amixon motor Germany amixon model amixon price

amixon motors are machines used to convert mechanical energy and AC electrical energy into each other. Due to the tremendous development of AC power systems, AC motors have become the most commonly used motors. Compared with DC motors, AC motors have a simple structure, are easy to manufacture, are relatively robust, and can be easily made into high-speed, high-voltage, high-current, and large-capacity motors because they do not have commutators (see commutation of DC motors). The power coverage range of AC motors is very large, from a few watts to hundreds of thousands of kilowatts, or even millions of kilowatts. In the early 80s of the 20th century, the largest steam turbine generator had reached 150 ten thousand kilowatts.

amixon 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 adjusting the load speed. This speed control method is essentially a slip power consumption type. Its main disadvantages are that efficiency decreases as speed decreases, installation requires disconnecting the motor from the load, maintenance workload is heavy, components such as shaft seals and bearings need to be replaced after a period of time, the site is generally dirty, making the equipment appear low-grade, and it is an obsolete technology. Manufacturers who were interested in speed control technology in the early days either did so because there was no high-voltage speed control technology available at the time, or due to cost considerations, and thus had some applications for 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 old equipment is gradually being replaced by high-voltage frequency converters during retrofitting. The frequency converter is a low-voltage frequency converter, 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 frequency conversion technology was not yet mature. Due to the low voltage of low-voltage frequency converters, the current cannot rise indefinitely, which limits the capacity of such frequency converters. 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 load-carrying capability of the frequency converter during startup. There is significant harmonic distortion to the grid. If 12 pulse rectification is used, harmonics can be reduced, but it does not meet strict harmonic requirements; the output transformer amplifies the dv/dt generated by the frequency converter while stepping up the voltage, so filters must be added to make it suitable for ordinary motors, otherwise corona discharge and insulation damage will occur. Using special variable frequency motors can avoid this situation, but it is not as good as using high-low type frequency converters.

amixon motor performance

The construction of the motor stator is basically similar to that of a capacitor-split-phase single-phase asynchronous motor. Its stator is equipped with two windings positioned 90° apart. One is the excitation winding Rf, which is always connected to the AC voltage Uf; the other is the control winding L, connected to the control signal voltage Uc. Therefore, AC servo motors are also called two-phase servo motors. The rotor of an AC servo motor is usually made in a squirrel-cage style. However, to give the servo motor a wide speed regulation range, linear mechanical characteristics, no "self-rotation" phenomenon, and fast response performance, it must have two characteristics compared with ordinary motors: high rotor resistance and low moment of inertia. There are two common rotor structures: one is a squirrel-cage rotor made of high-resistivity conductive material with high-resistivity bars; to reduce the rotor's moment of inertia, the rotor is made slender. The other is a hollow cup-shaped rotor made of aluminum alloy. The cup wall is very thin, only 0.2-0.3mm. To reduce the magnetic reluctance of the magnetic circuit, a fixed inner stator is placed inside the hollow cup-shaped rotor. The hollow cup-shaped rotor has a very small moment of inertia, rapid response, and smooth operation, so it is widely used. When there is no control voltage, the AC servo motor has only a pulsating magnetic field produced by the excitation winding in the stator, and the rotor remains stationary. When there is a control voltage, a rotating magnetic field is produced in the stator, and the rotor rotates in the direction of the rotating magnetic field. With a constant load, the motor speed changes with the magnitude of the control voltage. When the phase of the control voltage is reversed, the servo motor will reverse.

amixon motor classification

The motor drive current is purely AC; brushless DC motors can be further divided into brushless speed motors and brushless torque motors. Generally, there are two types of drive currents for brushless motors: one is trapezoidal wave (usually "square wave"), and the other is sinusoidal wave. Sometimes the former is called a DC brushless motor, and the latter an AC servo motor, which is strictly speaking a type of AC servo motor. To reduce rotational inertia, brushless DC motors usually adopt a "slender" structure. Brushless DC motors are much smaller in weight and volume than brushed DC motors, with corresponding reductions in rotational inertia of about 40%—50%. Due to processing issues with permanent magnet materials, the general capacity of brushless DC motors is below 100kW. These motors have good linearity in mechanical and adjustment characteristics, wide speed regulation range, long life, convenient maintenance, low noise, and do not suffer from problems caused by brushes, making them highly promising for control systems. The stator windings of these motors are mostly configured in a three-phase symmetrical star connection, similar to three-phase asynchronous motors. Permanent magnets that have been magnetized are attached to the rotor, and position sensors are installed inside the motor to detect the polarity of the rotor. The driver consists of power electronic devices and integrated circuits, functioning as follows: it accepts start, stop, and brake signals to control the motor's starting, stopping, and braking; receives position sensor signals and forward/reverse rotation signals to control the on/off states of each power transistor in the inverter bridge, generating continuous torque; accepts speed commands and feedback signals to control and adjust the speed; provides protection and display functions, among others. Since brushless DC motors operate self-controlled, they do not require additional starting windings on the rotor like synchronous motors under heavy load startup with variable frequency drives, nor do they experience oscillation or loss of synchronization during sudden load changes. For medium and small-capacity brushless DC motors, high-energy-product rare earth Nd-Fe-B (Nd-Fe-B) materials are commonly used for the permanent magnets. Therefore, the volume of rare earth permanent magnet brushless motors is reduced by one frame size compared to three-phase asynchronous motors of the same capacity. Over the past thirty years, research into variable frequency speed control for asynchronous motors has ultimately focused on finding methods to control the torque of asynchronous motors. Rare earth permanent magnet brushless DC motors will undoubtedly show advantages in the field of speed control due to their wide speed regulation, compact size, high efficiency, and small steady-state speed error. Because brushless DC motors possess the characteristics of DC brushed motors while also being frequency-changing devices, they are also known as DC variable frequency, with the internationally common term being BLDC. The operational efficiency, low-speed torque, and speed precision of brushless DC motors surpass those of any controlled technology inverters, making them worthy of industry attention. This product has already produced over 55kW, and can be designed up to 400kW, addressing the needs for energy savings and high-performance driving in the industrial sector.

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