Ruhrgetriebe Rgm motor, German Ruhrgetriebe Rgm model, Ruhrgetriebe Rgm price

Ruhrgetriebe Rgm motors refer to electric motors with a rated voltage above 1000V. Commonly used voltages are 6000V and 10000V. Due to differences in foreign power grids, there are also voltage levels of 3300V and 6600V. High-voltage motors are developed because motor power is proportional to the product of voltage and current. Therefore, when the power of low-voltage motors increases to a certain extent (such as 300KW/380V), the current is limited by the allowable carrying capacity of the wires, making it difficult to increase further or resulting in excessive costs. It is necessary to increase the voltage to achieve high power output. The advantages of high-voltage motors are high power and strong ability to withstand shocks; the disadvantages are high inertia, making starting and braking difficult.

Ruhrgetriebe Rgm motor advantages

The motor's magnetic field is generated by permanent magnets, thereby avoiding excitation losses (i.e., copper losses) caused by generating the magnetic field through excitation current. With no current in the rotor, the motor temperature rise is significantly reduced, being more than 20K lower under the same load conditions. Permanent magnet synchronous motors have a high power factor, which is independent of the number of motor poles. At full load, the power factor approaches 1, resulting in lower motor current compared to asynchronous motors, consequently reducing stator copper losses and achieving 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 downsizing of associated switchgear and cable specifications. Permanent magnet synchronous motors also offer advantages such as high starting torque, short starting time, and high overload capability. This allows for a reduction in the installed capacity of the drive motor based on the actual shaft power, saving energy and reducing fixed asset investment. Permanent magnet synchronous motors are easy to control, maintain constant speed unaffected by load or voltage fluctuations, depending only on frequency, ensuring smooth and reliable operation. Due to strict speed synchronization and good dynamic response, 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.

Ruhrgetriebe Rgm motor classification

Motors can be classified in the following two ways: AC motors are usually divided into AC generators, AC motors, and synchronous condensers based on their function. Due to the reversibility of motor operating states, the same motor can serve as either a generator or a motor. Dividing motors strictly into generators and motors is not entirely accurate; rather, some motors mainly operate as generators, while others mainly operate as motors. AC motors are categorized into synchronous motors and asynchronous motors. The rotor speed ns of a synchronous motor is the same as the speed of the rotating magnetic field, known as the synchronous speed. There is a strict relationship between ns, the frequency of the connected AC power (f), and the number of pole pairs of the motor (P). ns = 60f/P. With a power frequency of 50 Hz, the synchronous speed of a one-pole-pair three-phase AC motor is 3000 rpm, and the synchronous speed of a two-pole-pair three-phase AC motor is 1500 rpm, and so on. The rotor speed of an asynchronous motor is always lower or higher than the speed of its rotating magnetic field, hence the name 'asynchronous'. The difference between the rotor speed and the rotating magnetic field speed of an asynchronous motor (known as slip) is typically within 10%.

Ruhrgetriebe Rgm motor cooling methods

Motor cooling methods include: 1) Cooling: During energy conversion, a small portion of losses is always converted into heat, which must be continuously dissipated through the motor housing and the surrounding medium. This process of heat dissipation is called cooling. 2) Cooling medium: A gaseous or liquid medium that transfers heat. 3) Primary cooling medium: A gaseous or liquid medium with a temperature lower than that of a specific motor component, which comes into contact with that component and carries away the heat released. 4) Secondary cooling medium: A gaseous or liquid medium with a temperature lower than that of the primary cooling medium, which removes the heat released by the primary cooling medium through the motor's outer surface or cooler. 5) Final cooling medium: The final medium to which heat is transferred. 6) Ambient cooling medium: The gaseous or liquid medium in the motor's surrounding environment. 7) Remote medium: A medium located far from the motor, which absorbs heat from the motor and discharges the cooling medium to a remote location through inlet and outlet pipes or channels. 8) Cooler: A device that transfers heat from one cooling medium to another while keeping the two cooling media separated.

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