MATTEI motor Germany MATTEI model MATTEI price

MATTEI motor refers to a motor that, under standard environmental conditions, operates continuously with 100% rated load within the 10%~100% rated speed range, without the temperature rise exceeding the motor's specified permissible value. For asynchronous motors, when the slip variation is small, the speed is proportional to the frequency; thus, changing the power supply frequency changes the speed of the asynchronous motor. During variable frequency speed control, it is always desired to keep the main magnetic flux constant. If the main magnetic flux is greater than the flux during normal operation, the magnetic circuit becomes oversaturated, causing an increase in excitation current and a decrease in power factor; if the main magnetic flux is less than the flux during normal operation, the motor torque decreases.

MATTEI motor applications

The motor stator produces a stationary magnetic field. This stationary magnetic field surrounds the armature (or rotor). An external power source excites the armature magnetic field. A DC brushed motor also has two arc-shaped copper segments on the motor shaft, called commutator segments. As the motor rotates, carbon brushes slide on the commutator. This generates a rotating magnetic field that is attracted to the stator's stationary magnetic field. The current in the armature and stator windings is supplied by a battery or other DC power source (permanent magnet DC brushed motors do not have stator windings). The battery (or DC power source) provides a constant DC voltage. The voltage amplitude determines the motor speed, so the battery or DC power source is a linear excitation source. The most effective way to change the speed of a DC brushed motor is to use pulse width modulation (pwm) technology. pwm technology switches a constant voltage source at a fixed frequency. Changing the pulse width of the pwm signal adjusts the motor speed. The ratio between the high and low levels of the pulse is called the duty cycle of the pwm signal. The amplitude of the DC battery level equals the average amplitude of the pwm signal. DC brushed motors have good starting and speed regulation performance and are often used in applications with high requirements for starting and speed control, such as large reversible rolling mills, mine hoists, high-speed hotel elevators, gantry planers, electric locomotives, internal combustion locomotives, city trams, subway trains, electric bicycles, papermaking and printing machinery, marine machinery, large precision machine tools, and large cranes.

MATTEI motor speed control

An impeller is added between the motor shaft and the load shaft. By adjusting the pressure of the liquid (usually oil) between the impellers, the purpose of regulating the load speed is achieved. This speed control method is essentially a slip power consumption approach. Its main disadvantages are that efficiency decreases as speed drops, installation requires disconnecting the motor from the load, maintenance workload is high, and components such as shaft seals and bearings need to be replaced periodically. The site is generally dirty, making the equipment appear low-grade; this is an obsolete technology. Manufacturers who were initially interested in speed control technology either did not have high-voltage speed control options available at the time or considered cost factors, leading to some applications of fluid couplings. Examples include water pumps for water supply companies, boiler feed pumps and induced draft fans for power plants, and dust removal fans for steel mills. Today, some older equipment is gradually being replaced by high-voltage variable frequency drives during retrofits. The inverter is a low-voltage inverter, using an input step-down transformer and an output step-up transformer to interface with the high-voltage grid and the motor. This was a transitional technology when high-voltage variable frequency technology was not yet mature. Due to the low voltage of the low-voltage inverter, the current cannot increase indefinitely, which limits the capacity of this type of inverter. The presence of the output transformer reduces system efficiency and increases the footprint. Additionally, the magnetic coupling capability of the output transformer weakens at low frequencies, reducing the inverter's load-carrying capacity during startup. There is significant harmonic distortion to the grid. Using 12 pulse rectification can reduce harmonics, but it does not meet strict harmonic requirements. The output transformer amplifies the dv/dt generated by the inverter to the same extent, so filters must be installed to make it suitable for ordinary motors; otherwise, corona discharge and insulation damage may occur. Using special variable frequency motors can avoid this situation, but it is not as advantageous as using high-low type inverters.

MATTEI motor installation

Motor installation: 1. Preparation before installation: Before unpacking the motor, check whether the packaging is intact and undamaged, and whether there is any sign of moisture. After removing the cover, carefully clean dust and anti-rust layers from the motor. Carefully inspect for deformation and damage during transportation, check whether fasteners are loose or missing, verify whether the rotor rotates flexibly, and ensure nameplate data meets requirements. Use a 500VMQ meter to measure high-voltage resistance. The insulation resistance should not be lower than 1MQ; otherwise, the windings should be dried, but the treatment temperature must not exceed 120℃. 2. Motor installation site and foundation: The altitude of the motor installation site should not exceed 1000m. The installation site for general-purpose motors should be dry and clean. There should be good ventilation around the motor, and sufficient space should be left from other equipment to facilitate inspection, monitoring, and cleaning. The ambient temperature should be below 40℃, and strong radiation must be prevented. The installation foundation must be solid and firm with sufficient rigidity, and the mounting surface should be flat to ensure balanced motor operation. 3. Motor wiring: The motor should be properly grounded. Grounding devices are located at the bottom right of the junction box and on the frame housing. If necessary, grounding can also be achieved using the motor foot or flange mounting bolts to ensure safe motor operation. 4. Connection of the motor to the mechanical load: The motor can be connected to the load machinery using a coupling, spur gear, or belt. For double-shaft extension motors, only coupling transmission is allowed on the fan end. When using a coupling connection, the centerline of the motor shaft must align with the centerline of the load machinery shaft to avoid strong vibration, coupling misalignment, and abnormal noise during motor operation.

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