mogensen motor Germany mogensen model mogensen price

mogensen motor refers to a motor that, under standard environmental conditions, operates continuously at 100% rated load within the 10%~100% rated speed range, with temperature rise not exceeding the motor's specified allowable value. When the slip variation of an asynchronous motor 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.

mogensen motor structure

The motor consists of two basic parts: a stationary stator and a rotating rotor. The rotor is installed inside the stator cavity and supported on two end covers by bearings. To ensure the rotor can rotate freely within the stator, there must be a gap between the stator and the rotor, known as the air gap. The air gap of an electric motor is a very important parameter; its size and symmetry significantly affect the motor's performance. Figure 2 shows the components of a three-phase squirrel-cage asynchronous motor. The stator consists of three-phase stator windings, a stator core, and a frame. The three-phase stator windings constitute the electrical circuit part of the asynchronous motor and play a crucial role in its operation, serving as the key component for converting electrical energy into mechanical energy. The structure of the three-phase stator windings is symmetrical, generally having six output terminals U1, U2, V1, V2, W1, W2, located in the terminal box outside the frame. They are connected in star (Y) or delta (△) configuration as required. The stator core is part of the magnetic circuit of the asynchronous motor. Since the main magnetic field rotates relative to the stator at synchronous speed, to reduce losses induced in the core, the core is laminated from high-permeability silicon steel sheets 0.5mm thick. Both sides of the silicon steel sheets are coated with insulating varnish to reduce eddy current losses in the core. The frame, also known as the housing, primarily supports the stator core and withstands the reaction forces generated during full motor load operation. Heat generated by internal losses during operation is also dissipated outward through the frame. Frames for medium and small motors are generally made of cast iron. For large motors, where casting is inconvenient due to size, welded steel plates are commonly used.

mogensen motor fault analysis

The influencing factors and inspection methods for difficult cold starts and difficult hot starts in motor faults are largely similar. Regarding mixture concentration, there are two conditions: mixture too lean and mixture too rich. Faults affecting fuel supply may occur in fuel quality, fuel pump, fuel filter, fuel pressure regulator, cold start system, injectors, and water temperature sensor. Faults affecting intake air mostly manifest as clogged air filters, intake system leaks, and idle speed control faults.

mogensen motor speed control

Motor pole-changing speed control achieves speed regulation by altering the wiring method of the stator windings to change the number of pole pairs in the squirrel-cage motor stator. Variable frequency speed control changes the frequency of the stator power supply to the motor, thereby changing its synchronous speed. The main equipment in a variable frequency speed control system is the inverter, which provides variable frequency power. Inverters can be divided into two categories: AC-DC-AC inverters and AC-AC inverters. In China, AC-DC-AC inverters are predominantly used. Cascade speed control involves inserting an adjustable additional electromotive force into the rotor circuit of a wound-rotor motor to change the motor's slip, achieving speed control. Most of the slip power is absorbed by the inserted additional electromotive force, and then utilized by generating additional devices to return the absorbed slip power to the grid or convert the energy for use. Based on the method of absorbing and utilizing slip power, cascade speed control can be classified into motor cascade speed control, mechanical cascade speed control, and thyristor cascade speed control, with thyristor cascade speed control being widely adopted. Inserting additional resistance into the rotor of a wound-rotor asynchronous motor increases the motor's slip, causing the motor to operate at a lower speed. The larger the inserted resistance, the lower the motor speed. This method features simple equipment and convenient control, but the slip power is consumed as heat in the resistor. It belongs to stepped speed control, with relatively soft mechanical characteristics. Changing the stator voltage of the motor yields a set of different mechanical characteristic curves, thereby obtaining different speeds. Since the motor torque is proportional to the square of the voltage, the maximum torque drops significantly, resulting in a narrow speed control range, making it difficult to apply to general squirrel-cage motors. To expand the speed control range, voltage-regulation speed control should employ squirrel-cage motors with high rotor resistance, such as torque motors specifically designed for voltage-regulation speed control, or connect frequency-sensitive resistors in series with wound-rotor motors. To expand the stable operating range, feedback control should be adopted for speed control ratios above 2:1 to achieve automatic speed regulation. The main device for voltage-regulation speed control is a power supply capable of providing voltage variation. Common voltage regulation methods include series saturated reactors, autotransformers, and thyristor voltage regulation. Thyristor voltage regulation is the optimal method.

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