AEG motor Germany AEG model AEG price

AEG motor is a single-phase AC commutator motor, suitable for single-phase power supply applications requiring speed regulation and reversal of rotation direction. The stator winding is powered by a single-phase source, and the rotor is an armature winding with a commutator short-circuited via brushes. The brushes can be moved to any position relative to the stator winding as needed. By shifting this position, the rotor's direction of rotation, mechanical characteristics, and operating speed can be changed. When the brushes deviate counterclockwise from the geometric neutral axis, the rotor rotates clockwise; when the brushes deviate clockwise from the geometric neutral axis, the rotor rotates counterclockwise.

AEG motor maintenance

The motor should be kept clean at all times, and no foreign matter 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 comply with the data on the motor nameplate, and 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. Take necessary measures to detect the temperature rise of various parts of the motor. For wound-rotor motors, pay close attention to 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 starting 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 maintenance tasks that do not involve significant disassembly of the motor starting equipment or the overall unit, typically conducted once every quarter. Major overhauls involve disassembling all transmission devices and all components of the motor, followed by comprehensive inspection and cleaning of the disassembled parts, typically conducted once a year.

AEG motor speed control

An impeller is added between the motor shaft and the load shaft, and the pressure of the liquid (usually oil) between the impellers is adjusted to achieve the purpose of regulating the load speed. This speed control method is essentially a slip power consumption approach. Its main disadvantages are decreasing efficiency as speed drops, the need to disconnect the motor from the load for installation, high maintenance workload, and the need to replace components such as shaft seals and bearings after a certain period. The site is generally dirty, making the equipment appear low-grade, and it is considered an obsolete technology. Manufacturers who were initially interested in speed control technology either had no high-voltage speed control options available at the time or considered cost factors, leading to some applications of hydraulic couplings. Examples include water pumps in water supply companies, boiler feed pumps and induced draft fans in power plants, and dust removal fans in steel mills. Today, some older equipment is gradually being replaced by high-voltage variable frequency drives during retrofits. The inverter is a low-voltage variable frequency drive, using an input step-down transformer and an output step-up transformer to interface with the high-voltage grid and the motor. This was a transitional technology when high-voltage variable frequency technology was not yet mature. Due to the low voltage of the low-voltage inverter, the current cannot increase indefinitely, which limits the capacity of this type of inverter. The presence of the output transformer reduces system efficiency and increases the footprint. Additionally, the magnetic coupling capability of the output transformer weakens at low frequencies, reducing the inverter's load-carrying capacity during startup. There is significant harmonic distortion to the grid. If 12 pulse rectification is used, harmonics can be reduced, but strict harmonic requirements cannot be met. The output transformer amplifies the dv/dt generated by the inverter to the same extent, so filters must be installed to make it suitable for standard motors; otherwise, corona discharge and insulation damage may occur. Using special variable frequency motors can avoid this situation, but it is not as advantageous as using high-low type inverters.

AEG motor speed control

Motor pole-changing speed control: This method changes the number of pole pairs in the stator of a squirrel-cage motor by altering the wiring configuration of the stator winding to achieve speed control. Variable frequency speed control changes the frequency of the stator power supply to the motor, thereby changing its synchronous speed. The main equipment in a variable frequency speed control system is the inverter, which provides the variable frequency power. Inverters can be divided into two categories: AC-DC-AC inverters and AC-AC inverters. In China, AC-DC-AC inverters are mostly used. Cascade speed control involves inserting an adjustable additional electromotive force into the rotor circuit of a wound-rotor motor to change the motor's slip, achieving speed control. Most of the slip power is absorbed by the inserted additional electromotive force, and then a generating additional device is used to return the absorbed slip power to the grid or convert the energy for utilization. Based on the method of absorbing and utilizing slip power, cascade speed control can be divided into motor cascade speed control, mechanical cascade speed control, and thyristor cascade speed control, with thyristor cascade speed control being the most commonly used. Inserting additional resistance into the rotor of a wound-rotor asynchronous motor increases the motor's slip rate, causing the motor to operate at a lower speed. The greater the inserted resistance, the lower the motor speed. This method features simple equipment and convenient control, but the slip power is consumed as heat in the resistor. It belongs to stepped speed control, and the mechanical characteristics are relatively soft. When the stator voltage of the motor is changed, a set of different mechanical characteristic curves can be obtained, thereby achieving different speeds. Since the motor torque is proportional to the square of the voltage, the maximum torque decreases significantly, resulting in a narrow speed control range, which makes it difficult to apply to general squirrel-cage motors. To expand the speed control range, voltage-regulating speed control should use squirrel-cage motors with high rotor resistance, such as torque motors specifically designed for voltage-regulating speed control, or connect frequency-sensitive resistors in series with wound-rotor motors. To expand the stable operating range, feedback control should be adopted to achieve automatic speed regulation when speed control is above 2:1. The main device for voltage-regulating speed control is a power supply capable of providing voltage variation. Common voltage regulation methods include series saturable reactors, autotransformers, and thyristor voltage regulation, with thyristor voltage regulation being the optimal method.

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