If the three power cables of the servo motor (SM) are not connected correctly, there may be no alarm in the static state. However, as soon as the motor is manually or actively operated, the motor will jump or start to flutter, such as when the speed is added too high, and the system will issue an alarm such as a summary error.
When testing the motor, do not place it on a table. It is safer to keep on the ground. When starting the machine, do not set the speed too high. If it's too low, the motor will be a sensation. In this way, we will know that the motor wire is connected incorrectly. The test changes the phase.
In some potentiometer-regulated drives, this problem can also occur if the parameters are wrong. The parameters can only be corrected by adjusting the potentiometer parameters.
When the motor is stationary, pull the motor shaft in a safe way. In general, the hand will feel the static torque of the motor; If the phase sequence of the motor is reversed, you can pull the motor shaft and then disassemble it without having to exert too much force. The system alarms, and the motor loses torque.
What happens if the SM wiring is not in the right phase?
It will rotate, and the time division motor will rotate when the phase sequence is wrong, and the encoder will react, which is different from the set direction.
The stator structure of the communication SM is basically similar to that of the capacitive split-phase single-phase asynchronous motor. The stator is equipped with two windings with a difference of 90°, one is the excitation winding Rf, which is always connected to the communication voltage Uf; The other is the control winding L, which is connected to the control signal voltage Uc.
When the communication SM does not have a control voltage, the rotor is stationary as long as the pulsating magnetic field in the excitation winding is present in the stator. When there is a control voltage, a rotating magnetic field occurs in the stator, and the rotor rotates in the direction of the rotating magnetic field. When the load is constant, the speed of the motor varies with the operating voltage. When the phase of the control voltage is reversed, the SM will rotate.
Due to the large rotor resistance, the torque characteristic curve is significantly different from that of general asynchronous motors. It is possible to make the critical slip rate S0 " 1, which not only brings the torque characteristics (mechanical characteristics) closer to linearity, but also has a larger starting torque. Therefore, when the stator has a controlling voltage, the rotor rotates immediately, which is characterized by fast start and high sensitivity.
CommunicationSM runs smoothly and has low noise. However, the handling characteristics are non-linear, and due to the large rotor resistance, large loss, and low power, compared with DCSM of the same capacity, it is only suitable for low-power control systems of 0.5-100W W
Theoretically, any two wrong points will be reversed. However, due to the existence of SM's reaction encoder, when the phase sequence is wrong, the motor rotates, and the encoder reacts, which does not conform to the set orientation, so it accelerates, so it flies. At this time, the driver will immediately issue an overcurrent alarm.
Therefore, in general, the three phases of UVW are unique and cannot be misconnected. The end result of fault bridging is that the driver reports an error.
|
More on that
|
The difference between vector and general use of frequency converter
1. The control accuracy of the vector type is higher than that of the general type.
2. The vector type has a large output torque at low speed, which can make the motor get a larger starting torque, and is suitable for use in the occasion of heavy load starting, such as: high-power long belt, hoist, etc. If it is used in some of the more common fields ...
|
|
The inverter is regularly replaced with the device - Sunland inverter
1. Cooling fan
As a prerequisite for ensuring the normal operation of the inverter, efficient and fast in-line cooling fans have become an indispensable conversion configuration of the inverter. Because of the wear of the internal bearings of the cooling fan and the reduction of the grease function in the process of application, the cooling of the fan.
|
|
Motor inverter principle and precautions for use - Senlan
The difference between a voltage converter and a current converter
Voltage inverter and current inverter are two different operating principles, for example, the operating principle of voltage inverter is mainly to regulate the voltage source, and the voltage source regulates the current to achieve the effect of conditioning, while the current inverter is a direct ...
|
|
Quickly determine whether the inverter used is suitable - Sunland inverter
First of all, we need to understand a truth, that is, many times the good and bad of things are relative. The variable frequency drive (VFD) is used as a power source to drive the operation of the motor, and its fundamental role is to regulate the speed. If the wiring is normal, the parameters are reasonable, and the load is not ...
|
|
About the basic selection of Hope Sunland inverter
It is hoped that Sunland low-voltage inverter can be divided into four series:
1.HG1000 high-performance light-load intelligent inverter, the most cost-effective, the new series is widely used in medicine, food, packaging, cable, printing and dyeing, washing, centrifuge ...
|
|
Hope Sunland inverter introduction and common models
It is hoped that Sunland inverter is mainly used in three-phase asynchronous AC motor to control and adjust the motor speed. Sunland inverter is mainly composed of microprocessor, including rectification, filtering, inverter, brake, drive, detection, etc. In order to achieve the purpose of changing the power supply voltage, according to the actual needs of the motor...
