The transducer application on machining industry grinder

Introductive: Standard machining place uses grinding machine, emery wheel electromotor all moves by the traditional circuit that start. After electromotor is started, run according to rated rotate speed, because voltage of electrified wire netting has wave motion of particular grinding machine, grinder of emery wheel workpiece grinds laden and continuous grinding machine changes, can affect error of electromotor grinder rotate speed, starting circuit of electromotor of standard emery wheel machines speed one kind only commonly, get used to grinder of different workpiece size to ask different grinder machines opposite linear velocity hard, so that what machine workpiece grinder,treatment precision assures very hard. Accordingly from raise treatment quality to machine efficiency, the respect such as managing the sources of energy considers, use frequency control technology at grinder, can get satisfactory grinder result. Line of the products of grinder of treatment of place of machining industry grinder is various, workpiece size measurement is different, the requirement machines precision each different. Opposite grinder asks emery wheel rotate speed differs at linear velocity of main shaft grinder, pure grinder adjusts rotate speed of main shaft grinder to satisfy workpiece grinder to machine linear velocity to adjust good position very hard. As a result of axial lever kind stress of grinding machine of generation of treatment process place bends, grinding process can produce moment of force of grinder of emery wheel feed to differ, bring emery wheel to output rotate speed so / pitching moment is different grinder changes, corresponding grinder can produce Zhen Daowen / the grain that burn paste, grinding precision assures very hard, cause production from this efficiency is low, high-quality goods rate is low. Develop as grinder of technology of electric power electron, grinder of frequency control technology gains ground more and more, application of grinder of machining industry transducer gets result of very good grinder. Transducer grinder stepless speed regulation, soft start, constant torsion outputted great grinding machine to satisfy machining equipment to be spent to constant speed / requirement of constant torsion grinder. 2.

Grinder machines grinder load performance: According to lever of different grinder axis kind diametical grinder size, advocate rotate speed of grinder of emery wheel electromotor is equal to emery wheel to output grinder rotate speed. Size of grinding force grinder depends on grinder of emery wheel electromotor outputs torsion. Drive workpiece rotates high speed of grinder of electromotor of grinder main shaft paragraph, the photograph is changeless to outputting rotate speed at emery wheel, diameter of workpiece of place treatment grinder is small, grinding feed is little; Machine big diameter, long axis kind when workpiece, workpiece rotates grinder electromotor low speed paragraph, emery wheel feed is big, force of emery wheel grinding also greatens, electromotor is very difficult constant torsion / move below constant speed. Speed grinder change arose to be like Zhen Daowen / the grain that burn paste / the grinder such as treatment precision changes. Stepless speed regulation of grinder of frequency control electromotor, constant torsion output just can remedy afore-mentioned flaw. 3.

Transducer grinder chooses: Run grinder characteristic according to the system, the consideration satisfies machining grinder grinder to use isogon of charge of demand installation cost to spend a consideration, choose take automatic torsion to promote functional grinder vector transducer. With SANCH-S2000 the department is labelled exemple, differ according to power of grinder of emery wheel electromotor choose 18.

5KW/15KW grinder transducer, it is with 15KW exemple, 380V of rated voltage three-phase, output voltaic 32A, frequency is controlled 0.

5, 400HZ, speed is controlled 0.

1% , overload ability 150%/60S. Have automatic torsion to promote a function, flexible PWM control, can realize lower noise to move, rotate speed of 10 paragraphs of over grinder is controlled. 4.

Systematic grinder starts with timing: Grinder grinder advocate starting circuit of emery wheel electromotor uses a heavenly body more, trigonometry changeover starts circuit. Replace original circuit with transducer, use original contactor grinder to often open contact to control transducer grinder to move, the grinder of consideration emery wheel that start is inertial, set of the flexible time that start is transducer 10S, stop brake time set to be 15S, start moment of force according to emery wheel of different type grinder but 50% - - 80% between adjust set. Systematic speed is passed outside receive adjustable potentiometer adjustment frequency, according to workpiece diameter different grinder gets used to speed to adjust, because suffer when electromotor high speed grinder machinery intensity / noise / the element grinder limitation such as vibration, highest frequency set is electromotor 60HZ; Because the electromotor when low speed comes loose,hot effect is differred, consideration workpiece rotates grinder gearshift factor is real measure of work of the biggest treatment, lowermost frequency set is 35HZ, fiducial frequency set is 50HZ. By in front analysis of grinder load performance is knowable, quality of power of high speed Duan Weiheng, property of torsion of low speed Duan Weiheng, and laden requirement torsion is big when low rotate speed, overload capability is strong. Above of fiducial to electromotor frequency, to make sure electromotor is pressed nevertheless, use constant voltage frequency control. Talk by dynamoelectric mechanism knowable, when voltage changeless, when frequency increases, electromotor every extremely next grinder magnetic flux increase as frequency grinder and reduce; When electromotor electric current is rated electric current, the biggest allow to output torsion to reduce, concessional output power is changeless, belong to constant power timing, apply to constant power load. Fundamental frequency is the following, to assure electromotor every extremely next magnetic flux are changeless, use frequency control of transformation of V/F= invariable grinder, when electromotor grinder electric current is rated electric current, electromotor is concessional output torsion is changeless, belong to constant torsion timing, apply to constant torsion load. But when speed is inferior because of electromotor internal resistance cannot oversight, if still maintain V/F to be constant, criterion electromotor torsion will be reduced, torsion of laden requirement grinder is big when cannot satisfying low speed, function of overload ability powerful grinding machine, because this uses transducer grinder torsion to compensate a function automatically, curve of V/F of the grinder after the choice is compensated tries to amend. 5.

The system devises grinder note: Grinding emery wheel balances grinder precision to want to rise: electromotor move on rated rotate speed, to reduce vibration of the grinder when high speed, should raise dynamic balancing of grinder of electromotor rotor emery wheel to spend, try corrective. The grinder when low speed comes loose hot circumstance: Because electromotor is,come loose from means of air cooling fan hot refrigeration, hot condition comes loose to become poor when low speed, and laden torsion is bigger, electromotor temperature can increase, because set of grinder of this lowest rotate speed does not exceed feasible value with electromotor surface difference in temperature,be a basis. Because of transducer output is contained when frequency control tall second harmonic, meeting electromotor produces electromagnetism noise, because this outputs end to want to install filter of 0 photographs noise, can reduce faze of complementary blackberry lily and inductive noise. Item of set of transducer grinder parameter is main will invert / highest frequency / the functional lock such as stall is decided! CNC Milling CNC Machining