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Buehler Motor motor refers to a low-power single-phase asynchronous motor powered by a single-phase AC power supply (AC220V). This type of motor typically has two-phase windings on the stator, and the rotor is of the standard squirrel-cage type. Different distributions of the two-phase windings on the stator and different power supply conditions can produce different starting and operating characteristics.

Buehler Motor motor working principle

The motor contains fixed ring-shaped permanent magnets. Current flowing through the coils on the rotor generates Ampere force. When the coils on the rotor are parallel to the magnetic field, continuing to rotate changes the direction of the magnetic field experienced. Therefore, at this time, the brushes at the end of the rotor alternately contact the commutator segments, changing the direction of the current in the coils. The direction of the generated Lorentz force remains unchanged, allowing the motor to maintain rotation in one direction. The working principle of a DC generator is to convert the alternating electromotive force induced in the armature coils into direct electromotive force when drawn from the brush terminals, relying on the commutation action of the commutator in conjunction with the brushes. The direction of the induced electromotive force is determined by the right-hand rule (magnetic field lines point into the palm, the thumb points in the direction of conductor motion, and the other four fingers point in the direction of the induced electromotive force in the conductor). The direction of the force on the conductor is determined by the left-hand rule. This pair of electromagnetic forces forms a torque acting on the armature, known as electromagnetic torque in rotating motors. The direction of the torque is counter-clockwise, attempting to rotate the armature counter-clockwise. If this electromagnetic torque can overcome the resisting torque on the armature (such as resisting torque caused by friction and other load torques), the armature will rotate counter-clockwise.

Buehler Motor motor mechanical characteristics

Because the rotor of a three-phase asynchronous motor rotates in the same direction but at a different speed than the stator's rotating magnetic field, there is slip, hence the name three-phase asynchronous motor. The rotor speed of a three-phase asynchronous motor is lower than the speed of the rotating magnetic field. The rotor windings generate electromotive force and current due to relative motion with the magnetic field, and interact with the magnetic field to produce electromagnetic torque, achieving energy conversion. Compared with single-phase asynchronous motors, three-phase asynchronous motors have better operating performance and can save various materials. Depending on the rotor structure, three-phase asynchronous motors can be divided into cage-type and wound-rotor types. Cage-rotor asynchronous motors have a simple structure, reliable operation, light weight, and low price, leading to widespread application; their main disadvantage is difficult speed regulation. Wound-rotor three-phase asynchronous motors have three-phase windings on both the rotor and stator, connected to external rheostats via slip rings and brushes. Adjusting the resistance of the rheostat can improve the motor's starting performance and regulate the motor's speed.

Buehler Motor motor structure

A motor that requires only a single-phase AC power supply is called a single-phase motor. A single-phase asynchronous motor consists of a stator, rotor, bearings, housing, end caps, etc. The stator is composed of a frame and an iron core with windings. The iron core is made by punching and stacking silicon steel sheets. Two sets of main windings (also called running windings) and auxiliary windings (also called starting windings or secondary windings) spaced 90° electrical degrees apart in space are embedded in the slots. The main winding is connected to the AC power supply. The auxiliary winding is connected in series with a centrifugal switch S or starting capacitor, running capacitor, etc., before being connected to the power supply. The rotor is a cage-type cast aluminum rotor, formed by casting aluminum into the slots of the stacked iron core and casting end rings together, short-circuiting the rotor bars to form a squirrel-cage shape. Single-phase asynchronous motors are further classified into single-phase resistance-start asynchronous motors, single-phase capacitor-start asynchronous motors, single-phase capacitor-run asynchronous motors, and single-phase dual-value capacitor asynchronous motors.

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