Ari-Armaturen motor Germany Ari-Armaturen model Ari-Armaturen price

Ari-Armaturen motor refers to a motor that, under standard environmental conditions, operates continuously at 100% rated load within the 10%~100% rated speed range, with temperature rise not exceeding the motor's specified permissible value. When the slip variation of an asynchronous motor is small, the speed is proportional to the frequency; thus, changing the power supply frequency changes the speed of the asynchronous motor. During variable frequency speed control, it is always desired to keep the main magnetic flux constant. If the main magnetic flux is greater than the flux during normal operation, the magnetic circuit becomes oversaturated, causing the excitation current to increase and the power factor to decrease; if the main magnetic flux is less than the flux during normal operation, the motor torque decreases.

Ari-Armaturen motor structure

The motor consists of two basic parts: a stationary stator and a rotating rotor. The rotor is installed inside the stator cavity and supported on two end covers by bearings. To ensure the rotor can rotate freely within the stator, there must be a gap between the stator and the rotor, known as the air gap. The air gap of an electric motor is a very important parameter; its size and symmetry significantly affect the motor's performance. Figure 2 shows the components of a three-phase squirrel-cage asynchronous motor. The stator consists of a three-phase stator winding, a stator core, and a frame. The three-phase stator winding is the electrical part of the asynchronous motor and plays a crucial role in its operation, serving as the key component for converting electrical energy into mechanical energy. The structure of the three-phase stator winding is symmetrical, generally having six output terminals U1, U2, V1, V2, W1, W2, located in the terminal box outside the frame. These are connected in star (Y) or delta (△) configuration as required. The stator core is part of the magnetic circuit of the asynchronous motor. Since the main magnetic field rotates relative to the stator at synchronous speed, high-permeability silicon steel sheets with a thickness of 0.5mm are laminated to form the core to reduce losses induced in the iron core. Both sides of the silicon steel sheets are coated with insulating varnish to reduce eddy current losses in the core. The frame, also known as the housing, primarily supports the stator core and withstands the reaction forces generated during the motor's loaded operation. Heat generated by internal losses during operation is also dissipated outward through the frame. Frames for medium and small motors are generally made of cast iron. For large motors, where casting is inconvenient due to size, steel plates are often welded to form the frame.

Ari-Armaturen motor structure

The motor mainly consists of the rotor, end covers, stator, and other components. The stator structure of a permanent magnet synchronous motor is very similar to that of a conventional induction motor. The main difference in the rotor structure compared to an asynchronous motor is the presence of high-quality permanent magnet poles on the rotor. Depending on the placement of the permanent magnets on the rotor, permanent magnet synchronous motors are typically classified into surface-mounted rotor structures and interior rotor structures. The placement method of the permanent magnets greatly affects motor performance. Surface-mounted rotor structure—permanent magnets are located on the outer surface of the rotor core. This rotor structure is simple but produces very little asynchronous torque, making it suitable only for applications with low starting requirements; it is rarely used. Interior rotor structure—permanent magnets are located within the core between the squirrel-cage bars and the shaft. This structure offers good starting performance, and the vast majority of permanent magnet synchronous motors adopt this design.

Ari-Armaturen motor mechanical characteristics

Mechanical characteristics of the motor: The torque of a single-phase series-wound motor varies with time, meaning the torque magnitude differs at every instant. This shows a clear difference from the smoothness of DC motor torque; the output torque is effectively an average value. When the motor's magnetic circuit is not saturated, since the magnetic flux is proportional to the excitation current, the torque is proportional to the square of the current. When the motor's magnetic circuit is saturated, changes in current have little effect on the magnetic flux, so the torque changes approximately in proportion to the current. High starting torque and resistance to stalling are valuable advantages of this type of motor, making it suitable for applications where starting is difficult. With constant applied voltage and an unsaturated magnetic circuit, as the load increases, the armature current increases accordingly, causing both the magnetic flux and the resistive voltage drop to increase. From the speed expression, it can be seen that the speed drops rapidly. Conversely, under no-load conditions, both current and magnetic flux are very small, resulting in very high no-load speed, which can easily damage the motor. For safety and motor protection, no-load operation should be avoided as much as possible. However, for series-wound motors used in power tools, since they generally carry a working head, the no-load speed will not be too high. Furthermore, the design often limits the no-load speed to approximately 1.7 times the rated speed. For very low-power series-wound motors, the no-load speed will not be extremely high due to their inherently high torque. As the load increases, the speed decreases, keeping the output power relatively stable and preventing motor overload due to increased load. This characteristic makes such motors widely used in applications with significant variations in load torque, offering a wide speed control range. Regarding speed variation with load changes: when the load increases, the current in the armature winding increases accordingly. Since the stator field winding is connected in series with the armature winding, the current in the stator field winding is the same as that in the armature winding and thus also increases, leading to an increase in magnetic flux. Because magnetic flux is inversely proportional to speed, the speed decreases. The increase in current also increases the resistive voltage drops in various parts, causing the electromotive force to decrease, which further contributes to the speed reduction. Therefore, compared to the mechanical characteristics of DC motors, those of single-phase series-wound motors are softer, making speed control more challenging.

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