Cibra motor Germany Cibra model Cibra price

Cibra motor refers to an electromagnetic device that realizes the conversion or transmission of electrical energy based on the law of electromagnetic induction. It generally refers to all machines that can convert mechanical energy into electrical energy and electrical energy into mechanical energy. The motor housing protection rating is IP44, and the cooling method is IC0141 totally enclosed fan-cooled (TEFC). The ambient air temperature varies with the seasons but does not exceed 15℃ to 40℃. The altitude does not exceed 1000m. Refer to the nameplate for rated frequency, rated voltage, insulation class, and duty cycle. When the supply voltage varies within ±0.05 of the rated value (frequency is the rated value), the motor output power maintains the rated value.

Cibra motor working principle

The motor is a rotating motor powered by a single-phase AC power supply, and its stator winding is single-phase. When connected to single-phase AC power, it generates an alternating pulsating magnetic field in the air gap between the stator and rotor, so the single-phase asynchronous motor cannot self-start. In AC motors, when AC current passes through the stator winding, an armature magnetomotive force is established, which has a significant impact on motor energy conversion and operating performance. Therefore, when a single-phase AC winding is supplied with single-phase AC, it produces a pulsating magnetomotive force. This magnetomotive force can be decomposed into two rotating magnetomotive forces with equal amplitude and opposite rotational speeds, thereby establishing forward and reverse rotating magnetic fields in the air gap. These two rotating magnetic fields cut the rotor conductors, inducing electromotive force and induced current in the rotor conductors respectively. The interaction between this current and the magnetic field produces positive and negative electromagnetic torques. The forward electromagnetic torque attempts to rotate the rotor forward; the reverse electromagnetic torque attempts to rotate the rotor backward. The superposition of these two torques constitutes the resultant torque that drives the motor rotation. Regardless of whether it is the forward or reverse rotating magnetic field, their magnitude relationship with the slip ratio is the same as that of three-phase asynchronous motors. If the motor speed is n, then for the forward rotating magnetic field, the slip ratio is: s+=(n1-n)/n1=s; for the reverse rotating magnetic field, the slip ratio is: s-=(-n1-n)/-n1=s. From the T-s curve of the single-phase asynchronous motor, the main characteristics are: (1) n=0, s=1, T=T++ T- =0, indicating that the single-phase asynchronous motor has no starting torque; if no other measures are taken, the motor cannot start. (2) When s≠1, T≠0, T has no fixed direction; it depends on the positive or negative value of s. (3) Due to the existence of reverse torque, the resultant torque decreases, so the overload capacity of single-phase asynchronous motors is low. Working principle of capacitor split-phase starting: During startup, switch K closes, causing the phase difference between the two winding currents I1 and I2 to be approximately 90°, thereby generating a rotating magnetic field and starting the motor. After normal rotation begins, the centrifugal switch opens, disconnecting the starting winding. Working principle of shaded-pole single-phase motor: After current is applied to the stator, part of the magnetic flux passes through the short-circuit ring, inducing current within it. The current in the short-circuit ring opposes changes in magnetic flux, creating a phase difference between the flux in the shaded part and the unshaded part, thus forming a rotating magnetic field that causes the rotor to turn. In the T-s curve of the single-phase asynchronous motor, the motor rotation direction is clockwise. This is because the magnetic flux in the unshaded part leads the magnetic flux in the shaded part.

Cibra motor performance

Although the working principle of the motor is similar to that of a split-phase single-phase asynchronous motor, the former has a much larger rotor resistance than the latter. Therefore, compared to standard asynchronous motors, servo motors have three distinct characteristics: 1, large starting torque. Due to the high rotor resistance, there is a significant difference compared to the torque characteristic curve of ordinary asynchronous motors. It allows the critical slip ratio S0>1, which not only makes the torque characteristic (mechanical characteristic) closer to linear but also provides a larger starting torque. Therefore, as soon as there is a control voltage on the stator, the rotor rotates immediately, exhibiting fast starting and high sensitivity. 2, wide operating range. 3, no self-rotation phenomenon. For a normally operating servo motor, as soon as the control voltage is lost, the motor stops immediately. When the servo motor loses control voltage, it operates in a single-phase state. Due to the high rotor resistance, the two torque characteristics produced by the interaction of the two oppositely rotating magnetic fields in the stator with the rotor (T1－S1, T2－S2 curves) and the resultant torque characteristic (T－S curve). The output power of AC servo motors is generally 0.1-100W. When the power frequency is 50Hz, voltages include 36V, 110V, 220, 380V; when the power frequency is 400Hz, voltages include 20V, 26V, 36V, 115V, and others. AC servo motors run smoothly with low noise. However, the control characteristic is nonlinear, and due to high rotor resistance, losses are high and efficiency is low. Therefore, compared to DC servo motors of the same capacity, they are larger in volume and heavier in weight, making them suitable only for small-power control systems of 0.5-100W.

Cibra motor duty cycle

Motor power supply excitation method: Generators with this excitation method have a dedicated DC generator, known as a DC exciter. The exciter is generally coaxial with the generator. The generator's excitation winding obtains DC current from the exciter via slip rings mounted on the main shaft and fixed brushes. This excitation method offers advantages such as independent excitation current, reliable operation, and reduced auxiliary power consumption. It was the main excitation method for generators in past decades and has mature operational experience. The disadvantages are slow excitation regulation speed and heavy maintenance workload, so it is rarely used in units above 10MW. Excitation method without exciter: In this method, no dedicated exciter is installed. Instead, the excitation power is obtained from the generator itself, rectified, and then supplied to the generator's own excitation winding, known as self-excited static excitation. Self-excited static excitation can be divided into self-shunt excitation and self-compound excitation. Self-shunt excitation obtains excitation current through a rectifier transformer connected to the generator outlet, which is rectified and supplied to the generator excitation. This method has advantages such as simple structure, fewer devices, cost savings, and less maintenance. Self-compound excitation includes not only a rectifier transformer but also a high-power current transformer connected in series with the generator stator circuit. The function of this transformer is to provide a larger excitation current to the generator during a short circuit to compensate for the insufficient output of the rectifier transformer. This excitation method has two excitation power sources: a voltage source obtained through the rectifier transformer and a current source obtained through the series transformer. Excitation method powered by AC exciter: Some modern large-capacity generators use an AC exciter to provide excitation current. The AC exciter is also mounted on the generator main shaft. Its output AC current is rectified and supplied to the generator rotor for excitation. At this time, the generator's excitation method belongs to separate excitation. Since a static rectification device is used, it is also called separate static excitation. The AC pilot exciter provides the excitation current. The AC pilot exciter can be a permanent magnet measuring device machine or an AC generator with a self-excited constant voltage device. To improve the excitation regulation speed, the AC exciter typically uses a medium-frequency generator of 100——200HZ, while the AC pilot exciter uses a medium-frequency generator of 400——500HZ. The DC excitation winding and three-phase AC winding of this generator are both wound in the stator slots. The rotor has only teeth and slots without windings, resembling a gear. Therefore, it has no rotating contact parts such as brushes or slip rings, offering advantages such as reliable operation, simple structure, and convenient manufacturing process. The disadvantages are higher noise and larger harmonic components in the AC electromotive force.

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