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As an open-loop control system, stepper motors have an essential connection with modern digital control technology. In the current domestic digital control system, stepper motors are widely used. With the advent of all-digital AC servo systems, AC servo motors are also increasingly used in digital control systems. In order to adapt to the development trend of digital control, most of the motion control systems use stepper motors or all-digital AC servo motors as the execution motors. Although the two are similar in control mode (burst and direction signals), there is a big difference in performance and application. Now compare the performance of the two.
First, the control accuracy of two-phase hybrid stepper motor step angle is generally 1.8 °, 0.9 °, five-phase hybrid stepping motor step angle is generally 0.72 °, 0.36 °. There are also some high performance stepper motors with smaller step angles after subdivision. For example, a two-phase hybrid stepper motor manufactured by SANYO DENKI can be set to 1.8°, 0.9°, 0.72°, 0.36°, 0.18°, 0.09°, 0.072°, and 0.036° by the dial switch. It is compatible with the step angle of two-phase and five-phase hybrid stepping motors.
AC servo motor control accuracy is guaranteed by a rotary encoder at the rear end of the motor shaft. Taking Shanyang's all-digital AC servo motor as an example, for a motor with a standard 2000-line encoder, the pulse equivalent is 360°/8000=0.045° due to the quadruple frequency technology inside the driver. For a motor with a 17-bit encoder, the driver receives one revolution of 131,072 impulse motors per revolution, that is, its pulse equivalent is 360°/131072=0.0027466°, which is the pulse equivalent of a stepper motor with a step angle of 1.8°. 1/655.
Second, the low-frequency characteristics of different stepper motors at low speeds are prone to low-frequency vibration phenomenon. The vibration frequency is related to load conditions and driver performance. It is generally believed that the vibration frequency is half of the motor's no-load take-off frequency. This kind of low frequency vibration, which is determined by the working principle of the stepper motor, is very unfavorable to the normal operation of the machine. When the stepper motor operates at a low speed, damping techniques are generally used to overcome the low-frequency vibration phenomena, such as adding a damper to the motor, or using a subdivision technique on the driver.
The AC servo motor operates very smoothly and does not vibrate even at low speeds. The AC servo system has a resonance suppression function that can cover the lack of mechanical rigidity, and the system has a frequency resolution function (FFT), which can detect the mechanical resonance point and facilitate system adjustment.
Third, the torque characteristics of different stepper motor output torque decreases with the increase of speed, and at high speeds will be sharply reduced, so the maximum operating speed is generally 300 ~ 600RPM. AC servo motor is a constant torque output, that is, it can output rated torque within its rated speed (generally 2000RPM or 3000RPM), and it is a constant power output above the rated speed.
Fourth, overload capacity Different stepper motors generally do not have overload capability. AC servo motor has strong overload capability. Take Shanyang AC servo system as an example, it has speed overload and torque overload capability. Its maximum torque is two to three times the rated torque and can be used to overcome the moment of inertia of the inertial load at the moment of starting. Because there is no such overload ability for the stepping motor, in order to overcome this kind of moment of inertia during selection, it is often necessary to select a motor with a large torque, and when the machine does not require such a large torque during normal operation, a torque occurs. Wasted phenomenon.
Fifth, the performance of different stepper motor control for the open-loop control, the starting frequency is too high or the load is too large prone to lost or locked-rotor phenomenon, stop overspeed is too high overshoot phenomenon, so to ensure its control Accuracy should deal with problems of rising and falling speeds. The AC servo drive system is closed-loop control, and the drive can directly sample the feedback signal of the motor encoder. The position loop and the speed loop are internally formed. Generally, there is no phenomenon of lost or overshoot of the stepping motor, and the control performance is more reliable.
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Metallurgical Machinery Bearing


Metallurgical rolling mill bearings are the main product of our company, annual output value is near two hundred million RNB. Products include deep groove Ball Bearings , Cylindrical Roller Bearing, spherical roller bearings, angular contact ball bearings, tapered roller bearings, thrust roller bearings about thousand varieties.

Xibei Bearing committed to develop metallurgical rolling mill bearings and replace imported bearing, has made significant achievements. Xibei Bearing developed E5729/761.425SU for Anshan Iron and Steel Group Corporation and 419954Q for Baoshan iron and steel plant, which alternative FAG and SKF bearing respectively, and was certificated as National New Product in 1991.Xibei Bearing equipped for big steel plant such as baosteel, shougang, wuhan, anshan iron and steel, panzhihua iron and steel, handan iron and steel and other oversize enterprises supporting the production of a variety of alternative imports of rolling mill bearing, widely substitute SKF, NSK, NTN, TIMKEN, FAG, KOYO and other broad brand products, mainly for heavy plate mills, such as seamless steel tube rolling for hot mill roller. These have reached the level of similar foreign products. Xibei Bearing supply for the Shanghai baosteel import mill alone provides more than 30 replace imported Roller Bearing , using performance got the user's high praise, be included in "baosteel spare parts jointly developed supply center member". These replace the imported bearing not only has the good economic efficiency, there is a wide range of social benefits.

