BMF motor Germany BMF model BMF price

BMF motor refers to the engine that controls the operation of mechanical components in a servo system; it is an auxiliary motor indirect speed change device. Servo motors can control speed with very accurate position precision, converting voltage signals into torque and rotational speed to drive controlled objects. The rotor speed of the servo motor is controlled by the input signal and can respond quickly. In automatic control systems, it serves as an actuator, featuring small electromechanical time constants and high linearity, converting received electrical signals into angular displacement or angular velocity output on the motor shaft. Divided into two main categories: DC and AC servo motors. Their main characteristics are no self-rotation when the signal voltage is zero, and the rotational speed decreases uniformly as torque increases.

BMF motor classification

Motors are divided into three basic types: electromechanical, magnetoelectric, and linear. Electromechanical stepper motors consist of iron cores, coils, gear mechanisms, etc. When the solenoid coil is energized, it generates magnetic force, pushing the iron core plunger to move. Through the gear mechanism, the output shaft rotates by an angle, and an anti-rotation gear keeps the output shaft in the new working position. When the coil is energized again, the shaft rotates by another angle, performing step-by-step motion sequentially. Magnetoelectric stepper motors have a simple structure, high reliability, low cost, and wide application. They mainly include permanent magnet, variable reluctance, and hybrid types. The rotor has permanent magnet poles, generating alternating polarity magnetic fields in the air gap, and the stator consists of four-phase windings. When the A phase winding is energized, the rotor turns toward the magnetic field direction determined by that phase winding. When the A phase is de-energized and the B phase winding is energized and excited, a new magnetic field direction is generated. At this point, the rotor rotates by an angle to align with the new magnetic field direction. The sequence of excited phases determines the direction of rotor rotation. If the change in stator excitation is too fast, the rotor cannot keep up with the change in the stator magnetic field direction, resulting in step loss. Low starting and operating frequencies are a disadvantage of permanent magnet stepper motors. However, permanent magnet stepper motors consume less power and have higher efficiency. In the early 80s of the 20th century, disc-type permanent magnet stepper motors with disc-shaped rotors appeared, bringing the step angle and operating frequency to the level of variable reluctance stepper motors.

BMF motor protection device

Motor differential protection devices are mainly used in large high-voltage motors in power plants, chemical plants, and other locations. If a serious fault causes motor burnout, it will seriously affect normal production and cause huge economic losses, so comprehensive protection must be provided. Existing integrated motor protection devices mainly target small and medium-sized motors, providing protection functions such as instantaneous current cutoff, thermal overload inverse-time overcurrent, two-stage definite-time negative sequence, zero-sequence current, rotor stall, excessive start time, and frequent starting. However, for extra-large capacity motors above 2000KW, they cannot meet the requirements for protection sensitivity and speed during internal faults. Therefore, this device was developed to work with integrated protection devices to provide more reliable and sensitive protection measures for high-voltage motors. This device is designed as a three-phase longitudinal differential protection. Because the 3KV, 6KV, and 10KV grids where extra-large capacity motors above 2000KW are located may be grids with transformer neutral points grounded via high resistance, three-phase longitudinal differential protection can serve not only as the main protection against phase-to-phase short circuits in the motor stator windings and lead wires but also as the main protection against single-phase ground faults, acting to trip instantaneously.

BMF motor applications

Motors have advantages such as simple structure, ease of manufacturing, low cost, and reliable operation, but their power factor is relatively low (less than 0.5), and efficiency is also low. The power of reactive synchronous motors generally ranges from a fraction of a watt to hundreds of watts, commonly used in automatic control devices, physical instruments, movie projectors, electrostatic copiers, and other equipment. Reactive synchronous motors have a simple structure, low cost, and reliable operation, and are widely used in automatic and remote control devices, recording fax machines, and the clock industry. An AC motor whose ratio of operating speed to the connected power supply frequency is a constant value. During operation, the motor speed is always equal to the synchronous speed, hence the term synchronous motor. Synchronous motors are widely used in high-power production machinery that does not require speed adjustment, such as large air compressors, crushers, blowers, and motor-generator sets, with powers reaching several kilowatts or even tens of thousands of kilowatts. Compared to asynchronous motors of the same capacity, high-power synchronous motors have obvious advantages: high power factor, which can be operated at a leading power factor by adjusting the excitation current, helping to improve the grid's power factor; and smaller volume for high-power, low-speed synchronous motors. Synchronous motors can be divided into salient-pole and non-salient-pole types based on rotor structural characteristics, generally made as salient-pole types. Classified by the fixed position of magnetic poles, there are rotating armature types (with magnetic poles fixed on the stator, where the rotor nests three-phase AC windings connected to the external circuit via slip rings and brushes on the shaft) and rotating field types (with magnetic poles fixed on the rotor), generally made as rotating field types. The magnetic poles of synchronous motors are generally excited by DC current; those using permanent magnets are called permanent magnet synchronous motors. A synchronous motor operating in motor state without mechanical load, only providing or absorbing reactive power to the grid, is called a synchronous condenser or synchronous compensator, used to improve grid power factor and maintain grid voltage levels.

Weidou Intelligent Technology specializes in selling German BMF motors, BMF motors, BMF drives, BMF synchronous motors, BMF servo motors, BMF DC motors, BMF AC motors, BMF stepper motors, BMF synchronous motors, BMF asynchronous motors, BMF single-phase motors, BMF three-phase motors, BMF drive motors, BMF geared motors, BMF electric motors, BMF original imports from Germany. Welcome customers to inquire and order.