AHS motor Germany AHS model AHS price

AHS motor refers to a low-power single-phase asynchronous motor powered by a single-phase AC 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.

AHS motor classification

The motor rotor is made with salient poles. The field coils mounted on the pole cores are connected in series, arranged with alternating opposite polarities, and have two lead wires connected to two slip rings mounted on the shaft. The field coil is excited by a small DC generator or a battery. In most synchronous motors, the DC generator is mounted on the motor shaft to supply the excitation current for the rotor pole coils. Since this type of synchronous motor cannot start automatically, a squirrel-cage winding is also installed on the rotor for starting purposes. The squirrel-cage winding is placed around the periphery of the rotor, with a structure similar to that of an asynchronous motor. When a three-phase AC power supply is applied to the stator windings, a rotating magnetic field is generated within the motor. The squirrel-cage winding cuts the magnetic flux lines, generating induced current, which causes the motor to rotate. After the motor starts rotating, its speed gradually increases to slightly below the speed of the rotating magnetic field. At this point, the rotor field coils are excited by DC current, forming specific magnetic poles on the rotor. These poles attempt to track the rotating magnetic poles on the stator, thereby increasing the rotor speed until it rotates synchronously with the rotating magnetic field.

AHS motor structure

The motor armature core is the main part of the main magnetic circuit and is used to house the armature windings. Generally, the armature core is made by stacking laminations punched from silicon steel sheets with a thickness of 0.5mm, to reduce eddy current losses and hysteresis losses generated in the armature core during motor operation. The stacked core is fixed to the rotating shaft or rotor bracket. Armature slots are opened on the outer circumference of the core, and the armature windings are embedded in these slots. The function of the armature winding is to generate electromagnetic torque and induced electromotive force (EMF). It is a key component for energy conversion in DC motors, hence the name 'armature'. It consists of many coils (hereinafter referred to as elements) connected according to a specific pattern. The coils are wound using high-strength enamel-covered wire or glass-fiber-covered flat copper wire. The coil sides of different coils are embedded in the armature slots in upper and lower layers. Proper insulation must be maintained between the coils and the core, as well as between the upper and lower layers of coil sides. To prevent centrifugal force from throwing the coil sides out of the slots, the slot openings are secured with slot wedges. The end connections of the coils extending outside the slots are bound with thermosetting non-latex glass tape. In DC motors, the commutator, paired with brushes, converts the external DC power supply into alternating current in the armature coils, keeping the direction of the electromagnetic torque constant. In DC generators, the commutator, paired with brushes, converts the alternating EMF induced in the armature coils into DC EMF drawn from the positive and negative brushes. The commutator is a cylinder composed of many commutator segments, insulated from each other by mica sheets. The rotating shaft supports the rotation of the rotor and requires sufficient mechanical strength and rigidity; it is generally machined from round steel.

AHS motor advantages

The motor operates in a self-controlled manner, so it does not require additional starting windings on the rotor like synchronous motors under heavy-load starting with variable frequency speed control, nor does it produce oscillation and loss of synchronism during sudden load changes. The permanent magnets in small and medium-capacity brushless DC motors mostly use rare-earth neodymium-iron-boron (Nd-Fe-B) materials with high magnetic energy product. Therefore, the volume of rare-earth permanent magnet brushless motors is one frame size smaller than that of three-phase asynchronous motors of the same capacity. Research on variable frequency speed control of asynchronous motors over the past thirty years has ultimately been seeking methods to control asynchronous motor torque. Rare-earth permanent magnet brushless DC motors will surely show advantages in the field of speed control due to their wide speed regulation range, small size, high efficiency, and small steady-state speed error. Because brushless DC motors possess the characteristics of DC brushed motors and are also devices with variable frequency, they are also known as DC variable frequency drives; the internationally common term is BLDC. The operating efficiency, low-speed torque, and speed accuracy of brushless DC motors are better than those of inverters using any other control technology, making them worthy of attention in the industry. Products have been produced exceeding 55kW, and can be designed up to 400kW, meeting the industry's needs for energy saving and high-performance driving.

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