Reggiana Riduttori motor Germany Reggiana Riduttori model Reggiana Riduttori price

Reggiana Riduttori motors change speed by altering the number of magnetic pole pairs, voltage, current, frequency, etc., to achieve higher performance. Due to their excellent performance, adjustable-speed motors are widely used in steel, power stations, cables, chemicals, petroleum, cement, textiles, printing and dyeing, papermaking, machinery and other industrial sectors for stepless speed control of constant-torque or decreasing-torque loads. They are especially suitable for driving pumps and fans with large flow variations, achieving good energy-saving effects.

Reggiana Riduttori motor braking methods

A motor is an AC motor with brushes and a commutator. Some series-wound motors can be powered by either AC or DC, known as universal motors. They are named for their field windings connected in series with the armature windings. The structure of a single-phase series motor is very similar to that of a DC series motor. The main difference is that the stator core of a single-phase series motor must be laminated from silicon steel sheets, while DC poles can be either laminated or made as a solid structure. The principle of generating rotating torque in a single-phase AC series motor is similar to that of a DC series motor and can be explained using DC motor operating principles. In a single-phase series motor, the stator winding is connected in series with the armature winding. The direction of rotation depends on the direction of electromagnetic torque and current. Therefore, when operating on AC power, as the power alternates, the polarity of the stator magnetic field and the rotor current (or its generated magnetic field) change direction simultaneously. According to the left-hand rule, the direction of electromagnetic force remains unchanged, so the series motor maintains a constant direction of rotation. When powered in the forward direction, the electromagnetic torque is counterclockwise. If the positive and negative polarities of the power supply are swapped, both the excitation flux and armature current directions change simultaneously, but the electromagnetic torque direction remains counterclockwise. Thus, the motor's direction of rotation does not change; i.e., the electromagnetic torque and rotation direction of a single-phase AC series motor do not vary with changes in power supply polarity.

Reggiana Riduttori motor operating modes

Several methods for obtaining excitation current for motors: 1. Excitation via DC generator: This method uses a dedicated DC generator, known as a DC exciter. The exciter is generally coaxial with the generator. The generator's excitation winding receives DC current from the exciter via slip rings mounted on the main shaft and fixed brushes. This method offers 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. However, excitation regulation is slow, and maintenance workload is high, so it is rarely used in units above 10MW. 2. Excitation via AC exciter: Some modern large-capacity generators use an AC exciter to provide excitation current. The AC exciter is also mounted on the generator's main shaft. Its output AC current is rectified to supply the generator rotor excitation. This is classified as separate excitation. Since static rectifiers are used, it is also called separate static excitation. An AC pilot exciter provides the excitation current. The AC pilot exciter can be a permanent magnet machine or an AC generator with a self-excited constant voltage device. To improve 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. In these generators, both the DC excitation winding and the three-phase AC winding are wound in the stator slots. The rotor has only teeth and slots, no windings, resembling a gear. Thus, it has no rotating contact parts like brushes or slip rings, offering reliable operation, simple structure, and convenient manufacturing. Disadvantages include higher noise and larger harmonic components in the AC electromotive force. 3. Excitation without an exciter: No dedicated exciter is installed. Instead, excitation power is taken from the generator itself, rectified, and then supplied back to the generator for excitation, known as self-excited static excitation. Self-excited static excitation includes self-shunt excitation and self-compound excitation. Self-shunt excitation obtains excitation current via a rectifier transformer connected at the generator outlet, which is then rectified to supply the generator excitation. This method features simple structure, fewer devices, lower investment, and less maintenance. Self-compound excitation includes not only a rectifier transformer but also a high-power current transformer connected in series in the generator stator circuit. This transformer provides higher excitation current during short circuits to compensate for insufficient output from the rectifier transformer. This method has two excitation sources: a voltage source from the rectifier transformer and a current source from the series transformer.

Reggiana Riduttori motor fault troubleshooting

Motor measurement terminals. (1) First, identify the two ends (start and finish) of each of the three-phase windings. Set the multimeter to the resistance range for measurement. Coils belonging to the same phase are connected and show no resistance, while coils not belonging to the same phase are not conductive. Therefore, the multimeter can be used to determine which two wire ends belong to the same phase winding leads. (2) Identify the homologous terminals (polarity) of the lead wires from two of the windings. Set the analog multimeter to the DC current range with the smallest scale. Connect the two wire ends of any one phase winding to the multimeter probes. Then, briefly touch the two wire ends of another phase winding to the positive and negative terminals of a dry cell battery. At the instant the battery is connected to the coil, if the meter needle deflects toward the side greater than zero (i.e., clockwise), then the battery's positive terminal and the multimeter's black probe are connected to the homologous terminals; otherwise, they are opposite. Daily maintenance content for continuously operating three-phase asynchronous motors: visual inspection; check whether the fan is working properly; check for abnormal vibration; verify whether the coupling connection is reliable; ensure the base mounting is secure; check whether the bearings are working properly (by listening to the sound); check whether the temperature is normal (using an infrared thermometer); regularly inspect wire connections and switch contacts; check whether the operating current is normal (using a clamp-on ammeter); additionally, for wound-rotor motors, inspect the carbon brushes and slip rings.

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