Lafert group motor Germany Lafert group model Lafert group price

Lafert group motor refers to the engine that controls the operation of mechanical components in a servo system; it is an auxiliary motor indirect speed change device. Servo motors can control speed with very accurate position precision, converting voltage signals into torque and rotational speed to drive controlled objects. The rotor speed of a servo motor is controlled by the input signal and responds quickly. In automatic control systems, it serves as an actuator, featuring small electromechanical time constants and high linearity, converting received electrical signals into angular displacement or angular velocity output on the motor shaft. Divided into two major categories: DC and AC servo motors. Their main characteristic is that there is no self-rotation when the signal voltage is zero, and the speed decreases uniformly as torque increases.

Lafert group motor starting methods

Motor starting methods include direct starting and reduced-voltage starting. Reduced-voltage starting includes: autotransformer compensation starting, star-delta switching starting, and extended delta starting. Generally, small and medium-sized squirrel-cage asynchronous motors can be started directly; direct starting equipment is simple and the method is convenient. However, the starting current is large and the starting torque is small. Large-capacity squirrel-cage asynchronous motors generally start by reducing the terminal voltage of the stator winding. During reduced-voltage starting, the starting current can be reduced, but the starting torque is also inevitably reduced. Various reduced-voltage starting methods are introduced as follows: Autotransformer compensation starting: Starting voltage = voltage drop coefficient multiplied by rated voltage; Starting current = voltage drop coefficient multiplied by starting current (direct); Starting torque = square of voltage drop coefficient * multiplied by starting torque (direct); Characteristics of the starting method: The motor stator winding starts via an autotransformer for voltage reduction, and the autotransformer is disconnected after starting; Advantages and disadvantages: 1 small starting current, 2 starting control equipment cannot be complex, 3 equipment is relatively expensive, but the starting torque is larger than that of the star-delta conversion method, so it is used more frequently. Star-delta conversion starting: Starting voltage = 0.577 * rated voltage; Starting current = 1/3 * starting current (direct); Starting torque = 1/3 * starting torque (direct); Characteristics of the starting method: The motor stator winding is connected in star configuration during starting, and switched to delta configuration after starting. Advantages and disadvantages: 1 small starting current, 2 small starting torque, 3 frequent starting is possible, 4 low price, suitable for motors with delta-connected stator windings, generally used for light-load starting of small-capacity motors. Extended delta starting: Starting voltage = 0.78 * rated voltage (depends on stator winding tap voltage); Starting current = 0.6 * starting current (direct); Starting torque = 0.6 * starting torque (direct); Characteristics of the starting method: The motor stator winding is connected in extended delta configuration during starting, and switched to delta configuration after starting. Advantages and disadvantages: 1 relatively small starting current, 2 relatively large starting torque, 3 frequent starting is possible, 4 only applicable to motors with intermediate taps on the stator winding. Secondly, soft starters and variable frequency drives are widely used. For small-capacity equipment, they are easy to promote and control. For large-capacity, high-voltage motors, use with caution. Although the technology is mature, the presence of nonlinear components in the circuit generates significant harmonic content, polluting the power supply. Despite the availability of harmonic mitigation equipment, highly irregular waveforms still exist in low-voltage circuits, affecting the normal operation of office electronic equipment and potentially causing capacitor breakdown in the circuit.

Lafert group motor differences

The biggest difference between motors lies in whether their rotor speed is consistent with the stator rotating magnetic field. If the rotor speed is the same as the stator rotating magnetic field, it is called a synchronous motor; otherwise, it is called an asynchronous motor. Additionally, the stator windings of synchronous and asynchronous motors are identical; the difference lies in the rotor structure. The rotor of an asynchronous motor consists of short-circuited windings, generating current through electromagnetic induction. The rotor structure of a synchronous motor is relatively complex, featuring DC excitation windings, thus requiring an external excitation power source to introduce current through slip rings. Therefore, the structure of synchronous motors is relatively complex, and the manufacturing and maintenance costs are relatively higher. Compared to asynchronous motors which can only absorb reactive power, synchronous motors can generate reactive power as well as absorb it! The speed of a synchronous motor is synchronized with the electromagnetic speed, whereas the speed of an asynchronous motor is lower than the electromagnetic speed. For a synchronous motor, as long as it does not lose synchronism, the speed remains constant regardless of load size. The speed of an asynchronous motor changes constantly with the load. Synchronous motors offer high precision but have complex manufacturing, high cost, and relatively difficult maintenance. Asynchronous motors, although slower in response, are easy to install and use, and are inexpensive. Therefore, synchronous motors are not as widely applied as asynchronous motors. Synchronous motors are mostly used in large generators, while asynchronous motors are used in almost all electric motor applications.

Lafert group motor applications

Compared with traditional reactive motors, the hybrid stepper motor has permanent magnets added to the rotor structure to provide the operating point for soft magnetic materials. The stator excitation only needs to provide a changing magnetic field without consuming energy to establish the operating point of the magnetic material. Therefore, this motor has high efficiency, low current, and low heat generation. Due to the presence of permanent magnets, this motor has strong back EMF and good inherent damping, resulting in smooth operation, low noise, and low-frequency vibration. To some extent, the hybrid stepper motor can be regarded as a low-speed synchronous motor. A four-phase motor can operate in four-phase mode or two-phase mode (bipolar voltage drive must be used), whereas a reactive motor cannot. For example, four-phase, eight-step operation (A-AB-B-BC-C-CD-D-DA-A) can fully adopt the two-phase eight-beat operation mode. It is not difficult to find that the conditions are C=, D=. The internal winding of a two-phase motor is completely consistent with that of a four-phase motor. Low-power motors are generally directly connected as two-phase. For higher-power motors, to facilitate use and flexibly change the dynamic characteristics of the motor, the external wiring often consists of eight leads (four-phase). In this case, it can be used as a four-phase motor, or the two-phase motor windings can be used in series or parallel.

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