JVM Antriebe motor Germany JVM Antriebe model JVM Antriebe price

JVM Antriebe motors are equipped with a set of adjustable eccentric blocks at each end of the rotor shaft, utilizing the centrifugal force generated by the high-speed rotation of the shaft and eccentric blocks to obtain excitation force. Vibration motors have a wide vibration frequency range; only when the excitation force and power are properly matched can mechanical noise be reduced. Vibration motors have six classifications, such as by starting and operating mode, and by operating speed.

JVM Antriebe motor application

The motor rotor is evenly distributed with many small teeth, and the stator teeth have three excitation windings, whose geometric axes are sequentially offset from the rotor tooth axes. 0, 1/3 te, 2/3 te, (the distance between the axes of two adjacent rotor teeth is the tooth pitch, expressed as te), i.e., A is aligned with tooth 1, B is offset to the right from tooth 2 by 1/3 te, C is offset to the right from tooth 3 by 2/3 te, A' is aligned with tooth 5. Rotation: If phase A is energized while phases B and C are not, due to the magnetic field effect, tooth 1 aligns with A (the rotor is not subjected to any force; the same applies below). If phase B is energized while phases A and C are not, tooth 2 should align with B; at this time, the rotor moves to the right by 1/3 te, tooth 3 is offset from C by 1/3 te, and tooth 4 is offset from A by (te - 1/3 te) = 2/3 te. If phase C is energized while phases A and B are not, tooth 3 should align with C; at this time, the rotor moves further to the right by 1/3 te, and tooth 4 is offset from A by 1/3 te alignment. If phase A is energized while phases B and C are not, tooth 4 aligns with A, and the rotor moves further to the right by 1/3 te. Thus, after the energization states of A, B, C, and A respectively, tooth 4 (i.e., the tooth preceding tooth 1) moves to phase A, and the motor rotor rotates to the right by one tooth pitch. If A, B, C, A... are continuously energized, the motor rotates to the right by 1/3 te per step (per pulse). If A, C, B, A... are energized, the motor reverses. It can be seen that the position and speed of the motor have a one-to-one correspondence with the number of conduction times (pulse count) and frequency. The direction is determined by the conduction sequence. However, considering torque, smoothness, noise, and angle reduction, the conduction state of A-AB-B-BC - C-CA-A is often adopted, changing the original step from 1/3 te to 1/6 te. Even through different combinations of two-phase currents, 1/3 te can be changed to 1/12 te, 1/24 te, which is the basic theoretical basis for motor microstepping drive. It is not difficult to deduce: The motor stator has m phase excitation windings, whose axes are offset from the rotor tooth axes by 1/m, 2/m... (m-1)/m, 1. And if conduction follows a certain phase sequence, the motor can be controlled to rotate forward or reverse—this is the physical condition for rotation. As long as this condition is met, we can theoretically manufacture stepper motors with any number of phases. Considering cost and other factors, two-, three-, four-, and five-phase motors are common in the market. Torque: Once the motor is energized, a magnetic field (magnetic flux Ф) is generated between the stator and rotor. When the rotor and stator are offset by a certain angle, a force F is produced, proportional to (dФ/dθ) S. Its magnetic flux Ф = Br * S. Br is the magnetic flux density, S is the magnetic conduction area. F is proportional to L * D * Br. L is the effective length of the iron core, D is the rotor diameter. Br = N · I/R. N · I is the ampere-turns of the excitation winding (current multiplied by turns), R is the magnetic reluctance. Torque = Force * Radius. Torque is proportional to the motor's effective volume * ampere-turns * magnetic flux density (considering only the linear state). Therefore, the larger the motor's effective volume, the greater the excitation ampere-turns, and the smaller the air gap between stator and rotor, the greater the motor torque, and vice versa.

JVM Antriebe motor structure

The motor structure is basically the same as that of a DC motor, with different armature structures and excitation methods. In practice, slotted iron core armature structures are often used, where conductors placed in armature slots are subjected to smaller electromagnetic forces, making it easier to meet the mechanical strength requirements of insulation materials during high-speed operation. Although excitation methods can be made as series-excited and shunt-excited, the torque of shunt-excited motors is much lower than that of series-excited ones. Therefore, series-excited DC motors with slotted armatures are usually manufactured. The stator of AC/DC universal motors is equipped with main magnetic poles embedded with series-excited windings, and the rotor is similar to the slotted armature of a DC motor, with magnetic circuits composed of laminated iron cores. Stator laminations facilitate manufacturing and reduce costs. Armature iron cores generally adopt a skewed slot form. The air gap between stator and rotor is larger than that of DC motors and is uneven, with the maximum air gap at the sharpest point being 3 to 4 times the main air gap. Other components such as brush holders and end caps are similar to those of ordinary DC motors. AC/DC universal motors have different structural forms and are sometimes made in split assemblies, with split assembly structures similar to torque motor structures. For high-capacity, high-speed, or special requirement AC/DC universal motors, commutating poles are also required to improve commutation, suppress sparks, and reduce radio interference.

JVM Antriebe motor structure

The motor is mainly composed of stator, rotor, end caps, and other components. The stator is made of laminated stacks to reduce iron losses during motor operation, and contains three-phase AC windings, called the armature. The rotor can be made in solid form or from laminated stacks, with permanent magnet materials mounted on it. Depending on the position of the permanent magnet material on the motor rotor, permanent magnet synchronous motors can be divided into two structural forms: surface-mounted and interior-mounted. Figure 1 shows the corresponding schematic diagrams. The surface-mounted rotor has a simple magnetic circuit structure and low manufacturing cost, but since start windings cannot be installed on its surface, asynchronous starting cannot be achieved. The magnetic circuit structures of interior-mounted rotors mainly include radial, tangential, and hybrid types, totaling 3 kinds. The main difference between them lies in the relationship between the magnetization direction of the permanent magnets and the rotor rotation direction. Figure 2 shows the magnetic circuit structures of 3 different forms of interior-mounted rotors. Since the permanent magnets are placed inside the rotor, the rotor surface can be made with pole shoes, and inserting copper bars or cast aluminum into the pole shoes can serve starting and damping functions, resulting in good steady-state and dynamic performance. Also, due to the asymmetry of the interior-mounted rotor magnetic circuit, reluctance torque is generated during operation, which helps improve the motor's power density and overload capacity, and such a structure is easier to achieve field weakening for speed expansion.

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