Kretzschmar Antriebstechnik motor, Germany Kretzschmar Antriebstechnik model, Kretzschmar Antriebstechnik price

Kretzschmar Antriebstechnik 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 permissible 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 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 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.

Kretzschmar Antriebstechnik motor advantages

What are the advantages of this motor compared to other motors: 1, Precision: Achieves closed-loop control of position, speed, and torque; overcomes the step loss problem of stepper motors; 2, Speed: Good high-speed performance, with general rated speeds reaching 2000～3000 rpm; 3, Adaptability: Strong overload capacity, capable of withstanding loads three times the rated torque, particularly suitable for occasions with instantaneous load fluctuations and requirements for rapid starting; 4, Stability: Smooth low-speed operation, without producing stepping phenomena similar to stepper motors during low-speed operation. Suitable for occasions requiring high-speed response; 5, Responsiveness: The dynamic response time for motor acceleration and deceleration is short, generally within tens of milliseconds; 6, Comfort: Heat generation and noise are significantly reduced. Simply put: ordinary motors seen in daily use continue to rotate for a while due to inertia after power is cut off, then stop. Servo motors and stepper motors stop and start immediately, with extremely fast response. However, stepper motors exhibit step loss. The application fields of servo motors are extensive. Generally, any equipment requiring a power source and precision may involve servo motors, such as machine tools, printing equipment, packaging equipment, textile equipment, laser processing equipment, robots, and automated production lines, which have relatively high requirements for process precision, processing efficiency, and operational reliability.

Kretzschmar Antriebstechnik motor classification

The motor swaps the stator and rotor of a conventional DC motor. Its rotor is a permanent magnet generating air gap flux; the stator is the armature, composed of multi-phase windings. Structurally, it is similar to a permanent magnet synchronous motor. The stator structure of a brushless DC motor is the same as that of a conventional synchronous or induction motor. Multi-phase windings (three-phase, four-phase, five-phase, etc.) are embedded in the iron core. The windings can be connected in star or delta configurations and respectively connected to the power transistors of the inverter for proper commutation. The rotor mostly uses rare-earth materials with high coercivity and high remanence density, such as samarium-cobalt or neodymium-iron-boron. Due to the different positions of the magnetic material in the magnetic poles, they can be classified into surface-mounted poles, embedded poles, and ring-shaped poles. Since the motor body is a permanent magnet motor, brushless DC motors are habitually called permanent magnet brushless DC motors. Brushed DC motor: The 2 brushes (copper brushes or carbon brushes) of a brushed motor are fixed on the motor rear cover via an insulating seat, directly introducing the positive and negative poles of the power supply to the commutator on the rotor. The commutator connects the coils on the rotor, and the polarity of the 3 coils alternates continuously, interacting with the 2 fixed magnets on the housing to generate rotation. Since the commutator is fixed to the rotor and the brushes are fixed to the housing (stator), friction between the brushes and the commutator during motor rotation generates significant resistance and heat. Therefore, brushed motors have low efficiency and high losses. However, they also have the advantages of simple manufacturing and low cost.

Kretzschmar Antriebstechnik motor structure

The motor rotor consists of the rotor core, rotor winding, and shaft. The rotor core is also part of the motor's magnetic circuit and is made of stacked silicon steel sheets. Unlike the stator core laminations, the rotor core laminations have slots on their outer circumference. After stacking, the outer cylindrical surface of the rotor core uniformly forms many identical slots for placing the rotor winding. The rotor winding is another part of the induction motor circuit; its function is to cut the stator magnetic field, generating induced electromotive force and current, and under the action of the magnetic field, it experiences force, causing the rotor to rotate. Its structure can be divided into two types: squirrel-cage winding and wound-rotor winding. The main characteristics of these two rotors are as follows: the squirrel-cage rotor has a simple structure, is easy to manufacture, economical, and durable; the wound-rotor has a complex structure and is expensive, but external resistance can be introduced into the rotor circuit to improve starting and speed control performance. The squirrel-cage rotor winding consists of conductor bars placed in the rotor slots and end rings at both ends. To save steel and increase productivity, the conductor bars and end rings of low-power induction motors are generally cast in one piece from molten aluminum. For high-power motors, due to the difficulty in ensuring the quality of cast aluminum, copper bars are commonly inserted into the rotor core slots, and end rings are welded on at both ends. The squirrel-cage rotor winding is self-closed and does not require an external power supply. Its shape resembles a cage, hence the name squirrel-cage rotor.

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