SITI motor Germany SITI model SITI price

SITI motor refers to a motor that can operate on both DC and AC power supplies. This type of motor is widely used in daily household appliances, manual devices, computing tools, and precision machinery. In addition, it is frequently used in medical equipment, communication technology, measurement technology, the film industry, and many other fields.

SITI motor applications

The motor requires only a single-phase power supply, so it is widely used in small equipment for production and daily life. However, due to its relatively poor economic performance indicators, it is only made in low power ratings. Single-phase resistance-start asynchronous motor. Power ranges from 60 to 370W. Its characteristic is that no external phase-splitting component is added; it starts using the resistance of the auxiliary winding itself, and a centrifugal switch cuts off the auxiliary winding at the end of starting. The structure is relatively simple. It has medium starting torque and overload capacity, making it suitable for small machine tools, blowers, and medical machinery. Single-phase capacitor-start asynchronous motor. Power ranges from 120 to 750W. It is a single-phase motor that starts by increasing the starting torque using an external capacitor. An external capacitor is connected in series with the auxiliary winding, and at the end of starting, the centrifugal switch disconnects both the auxiliary winding and the capacitor from the power supply. Like the BO2 type, it operates with only the main winding, while the auxiliary winding remains idle. Capacitor-start motors have high starting torque but medium overload capacity. They are suitable for air compressors, refrigerators, washing machines, grinding mills, threshers, and water pumps. Single-phase capacitor motor. This is a single-phase motor that uses one capacitor for both starting and running; the auxiliary winding operates together with the capacitor and the main winding. Therefore, no centrifugal switch is required. Through proper design, an ideal rotating magnetic field is formed during operation, resulting in good motor performance, high efficiency and power factor, and low noise. Its power range is 4 to 250W. Since one capacitor is used for both starting and running, and considering the pros and cons, because the starting time is very short, the capacitor value is selected to meet the needs of long-term operation as much as possible, so a cheaper, smaller-value capacitor is chosen. Therefore, this type of motor has lower starting torque and can only be used in machinery that starts under no-load or light-load conditions, such as electric fans, ventilation fans, and tape recorders. Dual-value capacitor motors have higher power, and the required capacitors are much more expensive. This type of motor has good starting and running performance. Suitable for household appliances and small machine tools.

SITI motor applications

The motor rotor has many small teeth evenly distributed, 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, 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 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. 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, 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 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 A-AB-B-BC – C-CA-A is often adopted, changing the original step from 1/3 te to 1/6 te. Even by combining two-phase currents differently, 1/3 te can be changed to 1/12 te and 1/24 te, which is the basic theoretical basis for microstepping drive. It is not difficult to deduce that 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. 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, where Br is the magnetic flux density and S is the magnetic conduction area. F is proportional to L*D*Br, where L is the effective length of the iron core and D is the rotor diameter. Br=N·I/R, where 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.

SITI motor applications

The motor rotor has many small teeth evenly distributed, 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, 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 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. 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, 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 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 A-AB-B-BC – C-CA-A is often adopted, changing the original step from 1/3 te to 1/6 te. Even by combining two-phase currents differently, 1/3 te can be changed to 1/12 te and 1/24 te, which is the basic theoretical basis for microstepping drive. It is not difficult to deduce that 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. 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, where Br is the magnetic flux density and S is the magnetic conduction area. F is proportional to L*D*Br, where L is the effective length of the iron core and D is the rotor diameter. Br=N·I/R, where 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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