stoeber motor Germany stoeber model stoeber price

stoeber motors refer to motors with speeds exceeding 10000r/min. Due to their high speed, their volume is far smaller than that of ordinary motors of equivalent power. Connected directly to the prime mover, they eliminate traditional reduction gears. Reasons such as the low moment of inertia of high-speed motors result in advantages including high power density, effective material savings, high transmission efficiency, low noise, and fast dynamic response.

stoeber motor maintenance

The motor should be kept clean at all times; no debris is allowed to enter the interior of the motor. The air inlet and outlet must remain unobstructed. Use instruments to monitor the power supply voltage, frequency, and the motor's load current. The power supply voltage and frequency must conform to the data on the motor nameplate. The motor load current must not exceed the specified value on the nameplate; otherwise, the cause must be identified and measures taken. Operation can only continue after the abnormal condition has been eliminated. Use necessary means to detect the temperature rise at various parts of the motor. For wound-rotor motors, regularly check the contact pressure, wear, and sparking between the brushes and the collector rings. When the motor is stopped, disconnect the switch in the stator circuit, then move the brush lifting mechanism to the start position and disconnect the short-circuiting device. Regular maintenance is performed after motor operation, generally divided into minor repairs and major overhauls. Minor repairs are general inspections without major disassembly of the motor starting equipment or the overall unit, typically conducted once every quarter. Major overhauls involve disassembling all transmission devices and all motor components, followed by comprehensive inspection and cleaning of the disassembled parts, typically conducted once a year.

stoeber motor maintenance

The motor should be kept clean at all times; no debris is allowed to enter the interior of the motor. The air inlet and outlet must remain unobstructed. Use instruments to monitor the power supply voltage, frequency, and the motor's load current. The power supply voltage and frequency must conform to the data on the motor nameplate. The motor load current must not exceed the specified value on the nameplate; otherwise, the cause must be identified and measures taken. Operation can only continue after the abnormal condition has been eliminated. Use necessary means to detect the temperature rise at various parts of the motor. For wound-rotor motors, regularly check the contact pressure, wear, and sparking between the brushes and the collector rings. When the motor is stopped, disconnect the switch in the stator circuit, then move the brush lifting mechanism to the start position and disconnect the short-circuiting device. Regular maintenance is performed after motor operation, generally divided into minor repairs and major overhauls. Minor repairs are general inspections without major disassembly of the motor starting equipment or the overall unit, typically conducted once every quarter. Major overhauls involve disassembling all transmission devices and all motor components, followed by comprehensive inspection and cleaning of the disassembled parts, typically conducted once a year.

stoeber motor applications

The motor rotor has many small teeth evenly distributed. The stator teeth have three excitation windings, whose geometric axes are sequentially offset from the rotor tooth axes. 0, 1/3, 2/3, (the distance between the axes of two adjacent rotor teeth is the tooth pitch, denoted by te), i.e., A aligns 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' aligns with tooth 5. Rotation: If phase A is energized while phases B and C are de-energized, 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 de-energized, tooth 2 should align with B. At this time, the rotor shifts 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 de-energized, tooth 3 should align with C. At this time, the rotor shifts further to the right by 1/3 te. Tooth 4 is offset from A by 1/3 te. If phase A is energized while phases B and C are de-energized, tooth 4 aligns with A, and the rotor shifts 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 one tooth pitch to the right. If energization continues in the sequence A, B, C, A..., the motor rotates to the right by 1/3 te per step (per pulse). If energization follows the sequence A, C, B, A..., the motor reverses. It can be seen that the motor's position and speed have a one-to-one correspondence with the number of conduction cycles (pulse count) and frequency. The direction is determined by the conduction sequence. However, considering torque, smoothness, noise, and angle reduction, the conduction state A-AB-B-BC – C-CA-A is often adopted. This changes the original step size from 1/3 te to 1/6 te. Furthermore, through different combinations of two-phase currents, 1/3 te can be changed to 1/12 te and 1/24 te. This is the basic theoretical basis for 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. By conducting electricity in a specific 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. Due to cost and other considerations, two-, three-, four-, and five-phase motors are most 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, and S is the magnetic conduction area. F is proportional to L * D * Br. L is the effective length of the iron core, and D is the rotor diameter. Br = N · I/R. N · I is the ampere-turns of the excitation winding (current multiplied by turns), and 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.

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