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ZaMa GmbH 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.

ZaMa GmbH motor classification

Motors can be classified in the following two ways: AC motors are typically categorized by function into AC generators, AC motors, and synchronous condensers. Due to the reversibility of motor operation, the same machine can function as either a generator or a motor. Classifying motors strictly as generators or motors is not entirely precise; rather, some motors primarily operate as generators, while others primarily operate as motors. AC motors are categorized by type into synchronous motors and asynchronous motors. The rotor speed ns of a synchronous motor is identical to the speed of the rotating magnetic field, known as the synchronous speed. ns has a strict relationship with the frequency of the connected AC power (f) and the number of pole pairs of the motor (P). ns = 60f/P. With a power frequency of 50 Hz, the synchronous speed of a one-pole-pair three-phase AC motor is 3000 rpm, and the synchronous speed of a two-pole-pair three-phase AC motor is 1500 rpm, and so on. The rotor speed of an asynchronous motor is always lower or higher than the speed of its rotating magnetic field, hence the name "asynchronous." The difference between the asynchronous motor rotor speed and the rotating magnetic field speed (known as slip) is typically within 10%.

ZaMa GmbH motor classification

The motor has similar teeth and slots distributed according to a specific pattern on the inner and outer surfaces of the stator and rotor cores. It utilizes changes in the magnetic circuit reluctance caused by the relative positional change of the stator and rotor core teeth and slots to generate torque. The rotor core is made of silicon steel sheets or soft magnetic materials. When one phase of the stator is excited, the rotor turns to the position where the magnetic circuit reluctance is minimized. When another phase is excited, the rotor turns to another position where the magnetic circuit reluctance is minimized, and the motor stops rotating. At this point, the rotor has turned through a step angle θb, where N in the formula is the number of operating beats for the rotor to turn through one tooth pitch; ZR is the number of rotor teeth. Reluctance stepper motors have various structural forms. The stator core can be single-section or multi-section; the magnetic circuit can be radial or axial; and the winding phases can be three-phase, four-phase, or five-phase. The step angle of reluctance stepper motors can be achieved at 1° to 15°, or even smaller. Precision is easy to ensure, and starting and operating frequencies are high, but power consumption is relatively high and efficiency is low. Hybrid stepper motors. Their stator and rotor core structures are similar to those of reluctance stepper motors. The rotor has permanent magnets that generate a unipolar magnetic field in the air gap, which is also modulated by the teeth and slots of the soft magnetic material on the rotor. Hybrid stepper motors combine the advantages of both permanent magnet stepper motors and reluctance stepper motors, featuring small step angles, high precision, high operating frequency, low power consumption, and high efficiency.

ZaMa GmbH motor applications

A most typical application of the motor is traction for maglev trains. Its advantages of high speed, comfort, safety, pollution-free operation, noiselessness, vibration-free operation, and energy efficiency are increasingly favored. The primary part (stator assembly) is installed on the track, making the vehicle lighter, power supply more convenient, and technology simpler. Suspension coils generate electromagnetic attraction, pulling the vehicle upward toward the track from below and maintaining a certain vertical distance. The magnetic force generated by guidance coils maintains a certain lateral distance between the vehicle and the track. All of this is ensured by a set of high-precision electronic adjustment systems, keeping the vehicle consistently oriented and suspended at 10 to 15mm while moving in a straight line. Power for the suspension and guidance systems as well as onboard equipment is supplied by the suspension linear generator. In the case of superconducting suspension, the vehicle can be suspended to over 100mm. Application of motors in vertical lifting systems: As modern high-rise buildings become taller and underground mining goes deeper, the defects of traditional rope-based hoisting systems become increasingly apparent, and the mechanical strength of hoisting steel ropes has a limited range. The hoisting system using permanent magnet linear synchronous motors is a ropeless hoisting system, featuring characteristics such as unlimited lifting height (depth) by equipment, fewer equipment items, less space occupation, simplified hoisting system, improved system efficiency, reduced construction costs, and energy savings. Compared to rope hoisting systems, linear motor hoisting systems have the additional major advantage of achieving high-speed lifting unattainable by the latter, shortening the lifting cycle and improving work efficiency.

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