Sampo motor Germany Sampo model Sampo price

Sampo motors refer to electric motors with a rated voltage above 1000V. Commonly used voltages are 6000V and 10000V. Due to differences in foreign power grids, there are also voltage levels of 3300V and 6600V. High-voltage motors were developed because motor power is proportional to the product of voltage and current. Therefore, when the power of low-voltage motors increases to a certain extent (such as 300KW/380V), the current is limited by the allowable carrying capacity of the wires, making it difficult to increase further or resulting in excessive costs. High voltage is required to achieve high-power output. The advantages of high-voltage motors are high power and strong shock resistance; the disadvantages are high inertia, making starting and braking difficult.

Sampo motor service life

Motor life is related to various factors such as functional failures caused by insulation deterioration, wear of sliding parts, and bearing degradation. In most cases, it depends on the bearing condition. Bearing life includes mechanical life and lubricant life. Bearing life: 1, lubricant life due to thermal degradation of lubricating oil; 2, mechanical life due to operational fatigue. In most cases, the effect of heat on lubricant life is greater than the effect of load weight on the mechanical life of the bearing. Therefore, motor life is estimated based on lubricant life. The most significant factor affecting lubricant life is temperature, which significantly impacts service life.

Sampo motor applications

The motor rotor has many small teeth evenly distributed. The stator teeth have three excitation windings, and their 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 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: When phase A is energized and phases B and C are not, due to the magnetic field, tooth 1 aligns with A (the rotor is not subjected to any force, same as below). When phase B is energized and 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. When phase C is energized and phases A and B are not, tooth 3 should align with C. At this time, the rotor moves to the right again by 1/3 te. Tooth 4 is offset from A by 1/3 te and aligns. When phase A is energized and phases B and C are not, tooth 4 aligns with A, and the rotor moves to the right again by 1/3 te. After the energization states of A, B, C, and A respectively, tooth 4 (i.e., the tooth before 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. Thus, 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. This changes the original step from 1/3 te to 1/6 te. Even through different combinations of two-phase currents, 1/3 te becomes 1/12 te, 1/24 te. This is the basic theoretical basis for microstepping drive. It can be deduced 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 and 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 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 magnetic reluctance. Torque = Force * Radius. Torque is proportional to motor effective volume * ampere-turns * magnetic flux density (considering only linear state). Therefore, the larger the motor effective volume, the larger the excitation ampere-turns, and the smaller the air gap between stator and rotor, the greater the motor torque, and vice versa.

Sampo motor working principle

Inside the motor, ring-shaped permanent magnets are fixed. Current passing through the coils on the rotor generates Ampere force. When the coils on the rotor are parallel to the magnetic field, the direction of the magnetic field received during continued rotation will change. Therefore, the brushes at the end of the rotor alternately contact the commutator segments, changing the direction of the current in the coils. The direction of the generated Lorentz force remains unchanged, so the motor can maintain rotation in one direction. The working principle of a DC generator is to convert the alternating electromotive force induced in the armature coil into direct current electromotive force at the brush terminals through the commutation action of the commutator and brushes. The direction of the induced electromotive force is determined by the right-hand rule (magnetic field lines point into the palm, the thumb points in the direction of conductor motion, and the other four fingers point in the direction of the induced electromotive force in the conductor). The direction of the force on the conductor is determined by the left-hand rule. This pair of electromagnetic forces forms a torque acting on the armature, called electromagnetic torque in rotating motors. The direction of the torque is counter-clockwise, attempting to rotate the armature counter-clockwise. If this electromagnetic torque can overcome the resisting torque on the armature (such as resisting torque caused by friction and other load torques), the armature can rotate counter-clockwise.

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