Precautions for using moons servo motor
As a high-precision, high-response drive component, the performance and service life of moons servo motor depend on standardized selection, installation, operation and maintenance, specific precautions are as follows.
First, selection and parameter matching
Load characteristic adaptation: according to the type of load (constant torque, constant power or variable load) to choose the type of motor, for example, handling robot joints need constant torque servo motors, while the high-speed spindle drive needs constant power motors. At the same time, the ratio of load inertia to motor rotor inertia should be accounted for (it is recommended to be controlled within 5:1), as the ratio is too large, resulting in response hysteresis and triggering vibration or overshoot.
Matching power and torque: Select the rated torque of the motor according to the peak torque of the actual working load (including acceleration and shock load), and reserve a margin of 20%-30% to avoid overloading for a long period of time, leading to demagnetization of the magnets or overheating of the windings. For example, to drive a linear module with 100kg load, it is necessary to calculate the dynamic torque during the acceleration phase instead of only referring to the static load.
Accuracy level matching: Select the encoder resolution according to the positioning accuracy requirement, 17-bit encoder (131072 pulses/turn) is sufficient for common handling scenarios, while 23-bit or above absolute encoder is required for precision assemblies (e.g. semiconductor packages), so as to avoid affecting the positioning accuracy due to insufficient resolution.
Installation and Wiring Specifications
Mechanical Installation Requirements:
The coaxiality error between the motor output shaft and the load shaft should be ≤0.1mm, and the parallelism error should be ≤0.05mm/m, otherwise it will generate additional radial force and aggravate the wear of bearings. The coupling is preferred to the elastic coupling to cushion the impact caused by the installation deviation. When installing vertically, it is necessary to install the shaft end support to prevent the motor shaft from bending due to self-weight; if the motor is connected with the reducer, it is necessary to ensure that the input shaft of the reducer and the motor shaft are rigidly aligned to avoid axial force being transferred to the motor bearings.
Electrical wiring specification:
Power line and signal line should be wired separately (spacing ≥ 30cm), to avoid high-frequency interference in the power line affecting the encoder signals, signal line is recommended to use shielded wires and single-ended grounding (grounding resistance ≤ 4Ω).
Before wiring, make sure that the power supply voltage is the same as the rated voltage of the motor (e.g. AC220V/380V), misconnecting the high voltage will directly burn the winding; the encoder wiring should be corresponded to the definition of the pin, and reversing the wiring may lead to counting errors or damage to the encoder.
Third, the operating environment control
Temperature and humidity management: motor working environment temperature should be controlled at - 10 ℃ to 40 ℃ (some high-temperature models up to 85 ℃), the temperature is too high will lead to the magnetic steel magnetic attenuation, insulation aging; Relative humidity ≤ 80%, humid environments need to be done on the motor shell to prevent rust (such as spraying waterproof paint), and to ensure that the junction box is well sealed.
Dust and corrosive protection:
Dusty environment (such as machining workshop) need to use IP65 and above the protection level of the motor, regularly clean up the dust of the cooling hole, to prevent blockage leading to poor heat dissipation.
Corrosive environments (such as chemical, food processing) need to use stainless steel shell motor, encoder interface sealing connector, to avoid corrosive gas intrusion into the internal.
Vibration and shock control: the installation foundation should be stable, to avoid the motor in a long-term vibration environment (vibration acceleration ≤ 5g), otherwise it will lead to encoder component loosening, bearing clearance increased. If it is used in shock scenes such as stamping equipment, it is necessary to install vibration-damping pads between the motor and the frame.
Operation and Parameter Setting
Check before starting:
Manually rotate the motor shaft to confirm that there is no stagnation or abnormal noise; check whether the cooling system (such as fan, water-cooling device) is working properly to ensure that the heat dissipation is smooth.
Before the first power on the servo drive debugging software to detect the motor phase, to avoid reversal or flying motor due to the wrong phase sequence.
Parameter debugging specification:
Adjust the PID parameters according to the load characteristics, rigid loads (such as machine tool table) need to increase the proportional gain, flexible loads (such as robotic arm) need to reduce the integration time to avoid resonance. The parameters can be optimized initially through the self-tuning function of the driver, and then fine-tuned manually.
Limit the maximum speed and acceleration to prevent the motor from overspeed (exceeding the rated speed by 1.2 times may lead to dynamic balance failure) or rapid acceleration to generate excessive inrush current.
Monitoring during operation: Observe the current, temperature, speed and other parameters displayed by the drive in real time, if there are alarms of over-current, over-voltage and overheating, it should be shut down immediately for inspection, to exclude the problems of load stagnation, poor heat dissipation or wrong parameter setting, and it should not be forcibly reset to operation.
Five, maintenance and repair
Regular inspection:
Every 1000 hours of operation to check whether the motor connecting wire is loose, whether the encoder plug is in good contact; measure the insulation resistance (≥ 50MΩ between the winding and the shell), to prevent the insulation from deterioration leading to power leakage.
Check the status of bearings, if there is abnormal noise or axial runout increases (more than 0.03mm), it is necessary to replace the bearings in time (it is recommended to use the same type of high-precision bearings, such as P5 level).
Cleaning and lubrication:
Clean the dust and oil on the surface of the motor, and keep the heat sink smooth; if it is a servo motor with carbon brushes (a few special models), it is necessary to check the wear of carbon brushes every 500 hours, and replace them in time when the remaining length is less than 1/3, so as to avoid the wear of commutator.
It is forbidden to dismantle the motor by yourself, especially the permanent magnet synchronous motor, the dismantling may cause the magnet steel to be demagnetized or enter into the iron chips, which will affect the performance.
Storage requirements: long-term idling (more than 3 months) need to be placed in a dry and ventilated environment (relative humidity ≤ 60%), the shaft end of the anti-rust oil, regular (every 3 months) manually rotate the motor 1-2 laps, to prevent the bearing grease solidification.
Sixth, safety protection
Electrical safety: the motor shell must be reliably grounded to avoid electric shock caused by leakage; drive and the power line between the motor to be installed overload protector to prevent short-circuit accidents expand.
Mechanical protection: rotating parts need to be equipped with protective cover, especially the exposed motor shaft and coupling, to prevent the involvement of clothing or foreign objects; in the vertical shaft drive scenario (such as lifts), need to be coupled with a braking device, to prevent the load from falling when the power is off.
Contact Us
📞 Phone: +86-8613116375959
📧 E-mail: 741097243@qq.com
🌐 Official website: https://www.automation-js.com/
