Afag motor Germany Afag model Afag price

Afag motors are devices that convert electrical energy into mechanical energy. They utilize energized coils (i.e., stator windings) to generate a rotating magnetic field, which acts on the rotor (such as a squirrel-cage closed aluminum frame) to form electromagnetic rotational torque. Motors are classified into DC motors and AC motors based on the power supply used. Most motors in power systems are AC motors, which can be synchronous or asynchronous (the speed of the motor's stator magnetic field does not remain synchronized with the rotor's rotational speed). A motor mainly consists of a stator and a rotor. The direction of force-induced motion of current-carrying conductors in a magnetic field is related to the direction of the current and the magnetic field lines (magnetic field direction). The working principle of a motor is that the magnetic field exerts force on the current, causing the motor to rotate.

Afag motor maintenance methods

Motor maintenance and repair center motor maintenance process: Clean stator and rotor → Replace carbon brushes or other components → Vacuum F grade pressure impregnation → Drying → Dynamic balancing correction. 1. The operating environment should be kept dry at all times; the motor surface should be kept clean, and the air inlet should not be obstructed by dust, fibers, etc. 2. When the thermal protection of the motor trips continuously, determine whether the fault originates from the motor itself, overload, or if the protection device setting value is too low. The motor may only be put into operation after the fault is eliminated. 3. Ensure good lubrication of the motor during operation. For general motors, lubricating grease should be replenished or replaced after approximately 5000 hours of operation. If bearing overheating or grease deterioration is detected during operation, replace the lubricating grease promptly. When replacing lubricating grease, remove the old lubricant and clean the bearing and bearing cap oil grooves with gasoline. Then fill the cavity between the inner and outer rings of the bearing with ZL-3 lithium-based grease to 1/2 (for 2-pole) and 2/3 (for 4, 6, 8-pole). 4. When the bearing reaches the end of its service life, the vibration and noise of the motor during operation will increase significantly. Replace the bearing when the radial clearance of the bearing reaches the following values. 5. When disassembling the motor, the rotor can be removed from either the shaft extension end or the non-extension end. If it is not necessary to remove the fan, it is more convenient to remove the rotor from the non-shaft extension end. When extracting the rotor from the stator, take care to prevent damage to the stator windings or insulation. 6. When replacing windings, record the original winding configuration, dimensions, number of turns, wire gauge, etc. If this data is lost, request it from the manufacturer. Arbitrarily changing the original design windings often degrades one or more performance characteristics of the motor, potentially rendering it unusable.

Afag motor working principle

Motor working principle: A servo system (servo mechanism) is an automatic control system that enables output controlled variables such as position, orientation, and state of an object to follow any change in the input target (or setpoint). Servo positioning relies primarily on pulses. Basically, it can be understood that when a servo motor receives 1 pulse, it rotates by the angle corresponding to 1 pulse, thereby achieving displacement. Because the servo motor itself has the function of emitting pulses, every time the servo motor rotates by an angle, it emits a corresponding number of pulses. This creates a response, or closed loop, with the pulses received by the servo motor. In this way, the system knows how many pulses were sent to the servo motor and how many pulses were received back, allowing precise control of the motor's rotation and thus achieving precise positioning, which can reach 0.001mm. DC servo motors are divided into brushed and brushless motors. Brushed motors have low cost, simple structure, high starting torque, wide speed regulation range, and easy control. They require maintenance, but maintenance is inconvenient (replacing carbon brushes), they generate electromagnetic interference, and have environmental requirements. Therefore, they can be used in cost-sensitive general industrial and civil applications. Brushless motors are small in size, light in weight, high in output, fast in response, high in speed, low in inertia, smooth in rotation, and stable in torque. Control is complex, but intelligence is easily achieved. Their electronic commutation method is flexible, allowing for square wave or sine wave commutation. The motors are maintenance-free, highly efficient, operate at low temperatures, have very low electromagnetic radiation, long service life, and can be used in various environments. AC servo motors are also brushless motors, divided into synchronous and asynchronous motors. Synchronous motors are generally used in motion control. They have a wide power range and can achieve very high power. They have high inertia, low maximum rotational speed, which decreases rapidly as power increases. Therefore, they are suitable for applications requiring smooth low-speed operation. The rotor inside the servo motor is a permanent magnet. The driver-controlled U/V/W three-phase electricity forms an electromagnetic field. The rotor rotates under the action of this magnetic field. At the same time, the encoder built into the motor feeds back signals to the driver. The driver compares the feedback value with the target value to adjust the rotation angle of the rotor. The precision of the servo motor is determined by the precision (line count) of the encoder. Functional differences between AC servo motors and brushless DC servo motors: AC servos are better because they use sine wave control, resulting in small torque ripple. DC servos use trapezoidal waves. However, DC servos are simpler and cheaper.

