Rexroth motor Germany Rexroth model Rexroth price

Rexroth motor is a type of motor that can be used in flammable and explosive environments, producing no electrical sparks during operation. Explosion-proof motors are mainly used in coal mines, oil and natural gas, petrochemical, and chemical industries. In addition, they are widely used in textiles, metallurgy, urban gas, transportation, grain and oil processing, papermaking, pharmaceuticals, and other sectors. As a primary power equipment, explosion-proof motors are typically used to drive pumps, fans, compressors, and other transmission machinery.

Rexroth 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 conflict between slot width and tooth width, transverse flux machine technology was developed, where the armature coils and slot structure are spatially perpendicular, and the main magnetic flux flows along the axial direction of the motor, thereby increasing the power density of the motor; a double-layer permanent magnet arrangement is adopted to increase the quadrature-axis conductance of the motor, thus increasing the output torque and maximum power of the motor; the stator tooth shape and pole shape are changed to reduce torque ripple of the motor, etc. Field-weakening speed expansion capability: After adopting field-weakening control, the operating characteristics of permanent magnet synchronous motors are better suited to the drive requirements of electric vehicles. Under the same power requirements, the inverter capacity is reduced, and the efficiency of the drive system is improved. Therefore, permanent magnet synchronous motors for electric vehicle drives generally adopt field-weakening speed expansion. For this purpose, research institutions at home and abroad have proposed various schemes, such as adopting a double 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 nonlinearity and multivariable nature of permanent magnet synchronous motors, control is difficult and control algorithms are complex; traditional vector control methods often fail to meet 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 rely on the mathematical model of the controlled object, offer good adaptability and robustness, and have unique advantages for highly nonlinear systems such as permanent magnet synchronous motors.

Rexroth motor structure

The electronic commutation circuit of a motor consists of two main parts: the power conversion circuit and the control circuit. It works in conjunction with position sensors to control the energization sequence and timing of each phase winding of the motor stator, performing a function similar to mechanical commutation. When the system is running, the power converter accepts control information from the control circuit and distributes the power from the system's working supply to each phase winding on the stator of the BLDCM according to a certain logical relationship, so that the motor produces continuous torque. The inverter converts DC current into AC current to supply the motor. Unlike general inverters, its output frequency is not adjusted independently but is controlled by the rotor position signal, making it a "self-controlled inverter." Because the BLDCM uses a self-controlled inverter, the frequency of the motor input current always remains synchronized with the motor speed, preventing oscillation and loss of synchronism between the motor and the inverter; this is also one of the significant advantages of the BLDCM. The energization sequence and timing of each winding of an electric vehicle motor mainly depend on signals from position sensors. However, the signals generated by the position sensor generally cannot be used directly to drive the power switching elements of the power converter; they often require logical processing and isolation by the control circuit before they can drive the switching elements of the power converter. The role of the driver box circuit is to process the rotor position signals detected by the position sensor and output them according to a certain logical code to trigger the power switching transistors.

Rexroth motor classification

Broad classification of motors: The variety of motors itself is very large. AC motors can be divided into low-speed and high-speed types. Low-speed ones can be called low-speed motors, AC low-speed motors; high-speed ones can be called high-speed motors, high-speed electric motors, AC high-speed motors. High-speed motors can also be referred to as motorized spindles, high-speed motorized spindles, etc. The motorized spindle is a new technology that has emerged in the field of CNC machine tools in recent years, integrating the machine tool spindle and the spindle motor into one unit. Together with linear motor technology and high-speed tooling technology, it will push high-speed machining into a new era. A motorized spindle is an assembly that includes the motorized spindle itself and its accessories: the motorized spindle, high-frequency variable frequency device, oil mist lubricator, cooling device, built-in encoder, and tool changing device. Motorized spindles usually adopt composite ceramic bearings, which are wear-resistant and heat-resistant, with a lifespan several times that of traditional bearings; sometimes electromagnetic suspension bearings or hydrostatic bearings are used, where the inner and outer rings do not contact, theoretically offering infinite life. The motorized spindle is a product of the integration of the electric motor and the spindle; the rotor of the motor is the rotating part of the spindle, so theoretically, the motorized spindle can be regarded as a high-speed electric motor. The key technology is dynamic balancing at high speeds. Lubrication of motorized spindles generally adopts timed and quantified oil-air lubrication; grease lubrication can also be used, but the corresponding speed must be discounted. So-called timed means injecting oil at certain time intervals. So-called quantified means precisely controlling the amount of lubricating oil each time through a device called a quantitative valve. Oil-air lubrication refers to lubricating oil being blown into the ceramic bearings carried by compressed air. Oil volume control is very important; too little fails to provide lubrication; too much causes heating due to oil resistance during high-speed bearing rotation. Cooling device: To dissipate heat from the high-speed running motorized spindle as quickly as possible, circulating coolant is usually passed through the outer wall of the motorized spindle, and the role of the cooling device is to maintain the temperature of the coolant. To achieve automatic tool changing and rigid tapping, the motorized spindle has a built-in pulse encoder to achieve accurate phase angle control and coordination with feed. For application in machining centers, the motorized spindle is equipped with an automatic tool changing device, including disc springs, tool pulling cylinders, etc.; the widely known BT and ISO tools have been proven unsuitable for high-speed machining. In this context, high-speed tools such as HSK and SKI have appeared. To achieve speeds of tens of thousands or even over one hundred thousand revolutions per minute for the motorized spindle, a high-frequency variable frequency device must be used to drive the built-in high-speed motor of the motorized spindle, and the output frequency of the inverter must reach thousands of Hertz.

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