MOLL-MOTOR motor Germany MOLL-MOTOR model MOLL-MOTOR price

MOLL-MOTOR motors are a type of electric motor powered by simultaneously connecting to 380V three-phase AC current (phase difference 120 degrees). Because the rotor of a three-phase asynchronous motor rotates in the same direction but at a different speed than the stator's rotating magnetic field, there is slip, hence the name three-phase asynchronous motor. The rotor speed of a three-phase asynchronous motor is lower than the speed of the rotating magnetic field. The rotor windings generate electromotive force and current due to relative motion with the magnetic field, and interact with the magnetic field to produce electromagnetic torque, achieving energy conversion.

MOLL-MOTOR 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 a 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, consequently lower stator copper losses in the motor, and higher efficiency. In contrast, for asynchronous motors, the power factor decreases as the number of motor poles increases. Furthermore, because of 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 much higher efficiency values at light loads. They have 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 Level 1 energy efficiency requirements of the current national standard, which is their biggest advantage in energy saving compared to asynchronous motors. In actual operation, motors rarely operate at full power when driving loads. The reasons are: on one hand, when selecting motors, designers generally determine the motor power based on the extreme operating conditions of the load. However, extreme conditions occur rarely, and to prevent motor burnout under abnormal conditions, designers also leave a further power margin for the motor. On the other hand, to ensure motor reliability, manufacturers usually leave a certain power margin beyond the power requested by the user. This results in most actually operating motors working below 70% of their rated power, especially when driving fan or pump loads, where the motor usually operates in the light load region. For asynchronous motors, the light-load efficiency is very low, 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 capability. The installed capacity of equipment drive motors can be reduced based on the actual shaft power, saving energy while reducing investment in fixed assets. Permanent magnet synchronous motors are easy to control, with constant speed that does not vary with load fluctuations or voltage fluctuations, but depends only on frequency, ensuring smooth and reliable operation. Due to strict speed synchronization, they have good dynamic response performance and 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 reach IP54 and IP55, and some manufacturers also produce explosion-proof permanent magnet synchronous motors.

MOLL-MOTOR motor applications

The most widely used motors are AC asynchronous motors (also known as induction motors). They are easy to use, reliable in operation, low in price, and robust in structure, but have a lower power factor and more difficult speed regulation. Synchronous motors are commonly used for high-capacity, low-speed prime movers. Synchronous motors not only have a high power factor, but their speed is also independent of the load size, depending only on the grid frequency. They operate relatively stably. DC motors are often used in applications requiring wide-range speed regulation. However, they have commutators, complex structures, high prices, difficult maintenance, and are unsuitable for harsh environments. After the 20s and 70s, with the development of power electronics technology, AC motor speed control technology has gradually matured, equipment prices have continued to decrease, and they have begun to be applied. The maximum output mechanical power that a motor can bear without causing overheating under specified duty cycles (continuous duty, short-time duty, intermittent periodic duty) is called its rated power; attention should be paid to the ratings on the nameplate during use. During motor operation, care must be taken to match the characteristics of the load with those of the motor to avoid runaway or stalling. Motors can provide a wide range of power, from milliwatt level to ten-thousand-kilowatt level. The use and control of motors are very convenient, featuring capabilities such as self-starting, acceleration, braking, reversal, and holding, meeting various operational requirements. Motors have high working efficiency, produce no smoke or odor, do not pollute the environment, and generate low noise. Due to these series of advantages, they are widely used in industrial and agricultural production, transportation, national defense, commerce, household appliances, medical electrical equipment, and other fields. Generally, when a motor is speed-regulated, its output power varies with speed.

MOLL-MOTOR motor applications

A typical application of motors is traction for maglev trains. Their advantages of high speed, comfort, safety, no pollution, no noise, no vibration, and energy saving are increasingly favored. The primary part (stator assembly) is installed on the track, making the vehicle lighter, power supply more convenient, and technology simpler. Suspension coils generate electromagnetic attraction, pulling the vehicle from below towards the track and maintaining a certain vertical distance. Guidance coils generate magnetic forces to maintain a certain lateral distance between the vehicle and the track. All of this is ensured by a set of high-precision electronic adjustment systems, keeping the vehicle oriented and levitated unchanged while moving linearly at 10 to 15mm. Power for the suspension and guidance systems and onboard equipment is supplied by suspended linear generators. With superconducting suspension, the vehicle can be levitated to over 100mm. Application of motors in vertical lifting systems: As modern high-rise buildings become taller and underground mining goes deeper, the defects of traditional rope-based lifting systems become increasingly apparent, and the mechanical strength of lifting steel ropes has a limit. Lifting systems using permanent magnet linear synchronous motors are rope-less lifting systems, featuring unlimited lifting height (depth) by equipment, fewer equipment units, less space occupation, simplified lifting systems, improved system efficiency, reduced construction costs, and energy savings. A major advantage of linear motor lifting systems over rope lifting systems is the ability to achieve high-speed lifting unattainable by the latter, shortening the lifting cycle and improving work efficiency.

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