Georgii Kobold motor, German Georgii Kobold model, Georgii Kobold price

Georgii Kobold motors are rotating machines containing a brush assembly that convert DC electrical energy into mechanical energy (DC motor) or mechanical energy into DC electrical energy (DC generator). Unlike brushless DC motors, the brush assembly is used to introduce or extract DC voltage and current. DC brushed motors are the foundation of all motors; they feature fast starting, timely braking, smooth speed regulation over a wide range, and relatively simple control circuits.

Georgii Kobold motor common issues

Why do motors generate shaft current? The current in the loop formed by the motor shaft, bearing housing, and base is called shaft current. Causes of shaft current: (1) Asymmetric magnetic field; (2) Harmonics in the supply current; (3) Poor manufacturing or installation causing uneven air gap due to rotor eccentricity; (4) Gaps between the two halves of a detachable stator core; (5) Improper selection of the number of segments in a fan-shaped laminated stator core. Hazards: Erosion of the motor bearing surface or balls, forming pinpoint micro-pores, deteriorating bearing performance, increasing friction loss and heat generation, and ultimately causing bearing burnout. Prevention: (1) Eliminate pulsating magnetic flux and power supply harmonics (e.g., by installing AC reactors on the inverter output side); (2) During motor design, insulate the bearing housing and base of sliding bearings, and insulate the outer ring and end cover of rolling bearings. Two. Why can general-purpose motors not be used in high-altitude areas? Altitude adversely affects motor temperature rise, motor corona (in high-voltage motors), and commutation in DC motors. Attention should be paid to the following three aspects: (1) At high altitudes, motor temperature rise increases and output power decreases. However, if the drop in ambient temperature with altitude sufficiently compensates for the effect on temperature rise, the motor's rated output power can remain unchanged; (2) Anti-corona measures must be taken when using high-voltage motors at high altitudes; (3) Altitude adversely affects DC motor commutation; attention must be paid to the selection of carbon brush materials. Three. Why should motors not operate under light load? Light-load operation of motors results in: (1) Low motor power factor; (2) Low motor efficiency. This leads to equipment waste and uneconomical operation. (1) Excessive load; (2) Phase loss; (3) Blocked air ducts; (4) Prolonged low-speed operation; (5) Excessive power supply harmonics. Four. Why should motors in cold environments not be started arbitrarily? Prolonged exposure of motors to low-temperature environments can cause: (1) Cracking of motor insulation; (2) Freezing of bearing grease; (3) Pulverization of solder at wire joints. Therefore, motors should be stored with heating in cold environments, and windings and bearings should be inspected before operation. Five. What are the causes of three-phase current imbalance in motors? (1) Three-phase voltage imbalance; (2) Poor welding or contact in a specific phase branch inside the motor; (3) Inter-turn short circuit in motor windings, or short circuit to ground or between phases; (4) Wiring errors.

Georgii Kobold motor structure

Motor rotor structure: The rotor is the rotating part of a three-phase asynchronous motor, consisting of the rotor core, rotor winding, shaft, and fan. The rotor core is also part of the motor's magnetic circuit, made of stacked silicon steel sheets with uniform slots punched on the outer circumference, and fixed to the shaft. The rotor winding is placed in the slots of the rotor core. Depending on the rotor winding structure, three-phase asynchronous motors are classified as squirrel-cage or wound-rotor types. The rotor winding of a squirrel-cage asynchronous motor is named for its resemblance to a squirrel cage; its structure consists of copper bars embedded in the slots as conductors, with the ends of the copper bars welded together by short-circuit rings. Small and medium-sized squirrel-cage asynchronous motors use cheaper aluminum instead of copper, casting the rotor conductors, short-circuit rings, and fan into a single unit to form a cast-aluminum squirrel-cage rotor. The core of a wound rotor is identical to that of a squirrel-cage rotor. The rotor winding is similar to the stator winding, made of insulated wire wound according to a specific pattern and embedded in the rotor slots to form a three-phase symmetrical winding. Typically, the ends of the three windings are connected together, and the start terminals are connected to three mutually insulated copper slip rings fixed on the shaft, forming a star connection. The rotor winding is connected to an external three-phase rheostat via the slip rings and brushes above them, for motor starting and speed regulation within a small range. Squirrel-cage and wound-rotor three-phase asynchronous motors operate on the same principle, differing only in the rotor winding structure.

Georgii Kobold motor mechanical characteristics

There are two methods for changing the direction of motor rotation: one is the armature reversal method, which keeps the polarity of the terminal voltage of the field winding unchanged and reverses the motor by changing the polarity of the terminal voltage of the armature winding; the other is the field winding reversal method, which keeps the polarity of the terminal voltage of the armature winding unchanged and changes the motor direction by changing the polarity of the terminal voltage of the field winding. When the voltage polarity of both is changed simultaneously, the rotation direction of the motor remains unchanged. Separately excited and shunt DC motors generally use the armature reversal method to achieve forward and reverse rotation. Separately excited and shunt DC motors are not suitable for using the field winding reversal method to achieve forward and reverse rotation because the field winding has many turns and large inductance. Reversing the field winding generates a large induced electromotive force in the field winding, which can damage the switch and the insulation of the field winding. Series DC motors are suitable for using the field winding reversal method to achieve forward and reverse rotation because the voltage across the armature terminals of a series DC motor is high, while the voltage across the field winding terminals is low, making reversal easy; electric locomotives often use this method.

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