KATT motor Germany KATT model KATT price

KATT motors are permanent magnet motors commutated or controlled by electronic circuits. Permanent magnet brushless motors come in two types: sine wave drive and square wave drive. Those with rectangular wave drive current are commonly referred to as permanent magnet brushless DC motors, while those with sine wave drive current are commonly referred to as permanent magnet AC servo motors. Based on sensor type, they can be classified into sensor-equipped motors and sensorless motors.

KATT motor structure

Motor rotor position sensors fall into three categories: photoelectric, magnetosensitive, and electromagnetic. For brushless DC motors using photoelectric position sensors, photoelectric sensing devices are installed at specific positions on the stator assembly, and the rotor is equipped with a light-blocking plate. The light source is an LED or a small bulb. As the rotor rotates, the light-blocking plate causes the photosensitive components on the stator to intermittently emit pulse signals at a certain frequency. Magnetosensitive position sensors refer to semiconductor sensitive elements whose electrical properties change according to specific rules with the surrounding magnetic field; their basic principles are the Hall effect and the magnetoresistive effect. The main working principle of magnetosensitive elements is the magnetic effect of electric current, primarily the Hall effect. In brushless DC motors using magnetosensitive position sensors, magnetosensitive sensing devices (such as Hall elements, magnetosensitive diodes, magnetosensitive transistors, magnetoresistors, or specialized integrated circuits) are mounted on the stator assembly to detect changes in the magnetic field generated by the permanent magnets as the rotor rotates. In brushless DC motors using electromagnetic position sensors, electromagnetic sensor components are installed on the stator assembly. When the position of the permanent magnet rotor changes, the electromagnetic effect causes the electromagnetic sensor to generate high-frequency modulated signals (whose amplitude varies with the rotor position). In recent years, sensorless brushless DC motors have also emerged. These motors use the back electromotive force (EMF) of the stator windings as the position signal for the rotor magnets. After detection, this signal is processed by digital circuits and sent to logic switching circuits to control the commutation of the brushless DC motor. By eliminating the need for position sensors, the structure of the brushless motor becomes more compact, leading to increasingly widespread application.

KATT motor classification

In a single-layer winding, only one effective side of a coil is placed in each stator slot, so the total number of coils is only half the total number of slots in the motor. The advantages of single-layer windings include fewer coils, simpler manufacturing processes, higher slot utilization due to the absence of inter-layer insulation, and no risk of phase-to-phase breakdown faults inherent in single-layer structures. The disadvantages are that the electromagnetic waveform generated by the winding is less ideal, resulting in higher iron losses and noise in the motor, as well as slightly poorer starting performance. Therefore, single-layer windings are generally used only in small-capacity asynchronous motors. Single-layer windings can be classified into several forms based on the shape of the coils and the arrangement of the end connections, such as chain windings, cross-chain windings, concentric windings, and cross-concentric windings. Chain windings consist of single-layer coil elements with identical shapes and widths, named because the ends of the coils resemble linked chains. A special note for single-layer chain windings is that the coil pitch must be an odd number; otherwise, the winding cannot be arranged. Cross-chain windings are used when the number of slots per pole per phase 9 is an odd number greater than 2, making chain winding arrangement impossible; in this case, a cross-type winding with single and double coils is required. In concentric windings, all coils within the same pole-phase group surround the same center. When the number of slots per pole per phase Q is an even number greater than 2, concentric windings can be adopted. The advantages of single-layer concentric and cross-concentric windings are simpler winding and embedding processes, while the disadvantage is that the long coil ends consume excessive wire. Apart from occasional use in small-capacity 2-pole and 4-pole motors, this winding form is rarely used today.

KATT motor structure

A motor can be regarded as a DC motor where mechanical commutation is replaced by an electronic commutation device. It mainly consists of a synchronous motor body, a power electronic inverter, a rotor position detector, and a controller. The rotor of the synchronous motor is mainly composed of permanent magnets and magnetic conductors. A permanent magnet brushless DC motor mainly consists of a permanent magnet motor body, a rotor position sensor, and an electronic commutation circuit. In terms of both structure and control method, permanent magnet brushless DC motors share many similarities with traditional DC motors: the rotor with permanent magnets replaces the stator poles of a brushed DC motor; the stator with multi-phase windings replaces the armature; and an electronic commutator composed of a solid-state inverter and a shaft position detector replaces the mechanical commutator and brushes.

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