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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Application of frequency converter on cylindrical grinding machine Application of frequency converter on cylindrical grinding machine
Standardize the cylindrical grinding machine used in machining; the grinding wheel motor works according to the traditional starting circuit. After the motor is started, it works according to the extra speed; because the grid voltage has a certain shake; the friction load of the grinding wheel and the workpiece changes constantly; it will affect the speed of the motor. Error; the standard grinding wheel motor starting circuit usually only needs a processing speed; it is difficult to get used to the different processing speed of the different workpiece size; so the processing precision of the processed workpiece is difficult to ensure. Therefore, the processing quality and processing are improved. Power; energy saving and other aspects; the use of variable frequency speed control skills in cylindrical grinding machines; can receive satisfactory results. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The products processed by the machining professional cylindrical grinding machine are complex; the workpiece size is different; the machining precision is different. The relative demanding speed of the grinding wheel is different from the spindle speed; simply adjusting the spindle speed to satisfy the workpiece processing line The speed is difficult to adjust to the ambition. Because of the stress and tortuosity of the shaft in the process of machining; the torque of the grinding wheel feeding will be different during the grinding process; thus, the output speed/torque of the grinding wheel is different. Change; correspondingly will occur the vibration knife pattern / burnt lines, etc.; grinding accuracy is difficult to ensure; thus the formation of low production power; boutique rate is lower.
Follow the development of power electronics skills; frequency conversion speed control skills are more and more widespread; in the machining professional frequency converter application has received a very good role. Inverter stepless speed regulation; soft start; constant torque output is extremely Satisfied with the demand for constant speed / constant torque of machining equipment.
The load characteristics of the cylindrical grinding machine are different according to the diameter of the shaft. The size of the grinding force depends on the output torque of the grinding wheel motor. The high-speed section of the spindle motor; the output speed of the grinding wheel is constant; the diameter of the workpiece to be processed is not ã”笾 ã”笾 å® å® ã¶å´‚喙㜠㜠㜠㜠㜠ç¼è¯˜ ä¿£ ä¿£ ä¿£ ä¿£ ä¿£ãƒé« ãƒé« 诒浯螅 诒浯螅 诒浯螅 诒浯螅 ç¼ ç¼ è¯¤é˜• 诤阕 诤阕 诤阕 诤阕 诤阕 诤阕 诤阕 诤阕 诤阕 诤阕 诤阕 æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’ æ’The constant torque output can compensate for the above shortcomings.
The selection of the frequency converter is based on the characteristics of the system work; think about the operational requirements of the machining of the cylindrical grinding machine and the cost of equipment investment; use the universal V/F inverter with active torque promotion. Take the Dongyuan Speecon 7200MA series For example, according to the power of the grinding wheel motor, the inverter of 18. 5KW/15KW is selected; 15KW is taken as an example; the extra voltage is three-phase 380V; the output current is 32A; the frequency control is 0. 5 400HZ; the speed control is 0.1%; The load can be 150%/60S. It has active torque promotion function; flexible PWM control; can achieve lower noise operation; more than 10 segments of speed control.
The starting and starting circuit of the main grinding wheel motor of the external grinding machine of the system is selected to use the star-delta transformation starting circuit. The inverter is used to replace the original circuit; the normally open contact of the original contactor is used to control the operation of the inverter; Inertia; the soft start time of the inverter is set to 10S; the stop brake time is set to 15S; according to different types of grinding wheel, the torque can be adjusted between 50% and 80%. The system speed is adjusted by external adjustable potentiometer Conditioning frequency; adjusted according to the customary speed of the workpiece diameter; subject to the mechanical strength/noise/oscillation of the motor at high speed; the maximum frequency of the motor is set to 60HZ, the heat dissipation of the motor is poor due to the low speed; The shifting factor and the maximum processing workpiece scale; the lowest frequency is set to 35HZ; the reference frequency is set to 50HZ. It can be known from the previous load characteristics analysis; the high speed section is constant power property; the low speed section is constant torque property; and the low demand speed load demand torque Large; overload can be strong. Above the motor reference frequency; to ensure that the motor is not over pressure; use constant voltage frequency control. Motivation theory knows; when the voltage is constant; when the frequency increases; the magnetic flux under each pole of the motor decreases with the increase of the frequency.硎涑龉β什æ§æ´Œçš‡è‰‰æ„ŽÎ²å®žé‰ä¼²çš‡ç³œè¯¤æ„Žç³œè¯¤æ„ŽÎ²çŸ¢æ¶¸. Below the fundamental frequency; to ensure that the magnetic flux under each pole of the motor is unchanged; V/F=constant variable voltage variable frequency speed regulation When the current of the motor is extra current; the allowable output torque of the motor is constant; it is attributed to constant torque speed regulation; it is suitable for constant torque load. However, when the speed is low, the internal resistance of the motor cannot be neglected; F is a constant; then the motor torque will be reduced. 薹愕 åˆ åˆ æ¶¸åŒ¾èŸ®æ·–å®èž… 涸匾蟮淖å®èž… 康 康 ç”· ç”· ç”· ç”· ç”· 埽 虼 虼 虼 虼 虼 虼 虼 æ·¦ ス ス 埽 埽 埽 埽 埽 ≡ ≡ ≡ ≡ ≡ V/F curve is corrected.
Precautions drawn by the system The precision of the grinding wheel balance should be improved: the motor should work at extra speed; in order to reduce the oscillation at high speed; the dynamic balance of the motor rotor and the grinding wheel should be improved; and proofread.
Heat dissipation at low speed: The motor is cooled by the self-cooling fan method; the heat dissipation condition is deteriorated at low speed; the load torque is large; the motor temperature is added; therefore, the minimum speed is set so that the motor temperature difference does not exceed the allowable value. according to.
In the frequency conversion speed regulation, the inverter output is rich in high-order harmonics; electromagnetic noise will occur in the motor; therefore, the output terminal should be equipped with a zero-phase noise filter; the auxiliary radiation disturbance and the induction noise can be reduced.
The parameter setting item of the inverter is important to determine the functions of the slewing/highest frequency/stall!
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Application of frequency converter on cylindrical grinding machine
Source: China Bearing Network Time: 2017-12-26