Rose+Krieger motor Germany Rose+Krieger model Rose+Krieger price

Rose+Krieger motors adjust speed by changing the number of magnetic pole pairs, voltage, current, frequency, and other parameters to achieve higher performance. Due to their excellent performance, adjustable-speed motors are widely used in industries such as steel, power plants, cables, chemicals, petroleum, cement, textiles, printing and dyeing, papermaking, and machinery for stepless speed control of loads with constant torque or decreasing torque. They are particularly suitable for driving pumps and fans with significant flow variations, achieving good energy-saving results.

Rose+Krieger motor mechanical characteristics

Due to their low starting current and high starting torque, these motors are often used in applications with difficult starting conditions or where high starting torque is required for intermittent operation, such as in control switches. This allows for high starting torque and a much smaller form factor compared to other motor types. Additionally, universal motors have a wide speed control range and can achieve high speeds. The speed of general asynchronous motors depends on the number of poles and supply frequency; the maximum speed of a two-pole motor powered by 50Hz is below 3ooor/min. Of course, variable-frequency motors can increase speed but require a dedicated power supply. Speed can be increased by reducing the number of armature conductors; for example, universal motors in power tools reach 9900 to 145oor/min, and high-speed centrifuges in medical devices can reach up to 20000r/min. Therefore, these motors are suitable for high-speed applications, such as dental drills driven by universal motors. Universal motors have relatively soft mechanical characteristics; speed drops rapidly as torque increases, limiting output power increase and preventing overload due to increased load. This makes them suitable for constant power control or applications with large fluctuations in load torque. In tape tension mechanisms of tape recorders and bicycle drive systems, these motors can replace permanent magnet DC motors. When the load is very small, the speed of a universal motor becomes very high, so it cannot operate at full voltage with no load. Generally, when operating at full voltage, the minimum load should not be less than 25% to 30% of the rated value. When the load is very small, the speed of a universal motor becomes very high, so it cannot operate at full voltage with no load. Generally, when operating at full voltage, the minimum load should not be less than 25% to 30% of the rated value.

Rose+Krieger motor braking methods

Regarding motor braking, users often confuse electromagnetic braking, regenerative braking, and dynamic braking, leading to incorrect component selection. Dynamic brakes consist of dynamic braking resistors and shorten the mechanical feed distance of servo motors through energy consumption braking during faults, emergency stops, or power failures. Regenerative braking feeds the energy generated during deceleration or stopping back to the DC bus via the inverter circuit, where it is absorbed by the RC circuit. Electromagnetic braking locks the motor shaft using a mechanical device. Differences: (1) Regenerative braking only works when the servo amplifier is functioning normally and cannot brake the motor during faults, emergency stops, or power failures. Dynamic brakes and electromagnetic brakes do not require power to operate. (2) Regenerative braking operates automatically by the system, while dynamic brakes and electromagnetic brakes require external relay control. (3) Electromagnetic brakes are generally activated after SV or OFF; otherwise, amplifier overload may occur. Dynamic brakes are generally activated after SV, OFF, or main circuit power-off; otherwise, the dynamic braking resistor may overheat.

Rose+Krieger motor working principle

When symmetrical three-phase AC current is supplied to the three-phase stator windings of the motor, a rotating magnetic field is generated that rotates clockwise in the space between the stator and rotor inner circles at synchronous speed n1. Since the rotating magnetic field rotates at n1 speed and the rotor conductors are initially stationary, the rotor conductors cut the stator's rotating magnetic field, generating an induced electromotive force (direction determined by the right-hand rule). As the ends of the rotor conductors are short-circuited by end rings, an induced current largely consistent in direction with the induced electromotive force is generated in the rotor conductors. The current-carrying rotor conductors are subjected to electromagnetic force in the stator magnetic field (direction determined by the left-hand rule). This electromagnetic force produces electromagnetic torque on the rotor shaft, driving the rotor to rotate in the direction of the rotating magnetic field. From this analysis, the motor working principle can be summarized as follows: When three-phase symmetrical AC current is supplied to the three-phase stator windings (each phase differing by 120 electrical degrees), a rotating magnetic field is generated. This field cuts the rotor windings, inducing current in the closed-loop rotor windings. The current-carrying rotor conductors generate electromagnetic force under the action of the stator's rotating magnetic field, forming electromagnetic torque on the motor shaft, which drives the motor to rotate in the same direction as the rotating magnetic field.

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