KBK motor Germany KBK model KBK price

KBK motors are a new generation of gear reduction motors, featuring compact size, low noise, maintenance-free operation, and an attractive appearance. The speed ranges from 0.83r/min to 300r/min. This series of low-speed motors is a new high-tech product that integrates electromagnetic drive and reduction mechanism within the motor housing. The low speed and high torque can directly meet customer requirements without the need for additional reduction devices. The motor adopts Class B and Class F insulation, with protection ratings of IP44 and IP55, and voltages of 220V and 380V.

KBK motor starting method

Motor starting methods include direct-on-line starting and reduced-voltage starting. Reduced-voltage starting includes: autotransformer compensation starting, star-delta switching starting, and extended-delta starting. Generally, small and medium-sized squirrel-cage asynchronous motors can be started directly. Direct starting features simple equipment and straightforward methods, but results in high starting current and low starting torque. Large-capacity squirrel-cage asynchronous motors generally start by reducing the voltage at the stator winding terminals. Reduced-voltage starting decreases the starting current, but inevitably reduces the starting torque as well. Various reduced-voltage starting methods are introduced below: Autotransformer compensation starting: Starting voltage = voltage drop coefficient × rated voltage; Starting current = voltage drop coefficient × starting current (direct); Starting torque = square of voltage drop coefficient × starting torque (direct). Characteristics of the starting method: The motor stator winding starts via an autotransformer for voltage reduction, and the autotransformer is disconnected after starting. Advantages and disadvantages: 1 Low starting current, 2 Starting control equipment cannot be complex, 3 Equipment is relatively expensive, but the starting torque is greater than that of star-delta switching, so it is widely used. Star-delta switching starting: Starting voltage = 0.577 × rated voltage; Starting current = 1/3 × starting current (direct); Starting torque = 1/3 × starting torque (direct). Characteristics of the starting method: The motor stator winding is connected in star configuration during starting, and switched to delta configuration after starting. Advantages and disadvantages: 1 Low starting current, 2 Low starting torque, 3 Frequent starting is possible, 4 Low price, suitable for motors with delta-connected stator windings, generally used for light-load starting of small-capacity motors. Extended-delta starting: Starting voltage = 0.78 × rated voltage (depends on stator winding tap voltage); Starting current = 0.6 × starting current (direct); Starting torque = 0.6 × starting torque (direct). Characteristics of the starting method: The motor stator winding is connected in an extended-delta configuration during starting, and switched to delta configuration after starting. Advantages and disadvantages: 1 Relatively low starting current, 2 Relatively high starting torque, 3 Frequent starting is possible, 4 Only applicable to motors with intermediate taps in the stator winding. Secondly, soft starters and variable frequency drives (VFDs) are widely used. They are convenient to control and suitable for promotion in small-capacity equipment. However, they should be used with caution for large-capacity, high-voltage motors. Although this technology is mature, the presence of non-linear components in the circuit generates significant harmonic pollution to the power supply. Despite the availability of harmonic mitigation equipment, highly irregular waveforms still exist in low-voltage circuits, affecting the normal operation of office electronic equipment and potentially causing capacitor breakdown in the circuit.

KBK motor applications

Motor applications are very widespread, such as in automobiles, tools, industrial control, automation, and aerospace. In general, brushless DC motors can be divided into three main categories of applications: Continuous load applications: Primarily fields requiring a certain speed but not high speed precision, such as fans, water pumps, and blowers. These applications have lower costs and mostly use open-loop control. Variable load applications: Primarily applications where speed needs to vary within a certain range, with higher demands on motor speed characteristics and dynamic response time. Good examples include spin dryers and compressors in household appliances, as well as oil pump control, electronic controllers, and engine control in the automotive industry. The system costs for these applications are relatively higher. Positioning applications: Most industrial control and automatic control applications fall into this category. These applications often involve energy transmission, so there are special requirements for dynamic speed response and torque, as well as higher requirements for controllers. Photoelectric and some synchronous devices may be used for speed measurement. Process control, mechanical control, and transport control belong to this type of application. Practical new types of brushless motors are closely linked to developments in electronic technology, microelectronics, digital technology, automatic control technology, and materials science. They are not limited to AC/DC fields but also involve energy conversion for motoring and generating, as well as signal sensing. There are many varieties of new brushless motors in the motor field, but the application of high-performance brushless motors is not yet widespread due to price constraints. The following explores and studies the main types of new brushless motors.

KBK motor advantages

Advantages of motors: Compared to asynchronous motors, permanent magnet synchronous motors have much higher efficiency values under light load. Their high-efficiency operating range is wide, with efficiency greater than 90% in the range of 25% to 120%. The rated efficiency of permanent magnet synchronous motors can meet the Level 1 energy efficiency requirements of current national standards, which is their biggest advantage in energy saving compared to asynchronous motors. In actual operation, motors rarely run at full power when driving loads. The reasons are: On one hand, designers generally determine motor power based on the extreme operating conditions of the load, but extreme conditions occur rarely. At the same time, to prevent motor burnout under abnormal conditions, designers further leave a power margin for the motor. On the other hand, motor manufacturers usually leave a certain power margin beyond the user's required power to ensure motor reliability. This results in most actually running motors operating below 70% of their rated power, especially when driving fan or pump loads, where motors typically operate in the light-load region. For asynchronous motors, light-load efficiency is very low, whereas permanent magnet synchronous motors can maintain high efficiency even in the light-load region.

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