KSB motor Germany KSB model KSB price

KSB 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.

KSB motor operating mode

Several methods for obtaining excitation current for motors: 1, excitation method powered by a DC generator. Generators using this excitation method have a dedicated DC generator, known as a DC exciter. The exciter is generally coaxial with the generator, and the generator's field winding obtains DC current from the exciter via slip rings mounted on the main shaft and fixed brushes. This excitation method offers advantages such as independent excitation current, reliable operation, and reduced auxiliary power consumption. It was the main excitation method for generators in past decades and has mature operational experience. The disadvantages are slower excitation regulation speed and heavy maintenance workload, so it is rarely used in units above 10MW. 2, excitation method powered by an AC exciter. Some modern large-capacity generators use an AC exciter to provide excitation current. The AC exciter is also mounted on the generator's main shaft. Its output AC current is rectified to supply excitation to the generator rotor. In this case, the generator's excitation method is separately excited. Due to the use of static rectification devices, it is also called separately excited static excitation. An AC pilot exciter provides the excitation current. The AC pilot exciter can be a permanent magnet measuring device or an AC generator with a self-excited constant voltage device. To improve the excitation regulation speed, the AC exciter typically uses a medium-frequency generator of 100–200HZ, while the AC pilot exciter uses a medium-frequency generator of 400–500HZ. The DC field winding and three-phase AC winding of this generator are both wound in the stator slots. The rotor has only teeth and slots without windings, resembling a gear. Therefore, it has no rotating contact parts such as brushes or slip rings, offering advantages like reliable operation, simple structure, and convenient manufacturing processes. The disadvantages are higher noise and larger harmonic components in the AC electromotive force. 3, excitation method without an exciter. In this excitation method, no dedicated exciter is installed. Instead, the excitation power is obtained from the generator itself, rectified, and then supplied to the generator's own field winding, known as self-excited static excitation. Self-excited static excitation can be divided into self-shunt excitation and self-compound excitation. The self-shunt excitation method obtains excitation current through a rectifier transformer connected to the generator outlet, which is then rectified to supply the generator excitation. This method has advantages such as simple structure, fewer devices, cost savings, and less maintenance workload. The self-compound excitation method, in addition to having a rectifier transformer, also has a high-power current transformer connected in series in the generator stator circuit. The function of this transformer is to provide a larger excitation current to the generator during a short circuit to compensate for the insufficient output of the rectifier transformer. This excitation method has two excitation power sources: a voltage source obtained through the rectifier transformer and a current source obtained through the series transformer.

KSB motor control method

Motor constant V/f control method: The constant voltage-to-frequency ratio control method for permanent magnet synchronous motors is similar to that for AC induction motors. It controls the amplitude and frequency of the motor input voltage to change simultaneously, thereby keeping the motor flux constant. The constant V/f control method can meet the requirements of wide-range speed regulation systems. Even without feedback of physical signals such as current, voltage, or position, it can still achieve a certain control accuracy, which is the greatest advantage of the constant V/f control method. The constant V/f control method features simple control algorithms and low hardware costs, and has been widely used in the field of general-purpose inverters. The disadvantages of the constant V/f control method are also obvious. Since there is no feedback of speed, position, or any other signals during the control process, it is almost impossible to obtain information on the motor's operating status, let alone precisely control speed or electromagnetic torque. The system performance is average, and the dynamic response is poor. Especially when the target speed changes or the load changes suddenly, problems such as step-out and oscillation are prone to occur. Obviously, this control method cannot separately control torque and excitation current, and large excitation currents often exist during the control process, affecting motor efficiency. Therefore, this control method is commonly used in general-purpose inverters with lower performance requirements, such as air conditioners, conveyor belt drive control in assembly lines, and energy-saving operation of water pumps and fans.

KSB motor maintenance

Preparation and inspection before motor start-up: Check whether the grounding of the electric and starting equipment is reliable and complete, and whether the wiring is correct and in good condition. Check whether the voltage and frequency indicated on the motor nameplate match the power supply voltage and frequency. For newly installed or long-idle motors, check the phase-to-phase and phase-to-ground insulation resistance of the windings before start-up. The insulation resistance should be greater than 0.5 MΩ; if it is below this value, the windings must be dried. For wound-rotor motors, check whether the brush gear on the collector rings operates properly and whether the brush pressure meets requirements. Check whether the motor rotates freely and whether the oil level in the sliding bearings reaches the specified level. Check whether the rated current of the fuses used for the motor meets requirements. Check whether all fastening bolts and mounting bolts of the motor are tightened. After all the above inspections meet the requirements, the motor can be started. After the motor starts, run it no-load for about 30 minutes, and carefully observe whether there are any abnormalities. If abnormal conditions such as noise, vibration, or overheating are found, take measures to eliminate them before putting the motor into operation. When starting a wound-rotor motor, connect the starting rheostat to the rotor circuit. For motors with a brush-lifting mechanism, lower the brushes, open the short-circuiting device, close the stator circuit switch, and adjust the rheostat. When the motor approaches its rated speed, lift the brushes, close the short-circuiting device, and the motor start-up is complete.

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