Yanmar motor Germany Yanmar model Yanmar price

Yanmar motor refers to the engine that controls the operation of mechanical components in a servo system; it is an auxiliary motor indirect speed change device. Servo motors can control speed with very accurate position precision, converting voltage signals into torque and rotational speed to drive the controlled object. The rotor speed of the servo motor is controlled by the input signal and can respond quickly. In automatic control systems, it is used as an actuator and features small electromechanical time constants and high linearity, converting received electrical signals into angular displacement or angular velocity output on the motor shaft. They are divided into two major categories: DC and AC servo motors. Their main characteristic is that there is no self-rotation when the signal voltage is zero, and the rotational speed decreases uniformly as the torque increases.

Yanmar motor structure

The motor body is similar to a Permanent Magnet Synchronous Motor (PMSM). The rotor uses permanent magnets, often rare-earth permanent magnet materials, but lacks cage windings and other starting devices. The stator windings use AC winding configurations, generally supporting multi-phase (three-phase, four-phase, or five-phase). The rotor consists of permanent magnet steel arranged with specific pole pairs (2P=2, 4, 6...). The design requires obtaining a trapezoidal wave with a top width of 120° in the stator windings; therefore, the winding configuration often adopts full-pitch, concentrated, or near full-pitch, concentrated forms to retain other harmonics in the magnetic flux density. Brushed DC motors rely on mechanical commutators to convert DC current into approximately trapezoidal AC current supplied to the armature windings, while Brushless DC Motors (BLDCM) rely on electronic commutators to input square wave currents sequentially into each phase of the stator armature windings according to a specific phase sequence. When a phase of the stator winding in a brushless DC motor is energized, the magnetic field generated by the current in that phase interacts with the magnetic field produced by the rotor permanent magnets to generate torque, driving the rotor to rotate. Position sensors convert the rotor magnet position into electrical signals to control electronic switching circuits, thereby conducting the stator windings in a specific order. This ensures that the phase current of the stator commutates in the correct sequence as the rotor position changes. This allows the electronic magnetic field to change continuously with the rotation of the rotor, generating a rotating magnetic field synchronous with the rotor speed, and keeping the spatial angle between the stator magnetic field and the rotor magnetic field at approximately 90°, pushing the rotor to rotate with maximum torque. Since the conduction sequence of the electronic switching circuit is synchronous with the rotor angle, it performs the commutation function of a mechanical commutator, ensuring that the stator and rotor magnetic fields remain basically perpendicular during operation to improve efficiency. Therefore, in terms of basic structure, a brushless DC motor can be considered a "self-synchronous motor system" composed of electronic switch commutation current, a permanent magnet synchronous motor, and position sensors, which will not lose step during operation. The rotor structure of permanent magnet brushless motors (BLDCM) includes both traditional inner rotor structures and new structural forms such as disc-type, outer rotor, and linear structures.

Yanmar motor classification

Motors can be classified based on the excitation of their mover into conventional linear synchronous motors with DC-excited mover poles and permanent magnet linear synchronous motors with permanent magnet mover poles. In the former, the magnitude of the excitation magnetic field is determined by the magnitude of the DC current. By controlling the excitation current, the tangential traction force and lateral attraction force of the motor can be changed. This motor structure allows the tangential and lateral forces to be controlled separately. In permanent magnet linear synchronous motors, the pole magnetic field is provided by permanent magnets, requiring no external power supply for excitation of the pole mover, which simplifies the motor structure and improves overall efficiency, although the pole magnetic field is not adjustable.

Yanmar motor power frequency conversion

Motor power supply: AC motors generally use a three-phase system because three-phase AC motors have obvious advantages over single-phase motors in terms of performance indicators, raw material utilization, and price. Three-phase motors of the same power are smaller, lighter, and cheaper than single-phase motors. Three-phase motors have self-starting capability. Single-phase motors lack starting torque, so special measures are required to solve the starting problem. The torque of single-phase motors is pulsating, and the noise is relatively high, but the required power supply is simpler, making them very convenient for household use. Therefore, small household motors and instrument motors mostly use single-phase motors. Frequency converters are power transmission components that control AC motors by applying frequency conversion technology and microelectronics to change the frequency and amplitude of the motor's working power supply. Characteristics of AC motor speed control frequency converters: ■ Low-frequency torque output 180%, good low-frequency operating characteristics, maximum output frequency 600Hz, capable of controlling high-speed motors, comprehensive detection and protection functions (overvoltage, undervoltage, overload), restart after instantaneous power failure, protection functions such as acceleration, deceleration, and stall prevention during operation, automatic identification of motor dynamic parameters to ensure system stability and accuracy, fast response during high-speed stopping, rich and flexible input/output interfaces and control methods, and strong universality.

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