LTA Lufttechnik motor, German LTA Lufttechnik model, LTA Lufttechnik price

LTA Lufttechnik motors refer to motors with speeds exceeding 10000r/min. Due to their high speed, their volume is much smaller than that of ordinary motors of the same power. Connected directly to the prime mover, they eliminate traditional reduction gears. With low rotational inertia, high-speed motors offer advantages such as high power density, effective material savings, high transmission efficiency, low noise, and fast dynamic response.

LTA Lufttechnik motor control methods

Motor constant voltage-to-frequency ratio control method: The constant voltage-to-frequency ratio control method for permanent magnet synchronous motors is similar to that for AC induction motors. It controls the amplitude and frequency of the motor input voltage to change simultaneously, thereby keeping the motor flux constant. The constant voltage-to-frequency ratio control method can meet the requirements of wide-range speed regulation systems. Even without feedback of physical signals such as current, voltage, or position, it can still achieve a certain control accuracy, which is the greatest advantage of the constant voltage-to-frequency ratio control method. This control method features simple algorithms and low hardware costs, and has been widely used in the field of general-purpose variable frequency drives. The disadvantages of the constant voltage-to-frequency ratio control method are also obvious. Since there is no feedback of speed, position, or any other signals during the control process, it is almost impossible to obtain information on the motor's operating status, let alone precisely control speed or electromagnetic torque. System performance is average, and dynamic response is poor, especially when the target speed changes or the load changes suddenly, making it prone to issues such as step-out and oscillation. Obviously, this control method cannot separately control torque and excitation current, and large excitation currents often exist during the control process, affecting motor efficiency. Therefore, this control method is commonly used in general-purpose variable frequency drives with lower performance requirements, such as air conditioners, conveyor belt drive control in production lines, and energy-saving operation of water pumps and fans.

LTA Lufttechnik motor advantages

Advantages of the motor: 1. Low losses and low temperature rise. Since the magnetic field of a permanent magnet synchronous motor is generated by permanent magnets, excitation losses (i.e., copper losses) caused by generating the magnetic field through excitation current are avoided. There is no current in the rotor during operation, which significantly reduces the motor temperature rise; under the same load conditions, the temperature rise is more than 20K lower. 2. High power factor. The power factor of a permanent magnet synchronous motor is high and independent of the number of motor poles. At full load, the power factor approaches 1. Compared with asynchronous motors, this results in lower motor current, correspondingly lower stator copper losses, and higher efficiency. In contrast, the power factor of asynchronous motors decreases as the number of poles increases. Furthermore, due to the high power factor of permanent magnet synchronous motors, the capacity of the associated power supply (transformer) can theoretically be reduced, allowing for a reduction in the specifications of associated switchgear and cables. 3. High efficiency. Compared with asynchronous motors, permanent magnet synchronous motors have significantly higher efficiency values at light loads and a wide high-efficiency operating range. Within the range of 25% to 120%, the efficiency is greater than 90%. The rated efficiency of permanent magnet synchronous motors can meet the Class 1 energy efficiency requirements of the current national standard, which is their greatest advantage in energy saving compared to asynchronous motors. In actual operation, motors rarely operate at full power when driving loads. This is because, on one hand, designers generally determine the motor power based on the extreme operating conditions of the load, but such extreme conditions occur infrequently. Additionally, to prevent motor burnout under abnormal conditions, a power margin is further reserved during design. On the other hand, to ensure motor reliability, manufacturers usually reserve a certain power margin beyond the user's required power. As a result, most motors in actual operation work below 70% of their rated power, especially when driving fan or pump loads, where the motor typically operates in the light-load region. For asynchronous motors, efficiency is very low at light loads, whereas permanent magnet synchronous motors can still maintain high efficiency in the light-load region. 4. Other advantages. Permanent magnet synchronous motors also offer high starting torque, short starting time, and high overload capacity. The installed capacity of the equipment drive motor can be reduced based on the actual shaft power, saving energy and reducing fixed asset investment. Control of permanent magnet synchronous motors is convenient, with constant speed that does not vary with load or voltage fluctuations, depending only on frequency, ensuring smooth and reliable operation. Due to strict speed synchronization and good dynamic response performance, they are suitable for variable frequency control. The installation dimensions of permanent magnet synchronous motors comply with IEC standards, allowing direct replacement of three-phase asynchronous motors. The protection rating can achieve IP54 and IP55, and some manufacturers also produce explosion-proof permanent magnet synchronous motors.

LTA Lufttechnik motor structure

Motors are mainly composed 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 an ordinary 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 usually divided into surface-mounted rotor structures and interior-mounted rotor structures. The placement of permanent magnets has a significant impact on 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, and thus rarely used. Interior-mounted rotor structure: The permanent magnets are located in the core between the squirrel-cage bars and the shaft. This structure offers good starting performance, and the vast majority of permanent magnet synchronous motors adopt this structure.

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