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Electramo motors have a set of adjustable eccentric weights installed at each end of the rotor shaft, utilizing the centrifugal force generated by the high-speed rotation of the shaft and eccentric weights to obtain excitation force. Vibration motors have a wide vibration frequency range; only when the excitation force and power are properly matched can mechanical noise be reduced. Vibration motors are classified into six categories, such as by starting and operating mode, and by operating speed.

Common Electramo motor problems

Motor problems: 1. After the speed-regulated motor accelerates, the speed gradually decreases until it stops. In this case, observe the changes in the ammeter pointer in the speed-regulated motor's electrical cabinet. If the indicated current increases sharply, overload protection devices such as the main motor's thermal relay will inevitably trip, causing the main motor to disconnect from the three-phase power supply and stop running. At this time, carefully check whether the wiring connections of relevant components in the main motor circuit and the AC contactor of the main motor, as well as all overload protection devices such as thermal relays in the speed-regulated motor's electrical cabinet, are loose or have poor contact causing heating. If there are issues in these areas, the current will increase rapidly due to poor contact between wires and components in the circuit after the main motor accelerates, causing protective shutdown. When the speed-regulated motor runs at low speed, the main motor's working current is small, so the speed will not gradually decrease to a stop. However, when the speed-regulated motor accelerates, the electrical load is high, and faults in electrical components become apparent. In actual work, it is sometimes observed that terminal blocks in the speed-regulated motor's electrical cabinet heat up due to poor wire contact, even forming an oxide layer at the connection points, and the wire insulation burns and discolors. These issues seriously affect the normal operation of the main drive motor. Operators must immediately take corresponding measures, such as cleaning the contact surfaces of terminal blocks and wires, tightening wiring screws, removing burnt oxide layers from wires, and replacing severely damaged terminal blocks. 2. The main drive motor produces significant noise during operation. To adjust the dynamic balance of the slip motor, balancing weights are installed at both ends of its armature and magnetic pole rotor. If these devices are slightly loose, the slip motor will deviate from its original position during high-speed rotation. If the fault occurs on the outer surface of the main drive motor, it will cause local friction between the armature and the magnetic pole rotor, increasing noise. At this time, stop the machine for repair, restore the dynamic balance of the armature and magnetic pole rotor, re-locate and secure the original dynamic balancing weights to ensure normal operation of the main drive motor.

Electramo 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. The armature and the latter have no mechanical connection and can rotate freely. The armature is coaxially connected to the motor rotor, called the driving part, driven by the motor; the magnetic poles are coupled to the load shaft via a coupling, called the driven part. When both the armature and magnetic poles are stationary, if DC current is applied to the excitation winding, several pairs of alternating N and S 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; changing the DC excitation current of the slip clutch changes the output torque and speed of the clutch. A hydraulic coupling is a hydraulic transmission device, generally composed of a pump wheel and a turbine, collectively called working wheels, placed in a sealed housing. The housing is filled with a certain amount of working fluid. When the pump wheel rotates under the drive of the prime mover, the fluid inside is pushed by the blades to rotate. Under the action of centrifugal force, it enters the turbine along the outer ring of the pump wheel, giving thrust to the turbine blades in the same rotational direction, thereby driving the production machinery. The power transmission capacity of the hydraulic coupling is consistent with the relative amount of fluid filling in the housing. During operation, changing the fill rate can change the turbine speed of the coupling, achieving stepless speed regulation.

Electramo motor precautions

Motor precautions: 1. Before disassembly, use compressed air to blow off dust from the motor surface and wipe away surface dirt. 2. Select a location for motor disassembly and clean the site environment. 3. Familiarize yourself with the motor's structural features and maintenance technical requirements. 4. Prepare the tools (including special tools) and equipment required for disassembly. 5. To further understand defects during motor operation, perform an inspection test before disassembly if conditions permit. For this, run the motor with load, carefully check the temperature, sound, vibration, and other conditions of each part of the motor, and test voltage, current, speed, etc. Then disconnect the load and perform a no-load inspection test separately, measuring no-load current and no-load loss, and keep records. 6. Cut off the power supply, remove external motor wiring, and keep records. 7. Use a megohmmeter with appropriate voltage to test the motor's insulation resistance. To compare with the insulation resistance value measured during the previous maintenance to judge the trend of motor insulation changes and insulation status, convert the insulation resistance values measured at different temperatures to the same temperature, generally converted to 75℃. 8. Test the absorption ratio K. When the absorption ratio is greater than 1.33, it indicates that the motor insulation has not been dampened or the dampness is not severe. To compare with previous data, also convert the absorption ratio measured at any temperature to the same temperature.

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