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A variable frequency starting device and method

A technology of frequency conversion starting and frequency conversion equipment, which is applied to the starter of a single multi-phase induction motor, motor generator/starter, etc., can solve the problems of increasing cost, poor effect, and increasing the power of the main motor, so as to achieve cost saving, Diversified effects in application scenarios

Active Publication Date: 2019-10-15
SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When starting, with the rotation of the cylinder, the center of gravity of the material deviates from the center of the cylinder, and the load torque increases gradually. If the driving device cannot provide enough torque, the ball mill cannot start smoothly.
[0003] At present, the methods to start this type of equipment are: 1) Use the auxiliary motor to start at a low speed, and then switch to the main machine to run after the material is uniform. This method is mostly used for wet grinding with water added during grinding, and the effect is not good for dry grinding. And it is necessary to increase the auxiliary motor and the gear device with high transmission ratio; 2) increase the power of the main motor, although the starting torque of the ball mill is very large, its load is not heavy during normal operation, and this solution will significantly increase the cost

Method used

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  • A variable frequency starting device and method
  • A variable frequency starting device and method
  • A variable frequency starting device and method

Examples

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no. 1 example

[0037] see figure 2 , shows a functional block diagram of a variable frequency starting device 300 provided by a preferred embodiment of the present invention. The frequency conversion starting device 300 is applied to the frequency conversion equipment 200, and the frequency conversion starting device 300 includes a running state information acquisition unit 310, a judging unit 320, a signal generating unit 330, a frequency polarity switching unit 340, a counting unit 350 and a running state control unit 360.

[0038] The running state information obtaining unit 310 is used to obtain the running state value of the inertial load device 100 .

[0039] The running state value may include, but not limited to, the output current and output frequency of the frequency conversion device 200 .

[0040] After the inertial load device 100 is turned on, the frequency conversion device 200 starts to output current and frequency to drive the motor 110 to run, and the output current and ...

no. 2 example

[0064] The embodiment of the present invention also provides a variable frequency starting method, which is applied to the frequency conversion device 200. It should be noted that the basic principle and technical effect of the variable frequency starting method provided by the embodiment of the present invention are the same as those of the above-mentioned embodiments, and are For a brief description, for parts not mentioned in this embodiment, reference may be made to the corresponding content in the foregoing embodiments. In this embodiment, the running state values ​​are the output current and the output frequency of the frequency conversion device 200 .

[0065] see Figure 4 , the variable frequency starting method may include:

[0066] Step S501: Obtain the output current and output frequency of the frequency conversion device 200.

[0067] Understandably, step S501 can be executed by the running status information acquiring unit 310 .

[0068] Step S502: Determine w...

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Abstract

The embodiment of the invention provides a variable frequency starting device and method, and relates to the technical field of powder grinding. According to the variable frequency starting device and method, firstly the operation state value of inertia load equipment is acquired, then the operation state of the load is judged by judging whether the operation state value is in the preset threshold range, and a switching signal used for changing the preset frequency polarity is generated when the operation state value is in the preset threshold range so as to change the rotating direction of a motor and provide traction torque for the load, the load is enabled to reversely rotate under the effect of its own inertia and the traction torque of variable frequency equipment, the load is enabled to pass through the maximum potential energy point after multiple times of cycles and thus the load is enabled to normally start. With application of the method, the cost can be saved, the device and the method also have excellent effect on a ball grinding mill using a dry grinding method and the application occasions of the high-inertia heavy load are enabled to be diversified.

Description

technical field [0001] The invention relates to the technical field of powder grinding, in particular to a frequency conversion starting device and method. Background technique [0002] The ball mill is a device that crushes materials after they are crushed. It is widely used in cement, silicate products, new building materials, refractory materials, chemical fertilizers, black and non-ferrous metal beneficiation, glass ceramics and other production industries, for dry or wet grinding of various ores and other grindable materials. When the materials and steel balls in the barrel of the ball mill rotate in the barrel, they are brought to a certain height by friction and centrifugal force, and then fall under the action of gravity to impact and grind the materials to achieve the purpose of crushing the materials. When starting, with the rotation of the cylinder, the center of gravity of the material deviates from the center of the cylinder and the load torque increases gradua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/30
Inventor 徐静冯东升杨根胜杨跃农
Owner SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT