EMK-Drives motors Germany EMK-Drives models EMK-Drives prices

EMK-Drives motors refer to motors that can operate on both DC and AC power supplies. These motors are widely used in daily household appliances, manual devices, computing tools, and precision machinery. In addition, they are frequently used in medical equipment, communication technology, measurement technology, the film industry, and many other fields.

EMK-Drives motor precautions

Protection against oil and water for motors, A: Servo motors can be used in locations exposed to water or oil droplets, but they are not fully waterproof or oil-proof. Therefore, servo motors should not be placed or used in environments submerged in water or oil. B: If the servo motor is connected to a gearbox, an oil seal should be added when using the servo motor to prevent oil from the gearbox from entering the servo motor. C: Do not immerse servo motor cables in oil or water. Two, Servo motor cables → Stress relief. A: Ensure that the cable is not subjected to torque or vertical load due to external bending forces or its own weight, especially at the cable outlet or connection point. B: When the servo motor is moving, the cable (the one configured with the motor) should be firmly fixed to a stationary part (relative to the motor), and it should be extended using an additional cable installed in a cable support to minimize bending stress. C: Make the bend radius of the cable as large as possible. Three, Allowed shaft end load for servo motors. A: Ensure that the radial and axial loads applied to the servo motor shaft during installation and operation are controlled within the specified values for each model. B: Exercise extreme caution when installing a rigid coupling, as excessive bending load may cause damage or wear to the shaft end and bearings. C: It is recommended to use flexible couplings to keep the radial load below the allowable value; these are specifically designed for servo motors with high mechanical strength. D: For allowed shaft loads, please refer to the "Allowed Shaft Load Table" (user manual). Four, Servo motor installation precautions, A: When installing/removing coupling components to/from the servo motor shaft end, do not strike the shaft end directly with a hammer. (Striking the shaft end directly with a hammer will damage the encoder at the other end of the servo motor shaft.) B: Strive to align the shaft end to the optimal state (misalignment may cause vibration or bearing damage).

EMK-Drives motor maintenance

Preparation and inspection before motor startup: Check whether the grounding of the electric motor 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 insulation resistance between phases and from phase to ground of the windings before startup. The insulation resistance should be greater than 0.5 MΩ; if it is lower than this value, the windings must be dried. For wound-rotor motors, check whether the brush device on the collector ring works properly and whether the brush pressure meets the requirements. Check whether the motor rotates flexibly and whether the oil in the sliding bearings has reached the specified level. Check whether the rated current of the fuses used for the motor meets the 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 under no-load for about 30 minutes, observing carefully for 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, disconnect the short-circuit device, close the stator circuit switch, and operate the rheostat. When the motor approaches the rated speed, lift the brushes, close the short-circuit device, and the motor startup is complete.

EMK-Drives motor troubleshooting methods

When the no-load current of the motor exceeds the limit data, it indicates that the motor has failed. Reasons for high no-load current include high internal mechanical friction, partial short circuits in the coils, and demagnetization of the magnetic steel. We continue with relevant tests and inspection items to further determine the cause or location of the fault. When the no-load/load speed ratio of the motor is greater than 1.5, turn on the power and rotate the throttle to make the motor run at high speed under no-load for more than 10s. After the motor speed stabilizes, measure the maximum no-load speed N1 of the motor at this time. Under standard test conditions, travel a distance of more than 200m and begin to measure the maximum load speed N2 of the motor. No-load/load speed ratio = N2 ÷ N1. When the no-load/load speed ratio of the motor is greater than 1.5, it indicates that the demagnetization of the motor's magnetic steel is quite severe, and the entire set of magnetic steel inside the motor should be replaced; in actual electric vehicle maintenance, it is common to replace the entire motor. The direct cause of motor heating is high current. The relationship between motor current I, motor input electromotive force E1, induced electromotive force during motor rotation (also called back EMF) E2, and motor coil resistance R is: I = (E1-E2) ÷ R. An increase in I indicates that R has decreased or E2 has reduced. A decrease in R is generally caused by short circuits or open circuits in the coils, while a reduction in E2 is generally caused by demagnetization of the magnetic steel or short circuits/open circuits in the coils. In the practice of whole-vehicle maintenance for electric vehicles, the method for handling motor heating faults is generally to replace the motor. Whether high-speed or low-speed motors, mechanical collisions or discontinuous irregular mechanical noise should not occur during load operation. Different types of motors can be repaired using different methods. The reasons for short driving range and weak motor power (commonly known as lack of power) are complex. However, after excluding the above 4 types of motor faults, generally speaking, the fault of short driving range is not caused by the motor, but is related to battery capacity attenuation, the charger not fully charging the battery, controller parameter drift (PWM signal not reaching 100%), etc. Phase loss in brushless motors is generally caused by damage to the Hall elements of the brushless motor. We can determine which Hall element has failed by measuring the resistance of the Hall element output leads relative to the Hall ground wire and the Hall power supply lead, using a comparison method. To ensure the accuracy of the motor commutation position, it is generally recommended to replace all three Hall elements simultaneously. Before replacing the Hall elements, it is necessary to clarify whether the phase electrical angle of the motor is 120° or 60°. Generally, for 60° phase angle motors, the three Hall elements are arranged in parallel. For 120° phase angle motors, the middle Hall element among the three is placed in a flipped 180° position.

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