AF Compressors motor, German AF Compressors model, AF Compressors price

AF Compressors motors are equipped with a set of adjustable eccentric blocks at each end of the rotor shaft. The excitation force is generated by the centrifugal force produced by the high-speed rotation of the shaft and eccentric blocks. Vibration motors have a wide vibration frequency range; mechanical noise can only be reduced when the excitation force and power are properly matched. Vibration motors are classified into six categories, including by starting and operating mode, and by operating speed.

AF Compressors motor fault handling

Incorrect motor winding connections result in an incomplete rotating magnetic field, causing symptoms such as difficult starting, unbalanced three-phase current, and high noise. If not addressed promptly, severe cases can lead to winding burnout. The main situations include: one or several coils in a pole phase installed in reverse or with head/tail connections swapped; pole (phase) groups connected in reverse; a phase winding connected in reverse; multi-parallel winding branches connected incorrectly; incorrect "delta" or "Y" connection. 1. Fault phenomena: The motor fails to start, no-load current is excessive or significantly unbalanced, temperature rises too quickly, severe vibration occurs with loud noise, or fuses blow. 2. Causes: Mistakenly connecting a "delta" configuration as "Y"; during maintenance, the head and tail of one phase in the three-phase windings are connected in reverse; inappropriate tap position selection for reduced-voltage starting or internal wiring errors; incorrect winding connections during new motor winding installation; incorrect identification of lead wires in old motors. 3. Inspection methods: (1) Ball test. If the ball rolls along the inner circumferential surface of the stator, the connection is correct; otherwise, there is a wiring error. (2) Compass test. If the windings are correctly connected, the polarity indicated by the compass should reverse when passing adjacent pole (phase) groups in a single-phase winding, and also reverse for adjacent pole (phase) groups of different phases in a three-phase winding. If the polarity direction remains unchanged, one pole (phase) group is reversed; if the indication is unstable, there are reversed coils within the phase group. (3) Multimeter voltage method. According to the wiring diagram, if the voltmeter shows no reading in both measurements, or shows a reading in one measurement but not the other, it indicates reversed windings. (4) Other common methods include the dry battery method, milliammeter residual magnetism method, and motor rotation direction method. 4. Remedial actions: (1) If a coil or coil group is connected in reverse, resulting in significant no-load current imbalance, the motor should be returned to the factory for repair. (2) If lead wires are incorrectly connected, correctly identify the head and tail ends and reconnect them. (3) For incorrect reduced-voltage starting connections, carefully verify against the wiring or schematic diagram and rewire. (4) If wiring errors occur during new motor winding installation or after rewinding, the motor should be sent to the factory for repair. (5) When one phase of the stator winding is reversed, the current in that phase will be exceptionally high; use this characteristic to locate and repair the fault. (6) If a "Y" connection is mistakenly made as a "delta" connection, or if the number of turns is insufficient, the no-load current will be high; correct this promptly. How to identify the same ends of the six lead wires of a three-phase asynchronous motor using a dry battery and a multimeter.

AF Compressors motor classification

Broad classification of motors: Motor types are very diverse. AC motors can be divided into low-speed and high-speed categories. Low-speed types are referred to as low-speed motors, AC low-speed motors; high-speed types are referred to as high-speed motors, high-speed electric motors, AC high-speed motors. High-speed motors are also known as motorized spindles or high-speed motorized spindles. The motorized spindle is a new technology that has emerged in the field of CNC machine tools in recent years, integrating the machine tool spindle with the spindle motor. Together with linear motor technology and high-speed tooling technology, it will usher in a new era of high-speed machining. A motorized spindle is an assembly comprising the spindle itself and its accessories: the motorized spindle, high-frequency variable frequency drive, oil mist lubricator, cooling unit, built-in encoder, and tool changing device. Motorized spindles typically use composite ceramic bearings, which are wear-resistant and heat-resistant, with a lifespan several times that of traditional bearings. Sometimes, magnetic levitation bearings or hydrostatic bearings are used, where the inner and outer rings do not contact, theoretically offering infinite life. The motorized spindle is the product of integrating an electric motor with the spindle; the motor's rotor serves as the rotating part of the spindle. Theoretically, a motorized spindle can be regarded as a high-speed electric motor. The key technology is dynamic balancing at high speeds. Lubrication for motorized spindles generally uses timed, metered oil-air lubrication. Grease lubrication can also be used, but the corresponding speed must be derated. "Timed" means injecting oil at fixed time intervals. "Metered" means precisely controlling the amount of lubricating oil each time via a device called a metering valve. Oil-air lubrication refers to lubricating oil being blown into the ceramic bearing carried by compressed air. Oil volume control is critical: too little fails to lubricate; too much causes heating due to oil resistance during high-speed bearing rotation. Cooling unit: To dissipate heat from the high-speed running motorized spindle as quickly as possible, circulating coolant is usually passed through the outer wall of the spindle. The cooling unit's function is to maintain the coolant temperature. To enable automatic tool changing and rigid tapping, the motorized spindle has a built-in pulse encoder for accurate phase angle control and coordination with feed. For application in machining centers, the motorized spindle is equipped with an automatic tool changing device, including disc springs and tool pulling cylinders, etc. 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 appeared. To achieve speeds of tens of thousands or even over one hundred thousand RPM for the motorized spindle, a high-frequency variable frequency drive must be used to drive the built-in high-speed motor. The output frequency of the inverter must reach hundreds or thousands of Hertz.

AF Compressors motor structure

Motors mainly consist of components such as the rotor, end covers, and stator. The stator structure of a permanent magnet synchronous motor is very similar to that of a conventional induction motor. The main difference in the rotor structure compared to an asynchronous motor is the presence of high-quality permanent magnet poles on the rotor. Depending on the placement of the permanent magnets on the rotor, permanent magnet synchronous motors are typically divided into surface-mounted rotor structures and interior-mounted rotor structures. The placement of permanent magnets significantly affects 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 generates very little asynchronous torque, making it suitable only for applications with low starting requirements; it is rarely used. Interior-mounted rotor structure: The permanent magnets are located within the core between the squirrel cage bars and the shaft. It offers good starting performance, and the vast majority of permanent magnet synchronous motors adopt this structure.

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