winding. The material used for the rotor core is the same as that of the stator, made by punching and stacking silicon steel sheets with a thickness of 0.5 mm. Uniformly distributed holes are punched in the outer circle of the silicon steel sheets to accommodate the rotor winding. Typically, the rotor core is punched from the inner circle of the silicon steel sheets remaining after punching the stator core. For small asynchronous motors, the rotor core is directly press-fitted onto the shaft. For large and medium-sized asynchronous motors (with a rotor diameter above 300~400 mm), the rotor core is pressed onto the shaft using a rotor spider. Rotor windings are divided into squirrel-cage rotors and wound rotors. (1) Squirrel-cage rotor: The rotor winding consists of multiple conductive bars inserted into the rotor slots and two ring-shaped end rings. If the rotor core is removed, the overall shape of the winding resembles a squirrel cage, hence the name cage winding. Small cage motors use cast aluminum rotor windings, while motors above 100KW use copper bars and copper end rings welded together. Squirrel-cage rotors are classified into impedance-type rotors, single-cage rotors, double-cage rotors, and deep-bar rotors, each with different characteristics such as starting torque. (2) Wound rotor: The wound rotor winding is similar to the stator winding, also being a symmetrical three-phase winding, generally connected in a star configuration. The three output terminals are connected to three slip rings on the shaft, which are then connected to the external circuit via brushes.

BAUMUELLER motor performance

The output torque of a motor decreases as speed increases, and drops sharply at higher speeds, so its maximum operating speed is generally 300～600RPM. AC servo motors provide constant torque output, meaning they can output rated torque within their rated speed (generally 2000RPM or 3000RPM), and provide constant power output above rated speed. Four, overload capabilities differ; stepper motors generally do not have overload capability. AC servo motors have strong overload capability. Five, operating performance differs; stepper motor control is open-loop, and excessive starting frequency or load can easily cause step loss or stalling, while excessive speed at stop can cause overshoot. Therefore, to ensure control accuracy, acceleration and deceleration must be handled properly. AC servo drive systems are closed-loop; the driver can directly sample feedback signals from the motor encoder, internally forming position and speed loops, generally avoiding step loss or overshoot phenomena common in stepper motors, making control performance more reliable. Six, speed response performance differs; it takes 200～400 milliseconds for a stepper motor to accelerate from standstill to operating speed (generally several hundred RPM). AC servo systems have better acceleration performance; for example, the Sanyo 400W AC servo motor accelerates from standstill to its rated speed 3000RPM in just a few milliseconds, suitable for control applications requiring rapid start-stop. In summary, AC servo systems outperform stepper motors in many performance aspects. However, stepper motors are often used as actuator motors in less demanding applications. Therefore, in the design of control systems, factors such as control requirements and cost must be comprehensively considered to select the appropriate control motor.

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