Tel：0517-80969998
E-mail：linda.liang@jemec.com.cn
Address：Room 1102, Haichuang Space, No. 12 Tongyuan Road, Huai 'an Economic and Technological Development Zone
Factory and warehouse：No.275 Qianjiang Road, Huai 'an, Jiangsu
Tel：0086 517 80969995
Xuyi Huayang Steel Tube Co. Ltd is a professional steel tube manufacturer, was also a big energy consumer. In order to reduce energy consumption thus to increase the profit, Huanyan entrust JEMEC to improve and optimize their motor to for energy-saving.
The energy-saving improvement for hot-roll steel tube machine
| The original hot-roll steel tube machine was driven by 2x JR series induction motor, one motor’s type is: JSR137-6A, power 320kW and another is JSR128-6, power 155kW, duty type: S6, load duration about 50%. The original motors’ efficiency was low, and had worked for many years. Furthermore, because one motor’s power was not enough to drive the machine, another parallel driven motors were adopted. When make small size tubes, one motor didn’t work but being driven by another motor. In this case, there’s big power waste. |
After careful evaluation, JEMEC raised the plan of using PMSM motor to replace the JSR motors, the details are:
The performance of the PMSM motor
Type：JEM400-1000-Z355M8
Output power：400KW
Service factor：1.2
Efficiency：97%
The photos of the construction site：
Calculation of energy-saving:
The input power of original motors
No load:
At load:
Type | Power | Eff. | P.F | Actual load power | Actual load P.F | Reactive power | Actual input active power | Actual no load P.F. | No load input reactive power |
JSR137-6A | 320KW | 92% | 0.89 | 254 | 0.86 | 151 | 35.7 | 0.31 | 113 |
JSR126-6 | 155KW | 91.50% | 0.87 | 88.6 | 0.83 | 66 | 16.2 | 0.32 | 42 |
Active power consumed annually
(20hours/day, 360days/year)
[(254+88.6)*0.5+(35.7+16.2)*0.5]*20*360=1420200kW.h
Reactive power consumed annually
[(151+66)*0.5+(113+42)*0.5]*20*360=1339200kVa.h
The working current of PMSM motor when it was installed
The following calculation was based on: average working current: 545A, no load current: 40A, motor’s p.f. 0.95, the efficiency of inverter 0.97:
Annually active power:
(545A*380V*1.732*0.5+40A*380V*1.732*0.5)*0.95/0.97*20*360=1357505kW.h
Annually reactive power:
Reactive power=sqrt(1-0.98^2)*(1357505/0.98)=275653kVA.h
Comprehensive power saving
（1420200-1357505）+0.04*（1339200-275653）=105236kW.h
*Note: the comprehensive power save is calculated according to GB/T 34687.1-2017, in which KQ=0.04
Tel：0517-80969998
E-mail：linda.liang@jemec.com.cn
Address:1102 Hai Chuang Plaza,No. 12 Tong Yuan Rd, Huaian city Jiangsu Province , P.R.China
Factory and warehouse：No.275 Qianjiang Road, Huai 'an, Jiangsu
Tel：0086 517 80969995
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