Afag motor speed regulation

Motor speed regulation: In wound-rotor asynchronous motors, additional resistance is inserted in series with the rotor circuit, increasing the slip of the motor and causing it to operate at a lower speed. The greater the inserted resistance, the lower the motor speed. This method features simple equipment and convenient control, but the slip power is consumed as heat in the resistor. It belongs to stepped speed regulation, and the mechanical characteristics are relatively soft. Voltage regulation speed control: Changing the stator voltage of the motor yields a set of different mechanical characteristic curves, thereby obtaining different speeds. Since the motor torque is proportional to the square of the voltage, the maximum torque drops significantly. The speed regulation range is small, making it difficult to apply to general squirrel-cage motors. To expand the speed regulation range, voltage regulation speed control should employ squirrel-cage motors with high rotor resistance, such as torque motors specifically designed for voltage regulation speed control, or connect frequency-sensitive resistors in series with wound-rotor motors. To expand the stable operating range, feedback control should be adopted to achieve automatic speed regulation when speed regulation is above 2:1. The main device for voltage regulation speed control is a power supply capable of providing variable voltage. Common voltage regulation methods include series-connected saturated reactors, autotransformers, and thyristor voltage regulation. Thyristor voltage regulation is the best. Characteristics of voltage regulation speed control: 1. The circuit is simple and easy to implement automatic control; 2. During voltage regulation, slip power is consumed as heat in the rotor resistance, resulting in low efficiency. 3. Voltage regulation speed control is generally suitable for production machinery below 100KW. Electromagnetic speed regulation: An electromagnetic speed-regulating motor consists of three parts: a squirrel-cage motor, an electromagnetic slip clutch, and a DC excitation power supply (controller). The DC excitation power supply has low power and is usually composed of a single-phase half-wave or full-wave thyristor rectifier. Changing the conduction angle of the thyristor changes the magnitude of the excitation current. The electromagnetic slip clutch consists of three parts: an armature, magnetic poles, and an excitation winding. The armature and the latter have no mechanical connection and can rotate freely. The armature is coaxially connected to the motor rotor, called the active part, driven by the motor. The magnetic poles are coupled to the load shaft via a coupling, called the driven part. When both the armature and magnetic poles are stationary, if DC current is applied to the excitation winding, several pairs of alternating N and S poles will form along the circumferential surface of the air gap, and their magnetic flux passes through the armature. When the armature rotates with the driving motor, relative motion between the armature and the magnetic poles induces eddy currents in the armature. These eddy currents interact with the magnetic flux to generate torque, driving the rotor with magnetic poles to rotate in the same direction. However, its speed is always lower than the armature speed N1. This is a slip speed regulation method. By varying the DC excitation current of the slip clutch, the output torque and speed of the clutch can be changed. Characteristics of electromagnetic speed-regulating motor speed regulation: 1. Simple device structure and control circuit, reliable operation, and convenient maintenance; 2. Smooth speed regulation, stepless speed regulation; 3. No harmonic impact on the power grid; 4. Large speed loss, low efficiency. 5. This method is suitable for medium and small power production machinery requiring smooth, short-term low-speed operation.

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