FEIN motor Germany FEIN model FEIN price

FEIN motors are named for their armature winding and field winding connected in series. Single-phase series-wound motors are AC/DC universal motors; they can operate on either AC or DC power supplies. The single-phase series motor is widely used. Its advantages include high speed, high starting torque, compact size, light weight, resistance to stalling, and a wide operating voltage range. Speed control can be achieved simply by adjusting the voltage.

FEIN motor fault analysis

The oil pressure in the motor fuel system has a direct effect on the mixture concentration, so the fuel pressure should be checked first. The method is: connect a fuel pressure gauge to the fuel line, then start the engine and measure the fuel pressure. If the fuel pressure is too high, replace the pressure regulator. If the pressure is too low, pinch the return hose; if the fuel pressure rises to the normal value, the fuel pressure regulator is faulty; otherwise, check the fuel pump and fuel filter. After shutdown, the fuel pressure should remain at the specified value of 5min; otherwise, it indicates injector leakage, causing an overly rich mixture. When starting is difficult, the fuel pump usually works normally; the problem is often a clogged pump strainer preventing sufficient fuel intake or a blocked fuel filter causing insufficient supply system pressure. Some models have a cold-start injector that enriches the mixture during cold starts to improve performance. The cold-start injector is controlled by the ignition switch and a thermo-time switch. The injection duration depends on the current in the heating coil of the thermo-time switch and the coolant temperature. Common cold-start system faults include: the cold-start injector being clogged with deposits, affecting atomization and causing hard cold starts; failure of the cold-start injector; or a short circuit (contacts normally closed) or open circuit (normally open) in the thermo-time switch. If the contacts are normally closed, the thermo-time switch will continue to command excessive fuel injection from the cold-start injector when the engine is warm, causing hard hot starts. If the thermo-time switch is shorted, the cold-start injector will never operate, causing hard cold starts.

FEIN 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 DC battery level amplitude equals the average amplitude of the pwm signal. DC brushed motors have good starting and speed control 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, planer-type milling machines, electric locomotives, internal combustion locomotives, city trams, subway trains, electric bicycles, papermaking and printing machinery, marine machinery, large precision machine tools, and large cranes.

FEIN motor structure

A motor that requires only a single-phase AC power supply is called a single-phase motor. A single-phase asynchronous motor consists of a stator, rotor, bearings, housing, and end shields. The stator consists of a frame and a laminated core with windings. The core is made of stacked silicon steel sheets with slots. Two sets of main windings (also called running windings) and auxiliary windings (also called starting windings or secondary windings) are embedded in the slots, spaced 90° electrical degrees apart. The main winding is connected to the AC power supply. The auxiliary winding is connected in series with a centrifugal switch S or a starting capacitor, running capacitor, etc., before being connected to the power supply. The rotor is a squirrel-cage cast-aluminum rotor. It is made by casting aluminum into the slots of the laminated core and casting end rings together, shorting the rotor bars to form a squirrel cage. Single-phase asynchronous motors are further divided into single-phase resistance-start asynchronous motors, single-phase capacitor-start asynchronous motors, single-phase capacitor-run asynchronous motors, and single-phase dual-value capacitor asynchronous motors.

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