BEVI AB motor German BEVI AB model BEVI AB price

BEVI AB motors are a type of electric motor powered by simultaneously connecting to 380V three-phase AC current (phase difference 120 degrees). Because the rotor of a three-phase asynchronous motor rotates in the same direction but at a different speed than the stator's rotating magnetic field, there is slip, hence the name three-phase asynchronous motor. The rotor speed of a three-phase asynchronous motor is lower than the speed of the rotating magnetic field. The rotor windings generate electromotive force and current due to relative motion with the magnetic field, and interact with the magnetic field to produce electromagnetic torque, achieving energy conversion.

BEVI AB motor performance

Motor drive circuit, mainly considering the following performance indicators: 1, output current and voltage range. It determines the power of the motor that the circuit can drive; 2, efficiency. High efficiency not only means saving power, but also reduces the heat generation of the drive circuit. To improve circuit efficiency, start by ensuring the switching state of power devices and preventing shoot-through (a problem that may occur in H bridge circuits, where two power devices conduct simultaneously, causing a power supply short circuit); 3, impact on the control input terminal. The power circuit should have good signal isolation for its input terminal to prevent high voltage and large current from entering the main control circuit, which can be achieved using high input impedance or optocouplers; 4, impact on the power supply. Shoot-through can cause instantaneous drops in power supply voltage, resulting in high-frequency power pollution, and large currents may lead to ground potential fluctuation; 5, reliability. The motor drive circuit should be as safe as possible regardless of the control signal applied or the passive load. Input signal lines are introduced via Port, Port1 pin is the motor direction signal input terminal, Port2 pin is the PWM signal input terminal, Port3 pin is ground. Note that Port3 pin is connected to ground with a 2kΩ resistor. When the drive board and microcontroller are powered separately, this resistor provides a path for signal current return. When the drive board and microcontroller share a power supply, this resistor prevents large currents from flowing along the connection into the microcontroller motherboard ground, causing interference. In other words, it isolates the drive board ground from the microcontroller ground, achieving "single-point grounding". Capacitor C1 prevents sudden voltage drops caused by sudden motor startup. NAND gate U1A modulates the PWM signal with the motor direction signal, converting it into a square wave signal with an amplitude close to the power supply voltage.

BEVI AB motor performance

The design of the motor spindle shaft end is also an issue that cannot be ignored for high-speed electric spindles. The selection of electric spindle bearings and their preload technology. Bearings used in high-speed spindle units mainly include angular contact ball bearings, magnetic levitation bearings, water-based hydrostatic/hydrodynamic bearings, and air hydrostatic/hydrodynamic bearings. Due to their high cost, complex control systems, and difficult-to-solve heating issues, magnetic levitation bearings are not yet widely applied in high-speed spindle units. Water-based hydrostatic bearings are a popular research topic in China; they utilize the high heat capacity of water and the smaller bearing temperature rise to partially solve the serious heating problem of ordinary hydrodynamic/hydrostatic bearings, mainly used in low-speed, heavy-load applications. Air hydrostatic/hydrodynamic bearings have low radial stiffness and impact, but good high-speed performance, generally used in ultra-high-speed, light-load, precision spindles. Angular contact ball bearings with dn values are applied in the following high-speed spindle units, meeting requirements well in terms of speed limit, load capacity, stiffness, and precision, and are standardized with low prices. Angular contact ball bearings can also improve performance through the following methods.

BEVI AB motor mechanical characteristics

Motors serve as actuators in automatic control devices. For each pulse signal input, the stepper motor advances one step, hence it is also called a pulse motor. Stepper motors are mostly used in peripheral equipment of digital computers, as well as in printers, plotters, and disk drives. The drive power supply for stepper motors consists of a variable-frequency pulse signal source, a pulse distributor, and a pulse amplifier, thereby providing pulse current to the motor windings. The operating performance of a stepper motor depends on the good coordination between the motor and the drive power supply. The advantages of stepper motors are no cumulative error, simple structure, convenient use and maintenance, low manufacturing cost, and high ability to drive load inertia, making them suitable for small and medium-sized machine tools and applications with low speed and precision requirements. The disadvantages are lower efficiency, significant heat generation, and occasional "step loss".

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