Xibei Bearing pay attention on technical transformation, constantly introduce domestic and foreign advanced equipment and testing instruments; attaches great importance to quality management, and constantly improve product quality and grades. NXZ product not only replace imported rolling mill bearing for many domestic steel plant, but also as OEM for the TIMKEN in accordance with standard which higher than international with four row Tapered Roller Bearing for rolling mill. Xibei Bearing was brought into its global procurement plan, exportIndiaandEuropeand other regions.

In the process of development of form a complete set of metallurgical rolling mill bearings, the company continuously according to user's working conditions of the host and special requirements for personalized design and manufacturing, to meet user requirements.Under the condition of market economy, the user's requirements is the standard.So in the process of design and development, the company break the routine, breakthrough standards, implement a factory, meet the personalized requirements of users, occupy the market with personalized products and high quality service and win the trust of users.For metallurgical rolling mill bearings, in recent years, the company has 419952 q of Shanghai baosteel rolling a rolling bearing, tianjin company FCDP 5882240 e/HCC9, FC5274220E/C4, C4G482836 bearing, xicheng steel 116130 h, 116134 h, jiangsu province, jiangsu lian feng steel mill's FC 3248168 / C4, FC 3652168 / C4, FC / 4868192 / C4, FC / 5274200 / C4, 10777/750 of the chongqing southwest aluminum group sy, hangzhou steel mills, sanming steel users many kinds of bearing products such as assembly chamfering, clearance, inside diameter tolerance, and maintaining the frame structure, bearing marks code for the personalized design, good results have been achieved.

In recent years, the company is committed to the development of cold sheet mill bearing, for Indonesia's steel plant,Nigeria's steel plant , Hengshui sheet, Brillant inheritance (guangdong tengchong stainless steel factory), Foshan Jin Gangniu,Foshan jin west gold orchid, Gao Mingzhao xing yue in tinplate, guangzhou, Shenzhen huamei and community, Wuxi xinda aluminum processing, Taiwan, zhejiang xiehe steelskin, large Huang Shitong cold-rolled steel, Tianjin dextrys color plate, Wenzhou, Foshan industry unit cold sheet manufacturers, 900, 1050, 1200, 1380, 1400, 1450, six roller, four roller cold sheet mill supporting a variety of roller bearings, including four row cylindrical roller bearings, double row angular contact ball bearings, Deep Groove Ball Bearing, installation Angle contact Ball Bearing in pairs.1200 of the six roller cold sheet mill main bearing support roller FCDP / 130180650 / HCP5 and 1450 six roller cold sheet mill supporting roller main bearing FCDP / 146206750 / HCP5 are P5 (D) level precision, USES the high quality carburizing steel G20Cr2Ni4Amanufacturing, now the supply of more than ten domestic manufacturers more than 20 production lines, product quality is stable, in short supply, well received by users.In recent years, the company vigorously develop, Jimmy's mill with backing bearings, for guangdong east steel zhenpeng, foshan retailer, choi steel, jiangsu jiangsu menglan xin da among all nations, shanxi jinzhong, wisco steel developed ten kinds of backing bearings, used for twelve roll, 20 roll sheet mill wide support roller with groups, and form a batch production ability.

Reducer user can drive suzhou co., LTD., Po can drive tianjin co., LTD., co., LTD., bo bo can drive kaifeng can drive changsha co., LTD., zhenjiang reducer, jingzhou orca digital transmission machinery co., LTD., xuzhou east transmission machinery co., LTD., jiangsu tyrone reducer, taixing city general reducer, etc.

Company production of metallurgical rolling mill bearings with strong r&d and production strength, excellent product quality, good brand reputation, and metallurgical industry grow up together, not only for the use of rolling mill bearing units left a good impression, also won the mill design units, such as xi 'an cary company, shougang design institute, tianjin metallurgy planning and design institute, xi 'an heavy machinery research institute and the approval of the design unit.

Excellent equipment, perfect management and high quality products, reliable service to make my company production of metallurgical rolling mill bearings for various honors, roll bearing E5729/761.425 SU, 419954 q, 577796 s and 419954 s respectively won state-level key new products, 10779/560 SEC and D762992 three products won the autonomous region science and technology progress third prize respectively.

My company first-class technology, advanced equipment, over the years accumulated experience make me rolling mill bearing products market share has risen steadily, the product performance in the domestic advanced level.My company with excellent product quality, reasonable price performance ratio, timely delivery, good reputation and services meet the requirements of rolling mill bearing supporting the use of the user.

Metallurgical Machinery Bearing

Deep Groove Ball Bearing,Single Row Cylindrical Roller Bearing,Double Row Cylindrical Roller Bearing,Three Row Cylindrical Roller Bearing

Xibei Bearing Co.,Ltd. , http://www.nxzjck.com