1. Mechanical speed regulation form
There are three methods of mechanical speed regulation: electromagnetic clutch, hydraulic coupling, and viscous clutch. Among them, the hydraulic coupling device is widely used, that is, a hydraulic coupling device is connected in series between the motor and the load, and the coupling force between the motor and the load is adjusted through the concave and convex liquid level to complete the speed regulation of the load.
2. Cascade speed regulation form.
The winding asynchronous motor must be used in the transmission, and part of the energy of the rotor winding is sent back to the grid through the rectifier and inverter, which is equivalent to adjusting the internal resistance of the rotor and then changing the slip rate of the motor. Because the voltage of the rotor is generally not equal to the voltage of the grid, a transformer is required to reverse it to the grid.
In order to save this transformer, the internal feed motor is widely used in the domestic market, that is, a three-phase auxiliary winding is set on the stator to receive the reaction energy of the rotor, and the auxiliary winding is also involved in the work. This will cut the amount of energy absorbed by the main windings from the grid to accomplish the speed adjustment and energy saving intentions.
However, due to the small number of winding motors used in industrial production, the scale of use of series speed adjustment is also narrow.
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Senlan low-voltage inverter has four series of applications
1.SB200 fan pump special inverter, widely used in textile, printing and dyeing, washing, cable, packaging, machinery, ceramics, constant pressure water supply, constant temperature control or various OEM.
2.HG1000 high-performance light-load intelligent inverter ...
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What is the energy feedback of the inverter - Senlan inverter
The essence of energy feedback is active inverter, and the realization method of energy feedback of general inverter is to feed renewable energy to the grid with an anti-parallel three-phase inverter at the uncontrolled rectification of the pre-stage of the general inverter. The main circuit of the energy feedback equipment is mainly composed of thyristors, IGBTs and IPM modules.
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Inverter parameter setting method - Senlan
1. Control method:
i.e. speed control, rotation control, PID control, or other methods. After the control method is adopted, it is generally necessary to carry out static or dynamic identification according to the control accuracy.
2. Minimum operating frequency:
That is, the minimum speed of the motor operation, the motor at low speed ...
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Characteristics of two-phase electric fan inverter - Sunland inverter
The digital signal processor is selected, and the work efficiency is higher
A good quality two-phase electric fan inverter uses a digital signal processor, which can make the work efficiency higher, that is, it may take 3 hours to complete the work, but now it only takes 2 hours to be able to...
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Misunderstanding of the use of inverter - Senlan inverter
Poor choice
This should be the situation that friends have encountered the most in the Z, the situation of large horse-drawn carts and small horse-drawn carts is everywhere. The big horse-drawn trolley is not bad, at least there is no big problem in use, the most investment has been added, and the equipment can still operate normally; But the small horse-drawn cart ...
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Sunland won the "well-known brand of China's domestic inverter" for the fifth time in a row
On April 15, 2011, the "Century Tour of China's Automation Industry (CAIE2011)" was held in Beijing, and Sunland inverter was once again re-elected as "China's well-known brand of domestic inverter". Dr. Chen Bin, President of Continental Hope Group and Chairman of Hope Sunland Technology Co., Ltd., personally ...
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The basic requirements of VFD installation design - Sunland inverter
(1) The VFD should be installed in the control cabinet.
(2) The VFD is best installed in the center of the control cabinet; The VFD It should be vertically installed with the top and bottom protected from large parts that may obstruct the exhaust and intake.
(3) VFD control cabinet or partition, or the upper and lower parts of the necessary device ...
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Senlan identifies the fault place of the inverter
How to distinguish where the inverter is wrong?
Step 1: Static data checking
1. Check the inverter circuit
The red watch rod is received to the P end, and the black watch rod is separated from U, V, and W, and there should be a resistance value of tens of ohms, and the resistance value base of each phase, the same, the opposite should be infinite.
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The main step of inverter debugging - Sunland inverter
Investigation of the function of the inverter system
Before debugging the frequency converter, it is necessary to carefully read the operation instructions and related information of the inverter to be debugged to understand the application environment and precautions. Especially before the inverter is energized, it is necessary to carefully observe and see if the inverter has obvious problems.
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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 ...
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Sunland inverter electromagnetic interference suppression method
When the peripheral equipment and the inverter share the same power supply, the disturbance generated by the inverter is transmitted against the power line, which will cause other equipment in the same system to malfunction. The following methods can be adopted:
(1) The input device of the inverter is equipped with an EMI filter or a ferrite common-mode filter (magnetic ring) ...
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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 ...
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Sunland low-voltage inverter division 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, dehydrator, sewage treatment, HVAC, constant pressure water supply, constant temperature control, flow control and other industries, such as fans and pumps, ...
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Hope for an application example of Sunland inverter
Industrial process control: It is expected that Sunland inverters are widely used in industrial process production control, such as conveyors, tugboats, air compressors, pumps, and fans and other equipment in various control systems.
Mechanical control: It is expected that Sunland inverters are widely used in mechanical control, such as ...
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General technical specifications for Sunland inverter SB200 series
Input rated voltage, frequency 3 phase: 380V, 50/60Hz allowable scale Voltage: 320-420V;
Voltage unbalance: <3%;
Frequency: 47 - 63 Hz Output output voltage 3 phases, 0V - input voltage, error less than 5% Output frequency scale ...
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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 ...
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Senlan wiring knowledge
1. Wiring of fire emergency lighting
Generally, the flame retardant wire is used to wear the metal pipe and the thickness of the protective layer is ≥ 30mm, in the decoration project, when the emergency lighting circuit can only be applied to the ceiling, the heat-resistant or fire-resistant wire should be selected and the fire-resistant and heat-resistant matching should be considered.
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Inverter selection according to capacity matching - Senlan
We need to ensure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct type of inverter is selected. The general principle is what nature of the load characteristics with what characteristics of the inverter.
(1) Constant torque production equipment - in the speed regulation range ...
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Measures to prevent overvoltage of inverter - Sunland inverter
Depending on the cause of overvoltage, the countermeasures adopted are different. Regarding the overvoltage phenomenon that occurs in the parking process, if there is no special requirement for the parking time or direction, then the extension inverter deceleration time or free parking method can be selected to solve it. The so-called free parking ...
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Common problems in the use of inverter - Sunland inverter
1. Please explain the maintenance function of the inverter?
(1) After detecting the abnormal situation, the correction action will be carried out automatically, such as overcurrent loss rate prevention, regeneration overvoltage stall prevention.
(2) After detecting the abnormality, the PWM control signal of the power semiconductor device is closed, so that the motor can park automatically. As...
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