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Dyadic motor is a commonly used AC motor. The synchronous motor is the heart of the power system; it is a component that integrates rotation and stationary parts, electromagnetic changes and mechanical motion, to realize the conversion between electrical energy and mechanical energy. Its dynamic performance is very complex, and its dynamic performance has a great impact on the dynamic performance of the entire power system. The characteristic is: during steady-state operation, there is an invariant relationship between the rotor speed and the grid frequency: n=ns=60f/p, where f is the grid frequency, p is the number of pole pairs of the motor, and ns is called the synchronous speed. If the grid frequency remains constant, the speed of the synchronous motor is always constant in steady state and independent of the load magnitude. Synchronous motors are divided into synchronous generators and synchronous motors. AC machines in modern power plants are mainly synchronous generators.

Dyadic motor structure

The motor is mainly composed 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 biggest difference in the rotor structure compared to an asynchronous motor is the placement of high-quality permanent magnet poles on the rotor. Depending on the position of the permanent magnets on the rotor, permanent magnet synchronous motors are usually divided into surface-mounted rotor structures and interior-mounted rotor structures. The placement of permanent magnets has a significant impact on motor performance. Surface-mounted rotor structure: the permanent magnets are located on the outer surface of the rotor core. This rotor structure is simple, but the generated asynchronous torque is very small, making it suitable only for applications with low starting requirements, and thus rarely used. Interior-mounted rotor structure: the permanent magnets are located in the core between the squirrel-cage bars and the shaft. It has good starting performance, and the vast majority of permanent magnet synchronous motors adopt this structure.

Dyadic motor applications

Applications of motors in precision machining: To improve productivity and enhance machining quality, ultra-high-speed and ultra-high-precision machining are key. Currently, the feed speed requirements for CNC machine tools have increased from 6～8m/min to greater than 50～60m/min, and acceleration requirements have reached 1～5g. This specification cannot be achieved by traditional feed drive systems with intermediate transmission and conversion stages, necessitating the search for a new actuator. This has led to the emergence of the new generation of linear motor feed drive systems. Since the end of the 20th century, the four major international machine tool exhibitions worldwide have shown that the direct application of linear motors to CNC machine tools, machining centers, presses, etc., is a trend. Linear motor drives feature high thrust, high speed, high precision, and smooth feed motion. The machine tool feed system adopts direct drive by linear synchronous motors. The biggest difference from the original rotary motor transmission method is the elimination of the mechanical intermediate transmission link between the motor and the worktable (slide), i.e., shortening the length of the machine tool feed transmission chain to zero. Hence, this transmission method is called "direct drive," also known as "zero transmission." Direct drive avoids disadvantages such as backlash, inertia, friction, and insufficient rigidity in lead screw transmissions, bringing performance indicators and advantages unattainable by the original rotary motor drive method.

Dyadic motor structure

The motor structure is basically the same as that of a DC motor, with different armature structures and excitation methods. In practice, slotted core armature structures are often used; conductors placed in armature slots are subjected to lower electromagnetic forces, making it easier to meet the mechanical strength requirements of insulation materials during high-speed operation. Although excitation methods can be made in series and shunt configurations, the torque of shunt motors is much lower than that of series motors. Therefore, DC motors are usually made with series excitation and slotted armatures. The stator of an AC/DC universal motor is equipped with main magnetic poles embedded with series windings, and the rotor is like the slotted armature of a DC motor; the magnetic circuits are both composed of laminated iron cores. Stator laminations facilitate manufacturing and reduce costs. Armature cores generally adopt a skewed slot form. The air gap between the stator and rotor is larger than that of a DC motor and is non-uniform, with the maximum air gap at the sharpest point being 3 to 4 times the main air gap. Other components such as brush holders and end covers are similar to those of ordinary DC motors. AC/DC universal motors have different structural forms and are sometimes made in split assemblies; the split assembly structure is similar to that of torque motors. For high-capacity, high-speed, or special requirement AC/DC universal motors, commutating poles are also required to improve commutation, suppress sparking, and reduce radio interference.

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