ALLWEILER motor Germany ALLWEILER model ALLWEILER price

ALLWEILER 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 allowable value. When the slip of an asynchronous motor does not change significantly, 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 an increase in excitation current and a decrease in power factor; if the main magnetic flux is less than the flux during normal operation, the motor torque decreases.

ALLWEILER motor starting

The resistance and inductance of the motor armature circuit are small, and the rotating body has certain mechanical inertia. Therefore, when the motor is connected to the power supply, the armature speed and the corresponding back EMF are very small at the beginning of starting, resulting in a large starting current. It can reach up to 15 to 20 times the rated current. This current will disturb the power grid, cause mechanical shock to the unit, and produce sparks at the commutator. Therefore, direct switching starting is only suitable for motors with a power not greater than 4 kilowatts (starting current is 6 to 8 times the rated current). To limit the starting current, a specially designed variable resistor is often connected in series in the armature circuit; its principle wiring is shown in Figure 1. During the starting process, as the speed continues to rise, each section of the resistor is short-circuited step by step in time, keeping the starting current within a certain allowable value. This starting method is called series resistor starting. It is very simple, the equipment is lightweight, and it is widely used in various small and medium-sized DC motors. However, due to high energy consumption during the starting process, it is not suitable for motors that start frequently or for medium and large DC motors. But for certain special needs, such as urban trams which start frequently, series resistor starting is usually adopted to simplify equipment, reduce weight, and facilitate operation and maintenance. For DC motors with larger capacity, reduced voltage starting is usually adopted. That is, a separate adjustable DC power supply supplies power to the motor armature. Controlling the power supply voltage allows smooth motor starting and achieves speed regulation. This method requires more complex power supply equipment.

ALLWEILER motor working principle

The linear motor is evolved from the corresponding rotary motor, and its working principle is similar to that of ordinary rotary motors. The magnetic poles of a linear synchronous motor can be excited by DC excitation windings or by permanent magnets, with the permanent magnet type offering higher reliability and efficiency. When symmetrical three-phase sinusoidal AC current is applied to the three-phase stator windings, under the combined action of the generated air gap traveling wave magnetic field and the permanent magnet pole magnetic field, the air gap magnetic field produces electromagnetic thrust on the permanent magnet pole mover. If the primary is fixed, the magnetic poles move in a straight line in the direction of the traveling wave magnetic field under the action of this electromagnetic thrust, and the speed of the magnetic pole movement is the same as the speed of the traveling wave magnetic field. Compared with linear induction motors, linear synchronous motors have greater driving force, better control performance, and higher position accuracy. Therefore, the application of linear synchronous motors in drive systems for high-speed ground transportation and linear lifting devices is receiving more attention, and various types of linear synchronous motors are the main choice for linear drives.

ALLWEILER motor mechanical characteristics

Motor control issues. Permanent magnet synchronous motors do not require external energy to maintain their magnetic field, but this also makes it extremely difficult to adjust and control their magnetic field from the outside. However, with the development of power electronic devices such as MOSFET and IGBT and control technology, most permanent magnet synchronous motors in application do not require magnetic field control and only require armature control. In design, it is necessary to combine three new technologies: permanent magnet materials, power electronic devices, and microcomputer control, enabling permanent magnet synchronous motors to operate under new working conditions. In addition, since the permanent magnet synchronous motor itself is a system with certain nonlinearity, strong coupling, and time-varying characteristics, and its servo object also has strong uncertainty and nonlinearity, plus the system is easily subject to varying degrees of interference during operation, adopting advanced control strategies and advanced control system implementation methods (such as based on DSP control) to improve the overall intelligence and digitalization level of the system should be a major breakthrough in the current development of high-performance permanent magnet synchronous motor servo systems.

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