AKH motor, German AKH model, AKH price

AKH motors are named for their armature winding and field winding connected in series. Single-phase series-wound motors are AC/DC universal motors; they can operate on either AC or DC power supplies. The single-phase series-wound motor is widely used. Its advantages include high speed, high starting torque, compact size, light weight, resistance to stalling, and a wide applicable voltage range. Speed control via voltage adjustment is simple and easy to implement.

AKH motor classification

In broad terms, motor types are very diverse. AC motors can be divided into low-speed and high-speed categories. Low-speed types are called low-speed motors or AC low-speed motors. High-speed types are called high-speed motors, high-speed electric motors, or AC high-speed motors. High-speed motors are also known as motorized spindles or high-speed motorized spindles. The motorized spindle is a recent technology in the CNC machine tool sector that integrates the machine spindle with the spindle motor. Together with linear motor technology and high-speed tooling technology, it is ushering high-speed machining into a new era. A motorized spindle is an assembly comprising the spindle itself and its accessories: the motorized spindle, high-frequency VFD, oil-mist lubricator, cooling unit, built-in encoder, and tool-changing mechanism. Motorized spindles typically use hybrid ceramic bearings, which are wear- and heat-resistant and offer several times the service life of traditional bearings. Electromagnetic suspension bearings or hydrostatic bearings are sometimes used; with no contact between inner and outer rings, theoretical service life is infinite. The motorized spindle integrates the electric motor and the spindle; the motor rotor serves as the rotating part of the spindle, so the motorized spindle can theoretically be regarded as a high-speed electric motor. The key technology is dynamic balancing at high speeds. Lubrication of motorized spindles generally uses timed, metered oil-air lubrication. Grease lubrication is also possible, but corresponding speed ratings must be derated. Timed means oil is injected at fixed intervals. Metered means a device called a metering valve precisely controls the amount of lubricating oil each time. Oil-air lubrication means the lubricating oil is carried by compressed air into the ceramic bearing. Oil volume control is critical: too little fails to lubricate; too much causes heating due to oil drag during high-speed bearing rotation. Cooling unit: To dissipate heat from the high-speed motorized spindle as quickly as possible, coolant is usually circulated through the outer wall of the spindle; the cooling unit maintains the coolant temperature. To enable automatic tool changing and rigid tapping, the motorized spindle incorporates a pulse encoder for accurate phase-angle control and synchronization with feed. For machining center applications, the motorized spindle is equipped with an automatic tool-changing mechanism, including disc springs and a tool-pulling hydraulic cylinder. The widely known BT and ISO tools have been proven unsuitable for high-speed machining. In such cases, high-speed tools such as HSK and SKI have emerged. To achieve rotational speeds of tens of thousands to over one hundred thousand RPM for the motorized spindle, a high-frequency VFD is required to drive the built-in high-speed motor; the VFD output frequency must reach hundreds or thousands of hertz.

AKH motor troubleshooting

Motor measurement terminals. (1) First, identify the two ends (start and finish) of each of the three-phase windings. Set the multimeter to the resistance range for measurement. Coils belonging to the same phase are connected and show no resistance, while coils not belonging to the same phase are not conductive. Therefore, the multimeter can be used to determine which two wire ends belong to the lead wires of the same phase winding. (2) Identify the homologous terminals (polarity) of the lead wires of any two phase windings. Set the analog multimeter to the DC current range with the smallest scale. Connect the two wire ends of one phase winding to the multimeter probes. Then, briefly touch the two wire ends of another phase winding to the positive and negative terminals of a dry cell battery. At the moment the battery is connected to the coil, if the meter needle deflects toward the greater-than-zero side (i.e., clockwise), the battery's positive terminal and the multimeter's black probe are connected to the homologous terminals; otherwise, they are opposite. Daily maintenance content for continuously operating three-phase asynchronous motors: visual inspection; check whether the fan is working properly; check for abnormal vibration; check whether the coupling connection is reliable; check whether the base mounting is secure; check whether the bearings are working properly (by listening to the sound); check whether the temperature is normal (using an infrared thermometer); regularly inspect wire connections and switch contacts; check whether the operating current is normal (using a clamp-on ammeter); additionally, for wound-rotor motors, inspect the carbon brushes and slip rings.

AKH motor applications

A single-phase motor refers to an induction motor powered by a 220V AC single-phase supply. Because 220V power supply is convenient and economical, and household electricity is also 220V, single-phase motors are not only widely used in production but also closely related to daily life. Especially as living standards rise, the use of single-phase motors in household appliances continues to increase. Production applications include micro water pumps, grinders, threshers, crushers, woodworking machinery, and medical devices. Household applications include electric fans, hair dryers, exhaust fans, washing machines, and refrigerators. There are many types, but power ratings are relatively low. These motors typically have two-phase windings on the stator and a standard squirrel-cage rotor. Different arrangements of the two-phase windings on the stator and different supply conditions produce different starting and running characteristics.

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