KREMP motor Germany KREMP model KREMP price

KREMP motors refer to electric motors with a rated voltage above 1000V. Commonly used voltages are 6000V and 10000V; due to differences in foreign power grids, there are also voltage levels of 3300V and 6600V. High-voltage motors were developed because motor power is proportional to the product of voltage and current. Therefore, when the power of low-voltage motors increases to a certain extent (such as 300KW/380V), the current is limited by the allowable carrying capacity of the wires, making it difficult to increase further or resulting in excessive costs. It is necessary to increase the voltage to achieve high-power output. The advantages of high-voltage motors are high power and strong shock resistance; the disadvantages are high inertia, making starting and braking difficult.

KREMP motor maintenance

Motor maintenance: 1. Before use, confirm whether the appearance of the low-speed motor is damaged and whether there is any oil leakage. 2. Please first confirm whether the purchased low-speed motor specifications match the design. 3. If using accessories such as sprockets, pulleys, or couplings, install them according to relevant standards. 4. Lubricating grease is already installed inside the low-speed motor housing, requiring no lubricant replacement for 16000 hours. 5. During the operation of the low-speed motor transmission, ensure that the current does not exceed the value indicated on the motor nameplate. 6. Please pay attention to ambient temperature, humidity, acidity, and alkalinity. 7. The suitable environment is -5℃ to 40℃, with humidity below 85%, and indoor altitude below 1000 meters. 8. Incorrect installation, maintenance, or operation may cause serious damage to the low-speed motor. 9. When repairing or disassembling, strictly confirm that the external power supply to the motor is completely disconnected. 10. Safety protection devices must be properly installed to ensure absolute operational safety. 11. The motor must be grounded; please refer to relevant electrical distribution regulations. 12. Confirm that the motor is installed correctly before starting the low-speed motor. 13. If the low-speed motor is used with an inverter for low-speed transmission, an independent auxiliary cooling fan must be installed. 14. After a single-phase low-speed motor is powered off, residual charge remains in its capacitor; please discharge it first or ground the terminals. 15. For vertical motor installation, please specify this in advance when ordering or contact our company.

KREMP motor speed control

The motor consists of three parts: a squirrel-cage motor, an electromagnetic slip clutch, and a DC excitation power supply (controller). The DC excitation power supply has low power and is usually composed of a single-phase half-wave or full-wave thyristor rectifier. Changing the conduction angle of the thyristor can change the magnitude of the excitation current. The electromagnetic slip clutch consists of three parts: an armature, magnetic poles, and an excitation winding. There is no mechanical connection between the armature and the latter, allowing both to rotate freely. The armature is coaxially connected to the motor rotor, known as the driving part, driven by the motor; the magnetic poles are coupled to the load shaft via a coupling, known as the driven part. When both the armature and magnetic poles are stationary, if DC current is applied to the excitation winding, several pairs of N and S alternating polarity magnetic poles will form along the air gap circumference, with magnetic flux passing through the armature. When the armature rotates with the driving motor, relative motion between the armature and magnetic poles induces eddy currents in the armature. These eddy currents interact with the magnetic flux to produce torque, driving the rotor with magnetic poles to rotate in the same direction, but its speed is always lower than the armature speed N1. This is a slip speed control method. By varying the DC excitation current of the slip clutch, the output torque and speed of the clutch can be changed. A hydraulic coupling is a hydraulic transmission device, generally composed of a pump wheel and a turbine, collectively referred to as working wheels, housed in a sealed casing. A certain amount of working fluid is filled into the casing. When the pump wheel rotates driven by the prime mover, the fluid inside is pushed by the blades to rotate. Under the action of centrifugal force, as it enters the turbine along the outer ring of the pump wheel, it exerts thrust on the turbine blades in the same rotational direction, driving the production machinery. The power transmission capacity of the hydraulic coupling is consistent with the relative amount of fluid filling in the casing. During operation, changing the fill rate can change the turbine speed of the coupling, achieving stepless speed regulation.

KREMP motor control principle

The motor control principle requires that to start the motor, the control unit must first determine the position of the motor rotor based on signals sensed by the hall-sensor. Then, depending on the stator winding configuration, it determines the sequence for turning on (or off) the power transistors in the inverter (inverter): AH, BH, CH (known as upper-arm power transistors) and AL, BL, CL (known as lower-arm power transistors). This causes current to flow sequentially through the motor coils, generating a forward (or reverse) rotating magnetic field that interacts with the rotor magnets, thereby enabling clockwise or counter-clockwise rotation. When the motor rotor rotates to a position where the hall-sensor senses another set of signals, the control unit activates the next group of power transistors. This cycle allows the motor to continue rotating in the same direction until the control unit decides to stop the rotor by turning off the power transistors (or only turning on the lower-arm power transistors). To reverse the rotor, the activation sequence of the power transistors is reversed. Basically, the switching sequence of power transistors can be exemplified as follows: AH and BL as a pair → AH and CL as a pair → BH and CL as a pair → BH and AL as a pair → CH and AL as a pair → CH and BL as a pair. However, AH and AL, or BH and BL, or CH and CL must never be turned on simultaneously. Furthermore, since electronic components have switching response times, these must be considered during the transition between turning off and on. Otherwise, if the lower arm (or upper arm) turns on before the upper arm (or lower arm) has completely turned off, it will result in a short circuit between the upper and lower arms, burning out the power transistors.

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