BKW-Kuema motor Germany BKW-Kuema model BKW-Kuema price

BKW-Kuema 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 of an asynchronous motor does not change significantly, 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 generally 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 the excitation current to increase and the power factor to decrease; if the main magnetic flux is less than the flux during normal operation, the motor torque decreases.

BKW-Kuema motor applications

The most widely used motors are AC asynchronous motors (also known as induction motors). They are easy to use, reliable, low-cost, and robust in structure, but have a low power factor and difficult speed control. Synchronous motors are commonly used for high-capacity, low-speed prime movers. Synchronous motors not only have a high power factor, but their speed is independent of the load size and depends only on the grid frequency, resulting in stable operation. DC motors are often used in applications requiring wide-range speed control. However, they have commutators, complex structures, high prices, difficult maintenance, and are unsuitable for harsh environments. After the 20th century, 70s, with the development of power electronics technology, AC motor speed control technology has gradually matured, equipment prices have continued to decrease, and it has begun to be applied. The maximum output mechanical power that a motor can handle without causing overheating under specified operating modes (continuous, short-time, intermittent periodic) is called its rated power, and the specifications on the nameplate should be noted during use. When the motor is running, care must be taken to match the characteristics of the load with those of the motor to avoid runaway or stalling. Motors can provide a wide range of power, from milliwatts to tens of thousands of kilowatts. The use and control of motors are very convenient, with capabilities such as self-starting, acceleration, braking, reversing, and holding, meeting various operational requirements; motors have high efficiency, produce no smoke, dust, or odor, do not pollute the environment, and have low noise. Due to these advantages, they are widely used in industrial and agricultural production, transportation, national defense, commerce, household appliances, and medical electrical equipment. Generally, when a motor's speed is adjusted, its output power changes with the speed.

BKW-Kuema motor fault handling

Motor winding open circuits: Poor welding or the use of corrosive flux that is not cleaned after welding may cause cold solder joints or loosening; mechanical stress or collision can cause coil short circuits, and short-to-ground faults can also burn out wires. When one or several wires in a bundle are shorted, the remaining wires experience increased current and rising temperature, causing the winding to overheat and open. Common faults include open circuits at the end of a phase winding, inter-turn short circuits, open circuits at parallel branch connections, open circuits in one of several parallel wires, and rotor cage breaks. 1. Fault phenomena: The motor cannot start, three-phase current is unbalanced, there is abnormal noise or excessive vibration, temperature rise exceeds allowable limits, or smoke is emitted. 2. Causes: (1) Wires broken during inspection and maintenance or manufacturing quality issues. (2) Poor welding of winding components, pole (phase) groups, and connections between windings and lead wires, leading to desoldering due to long-term overheating. (3) Winding damage or breakage caused by mechanical forces and electromagnetic field forces. (4) Severe burning or fusing of windings caused by inter-turn or phase-to-phase short circuits and ground faults. 3. Inspection methods: (1) Visual inspection. Breakpoints mostly occur at the winding ends; check for bends, breaks, or desoldered joints. (2) Multimeter method. Using the resistance range, for "Y" connection, connect one probe to the center point of the "Y" shape and the other probe sequentially to the start terminals of the three-phase windings; the phase showing infinite resistance is the open circuit. For "△" connection, disconnect the links and measure each winding group separately; infinite resistance indicates the breakpoint. (3) Test lamp method. Similar to the above; the phase where the lamp does not light is the open circuit. (4) Megohmmeter method. The phase with resistance tending towards infinity (i.e., not zero) is the breakpoint. (5) Ammeter method. When the motor is running, measure the three-phase current with an ammeter. If the three-phase current is unbalanced and there is no short circuit phenomenon, the phase with lower current has a partial open/short circuit fault. (6) Bridge method. When the resistance of one phase is higher than the other two, it indicates a partial open circuit fault in that phase winding. (7) Current balance method. For "Y" connection, connect the three-phase windings in parallel and apply low-voltage, high-current AC. If the current difference among the three phases is greater than 10%, the side with lower current is the open circuit. For "△" connection, first disconnect one connection point of the stator winding, then apply low-voltage, high-current to each phase sequentially; the phase with lower current is the open circuit. (8) Rotor cage tester inspection method. During inspection, if the rotor cage is broken, the millivolt meter reading should decrease. 4. Open circuit treatment methods: (1) If the open circuit is at the end, reconnect and solder firmly, wrap with insulating material, sleeve with insulating tubing, bind securely, and then dry. (2) Windings severely burned due to inter-turn, phase-to-phase short circuits, and ground faults should generally be replaced with new windings. (3) For breakpoints inside the slots, perform emergency treatment for a small number of breakpoints: use the group elimination method to find the breakpoint, reconnect at the break, and use after ensuring proper insulation. (4) For squirrel-cage rotor breaks, repair using welding, cold joining, or bar replacement methods.

BKW-Kuema 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 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; some motors mainly operate as generators, while others mainly operate as motors. AC motors are divided into synchronous and asynchronous motors by type. The rotor speed ns of a synchronous motor is the same as the speed of the rotating magnetic field, called synchronous speed. ns has a strict relationship with 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 asynchronous motor rotor speed and the rotating magnetic field speed (called slip) is usually within 10%.

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