|
|
Precautions for inverter selection and capacity matching - Senlan
1. Select the inverter according to the load characteristics
Second, when selecting the inverter, the current value of the practical motor should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. Secondly, it should be fully considered that the output of the inverter contains higher harmonics, which will form the power factor of the motor.
|
|
Hope Sunland grid-connected PV inverter
Grid-connected photovoltaic inverter is one of the core components of solar photovoltaic power generation system, the main types are: central inverter, modular inverter, micro inverter, DC ...
|
|
Calculation method of braking resistance and power of inverter - Sunland inverter
(1) Brake usage rate ED%
Brake usage rate ED%, that is, the brake usage rate in the clarification book ED%. The brake utilization rate ED% is said to be the deceleration time T1 divided by the deceleration cycle T2, and the brake utilization rate is mainly to allow the braking unit and the brake resistance to have sufficient time to dissipate ...
|
|
Automatic gain adjustment part - Sunland inverter
In fact, there are also options for automatic gain adjustment, which generally divide the control response into several levels, such as high echo, medium echo, and low echo, which can be set by the user according to actual needs.
Azimuth Share Buff:
1. Set the share gain of the azimuth ring adjuster;
2 ...
|
|
The reason why the inverter damaged the motor - Senlan
The presentation of inverters has brought a revolution to industrial automation control and motor energy saving. Industrial production is simply inseparable from the inverter, even in the daily livelihood, elevators, inverter air conditioning has become a part of the insistence, inverter from the beginning into all corners of production, subsistence. However...
|
|
Advantages of choosing a frequency converter
Advantage 1: Energy saving
The motor adopts frequency converter speed regulation, and its power can be improved by 5%-10%.
The inverter accounts for 20%-30% of the total capacity of the communication motor in the drag of load equipment such as fans, pumps, extruders, mixers, etc., which has a significant energy-saving effect, because the consumption of the fan and water pump is significant.
|
|
Sunland's measures to reduce inverter failure
According to the test, the service life of the inverter is halved for every 10°C increase in the operating ambient temperature. For this reason, in daily use, a reasonable maintenance cycle and guidelines should be formulated according to the actual operating environment and load characteristics of the inverter.
|
|
Inverter control motor speed method - Senlan
1. Why can the rotation speed of the motor be changed freely?
The unit of motor rotation speed: r/min the number of rotations per minute, can also be expressed as rpm.
Example: 2-pole motor 50Hz3000 [r/min]
4-pole motor 50Hz1500[r/min]
Conclusion: The rotation of the motor ...
|
|
The method of selecting the appropriate peripheral equipment for the inverter - Senland
When we have selected a suitable Variable-frequency Drive (VFD), we also need to consider whether we need to equip other peripheral equipment according to the actual situation of the site. The peripheral equipment selected by VFD mainly includes circuit breakers, reactors, contactors, braking resistors, etc.
...
|
|
The comprehensive application of Sunland's high-power boiler feed pump has added another classic
Recently, the "General Contracting Project of Boiler Feed Pump Frequency Conversion Technology Transformation Project of Yili Power Plant of Guoshen Group" undertaken by Hope Sunland has been successfully implemented and connected to the grid, adding another classic to the comprehensive application of Sunland's high-power boiler feed pump.
In 2020 ...
|
|
The choice of inverter braking resistor - hope Senlan
In addition to the limitation of the maximum promised current of the special energy consumption braking unit of the inverter, the selection of the braking resistor has no clear correspondence with the braking unit, and its resistance value is mainly selected according to the size of the required braking torque.
Power...
|
|
Selection and capacity matching of inverter - Senlan
1. Select the inverter according to the load characteristics
Second, when selecting the inverter, the actual motor current value should be used as the basis for the selection of the inverter, and the extra power of the motor can only be used as a reference. Secondly, it should be fully considered that the output of the inverter contains higher harmonics, which will form the power factor of the motor.
|
|
Motor encoder and rotor pole phase zero alignment repair - Sunland
1. Phase alignment method of incremental encoder
The alignment between the phase of the UVW electronic transmutation signal and the phase of the rotor pole, or the phase of the TV spot, of the incremental encoder with the signal exchange is as follows:
1) Use a DC power supply to pass the UV winding of the motor to less than the amount of ...
|
|
The cause of vibration and noise in the inverter - Sunland inverter
Generally speaking, the inverter will inevitably present some problems during operation, such as oscillation and noise, which are common problems in VFD operations. So, what causes oscillation and noise in VFDs? What is the solution to these problems? Here are the causes of VFD oscillation and noise ...
|
|
Contact
working hours
