JBW motor Germany JBW model JBW price

JBW motors consist of the motor body and the driver, representing a typical mechatronic product. Brushless motors refer to motors without brushes and commutators (or slip rings), also known as commutator-less motors. As early as the nineteenth century, when motors were first invented, the practical motors produced were of the brushless type, namely AC squirrel-cage asynchronous motors, which were widely used. However, asynchronous motors have many insurmountable drawbacks, resulting in slow development of motor technology. Transistors emerged in the mid-twentieth century, giving rise to DC brushless motors that use transistor commutation circuits to replace brushes and commutators. This new type of brushless motor is called an electronically commutated DC motor, which overcomes the drawbacks of the first generation of brushless motors.

JBW motor control methods

Motor Direct Torque Control Technology: Direct Torque Control (Direct Self-Control, DSC) constructs models of flux linkage and electromagnetic torque on the stator stationary coordinate system, achieving control of electromagnetic torque and stator flux linkage by applying different voltage vectors. The direct torque control method has advantages such as simple algorithms and good torque response; therefore, it is widely used in applications requiring high transient torque response. Due to inherent disadvantages in control, the direct torque control method exhibits low control frequency and large torque ripple at low speeds. Therefore, reducing torque ripple at low speeds has become a research hotspot in direct torque control methods. Sun Xiaohui and others achieved good results by optimizing the action time of voltage vectors to reduce torque ripple at low speeds. D.casadei and others applied the direct torque control method to the control of AC induction motors based on discrete space vector modulation technology, reducing torque ripple.

JBW motor structure

The motor mainly consists of a stator, a rotor, and bearings. The stator is mainly composed of an iron core, three-phase windings, a frame, and end shields. The stator core is generally punched and stacked from 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 windings. The three-phase windings are formed by connecting three structurally identical windings arranged symmetrically with a spatial separation of 120° electrical angle. The coils of these windings are embedded in the stator slots according to specific rules. Their 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. Closed-type motors have cooling fins on the outside of the frame to increase the heat dissipation area. Protected-type motors have ventilation holes in the end shields at both ends of the frame, allowing direct convection of air inside and outside the motor to facilitate heat dissipation. The end shields mainly serve to fix the rotor, providing support and protection. The rotor is mainly composed of an iron core and windings. The material used for the rotor core is the same as that of the stator, punched and stacked from silicon steel sheets 0.5 mm thick. Uniformly distributed holes are punched in the outer circle of the silicon steel sheets to accommodate the rotor windings. Typically, the inner circle of the silicon steel sheets remaining after punching the stator core is used to punch the rotor 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 conductor 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 squirrel-cage rotors, double squirrel-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, and then connected to the external circuit via brushes.

JBW motor classification

Motor classification: I. Classification by motor structural dimensions: ① Large motors refer to motors with a frame center height greater than 630mm. ② Medium-sized motors refer to motors with a frame center height between 355 and 630mm. ③ Small motors refer to motors with a frame center height within 80-315mm. Two. Classification by motor speed: ① Constant speed motors include standard cage types, special cage types (deep-bar, double-cage, high starting torque types), and wound types. ② Adjustable speed motors are motors equipped with a commutator. ③ Variable speed motors include pole-changing motors, single-winding multi-speed motors, special cage motors, and slip motors. Three. Classification by mechanical characteristics: ① Standard cage asynchronous motors are suitable for applications with small capacity and small slip variation for constant speed operation, such as blowers, centrifugal pumps, and lathes, where low starting torque and constant load are required. ② Deep-bar cage types are suitable for medium capacity applications where the starting torque is slightly higher than that of standard cage asynchronous motors. ③ Double-cage asynchronous motors are suitable for medium and large cage rotor motors. They have a larger starting torque but a slightly smaller maximum torque. They are suitable for constant speed loads requiring high starting torque, such as conveyor belts, compressors, crushers, mixers, and reciprocating pumps. ④ Special double-cage asynchronous motors are made from high-impedance conductor materials. Characteristics include high starting torque, low maximum torque, and large slip, enabling speed regulation. They are suitable for equipment such as punch presses and cutting machines. ⑤ Wound rotor asynchronous motors are suitable for applications requiring high starting torque and low starting current, such as conveyor belts, compressors, and rolling mills. Four. Classification by motor protection type: ① Open-type motors have no special protection for rotating and live parts other than necessary supporting structures. ② Protected-type motors have necessary mechanical protection for internal rotating and live parts, but this does not significantly impede ventilation. Depending on the protection structure of the ventilation openings, there are three types: mesh-covered, drip-proof, and splash-proof. Drip-proof differs from splash-proof; drip-proof prevents vertically falling solids or liquids from entering the motor interior, while splash-proof prevents liquids or solids from entering the motor interior from any direction within an angle of 1000 from the vertical. ③ Enclosed-type motor housings prevent free exchange of air between the inside and outside of the housing, but do not require complete sealing. ④ Waterproof-type motor housings prevent water under certain pressure from entering the motor interior. ⑤ Watertight-type: When the motor is submerged in water, the housing structure prevents water from entering the motor interior. ⑥ Submersible motors can operate in water for extended periods under specified water pressure. ⑦ Explosion-proof motor housings prevent gas explosions inside the motor from transmitting to the outside and causing explosions of flammable gases outside the motor. Five. Classification by motor operating environment: Types include standard, humid-heat, dry-heat, marine, chemical, high-altitude, and outdoor types.

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