MGM motor Germany MGM model MGM price

MGM motors are permanent magnet motors commutated or controlled by electronic circuits. Permanent magnet brushless motors come in two types: sine wave drive and square wave drive. Those with rectangular wave drive current are commonly referred to as permanent magnet brushless DC motors, while those with sine wave drive current are commonly referred to as permanent magnet AC servo motors. Based on sensor type, they can be classified into sensor-equipped motors and sensorless motors.

MGM motor speed control

Motor inverters are low-voltage inverters. The input side uses a transformer to step down high voltage to low voltage, replacing high-voltage motors with specialized low-voltage motors. Motor voltage levels vary, with no unified standard. Since low-voltage inverters are used, the capacity is relatively small, resulting in significant harmonics on the grid side. 12 pulse rectification can be used to reduce harmonics, but it does not meet strict harmonic requirements. When the inverter fails, the motor cannot be switched to line-frequency grid operation, which poses problems in applications where downtime is not permitted. Additionally, both the motor and cables must be replaced, involving substantial engineering work. Feeding part of the rotor energy of an asynchronous motor back to the grid changes the rotor slip to achieve speed control. This method uses thyristor technology and requires wound-rotor asynchronous motors. However, industrial sites today almost exclusively use squirrel-cage asynchronous motors, making motor replacement very troublesome. The speed control range of this method is generally around 70%-95%, which is narrow. Thyristor technology easily causes harmonic pollution to the grid. As speed decreases, the grid-side power factor also drops, requiring compensation measures. Its advantage is that the frequency conversion section has a smaller capacity, making it slightly lower in cost than other high-voltage AC variable frequency speed control technologies. A variation of this method is the internal feedback speed control system, which eliminates the transformer in the inverter section by integrating the feedback winding directly into the stator winding. This approach requires motor replacement, and its performance is similar to cascade speed control.

MGM motor mechanical characteristics

The advantages of this motor are its simple structure, absence of windings on the rotor, low maintenance costs, and long service life. It is used in many scenarios, covering almost all fields such as daily life, factory equipment, ports and terminals, and oil and coal mines. Squirrel-cage motors hold an important position in the large family of electric motors. Their advantages include simple structure, robustness and durability, reliable operation, high efficiency, convenient maintenance, and low price. Their disadvantages include low power factor and poor speed control performance (though speed control performance is improving with the emergence of single-winding multi-speed motors and the adoption of thyristor stepless speed control). Squirrel-cage motors have a wide range of applications and are widely used in China's industrial and agricultural production. According to statistics from relevant departments, approximately 90% of mechanically driven equipment uses squirrel-cage motors. This type of motor has the largest installed base, accounting for more than 85% of total power load consumption. Plant, mine, and rural electricians primarily install, maintain, and service these motors in their daily work. Since motor repair is complex, repair personnel require not only professional knowledge and technical skills but also various specialized equipment and tools, conditions that general electricians often lack, making motor repair challenging.

MGM motor speed control

Motor speed control: A hydraulic coupling is a hydraulic transmission device, generally consisting of a pump impeller and a turbine, collectively known as working wheels, housed in a sealed casing. The casing is filled with a certain amount of working fluid. When the pump impeller rotates under the drive of the prime mover, the fluid inside is pushed by the blades and rotates. Under centrifugal force, it enters the turbine along the outer ring of the pump impeller, exerting thrust on the turbine blades in the same direction of rotation, thereby driving the production machinery. The power transmission capacity of the hydraulic coupling is consistent with the relative fill level of the fluid in the casing. During operation, changing the fill rate changes the turbine speed of the coupling, achieving stepless speed control. Its characteristics are: 1, wide power adaptation range, meeting needs from tens of kilowatts to thousands of kilowatts; 2, simple structure, reliable operation, convenient use and maintenance, and low cost; 3, compact size and high capacity; 4, convenient control and regulation, easy to achieve automatic control. 5, this method is suitable for speed control of fans and water pumps. Variable frequency speed control range: 5-100 Hz stepless speed control. Below 50 Hz (60 Hz) is constant torque speed control; above 50 Hz (60 Hz) is constant power speed control. *Voltage boost via the VFD ensures the motor outputs rated torque at 5 Hz without overheating and burning out. *Smooth torque at low speeds, no crawling phenomenon. *The motor can withstand 160% overload of rated torque for 1 minutes. Equipped with a gear transmission motor (friction wheel) with variable transmission ratio.

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