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Electric Motor Test Bench/dynamometer is advantagd area for Inomax 4Q regenerative drive. Here share with you some details.   Introduction of motor test bench project The electric motor test bench includes 2 motors, one is MUT (Motor under test), the other is DM (Driving motor). During the test, the controller controls the motor speed and torque. One motor works under motoring mode, the other motor works under generator mode. The system can realize features: 1.Motor durability and mechanical properties 2.Motor temperature rise and overload performance 3.Motor field weakening performance and efficiency, power factor 4.Display voltage, current, torque, speed, output power, and efficiency in real time VFD selection for motor test bench project   1.Power unit To make sure the motor constant torque output, keep DC bus voltage stable, and reduce the interference in the site, select Inomax AFE (Active front End) as rectifier, Inomax AFE rectifier adopts IGBT to replace diode rectifier, comes standard with LCL filter, input THDi

Shougang Group is one of the top 5 ultra-large steel manufacturers in China and is also a state-owned enterprise. The annual steel production is approximately 40 million tons.   Our cooperation with Shougang is based on project renovation. The previous ABB drives were broken and needed to be replaced. They have high request of the new frequency drives, must be better or equal quality and performance than ABB ,and more competitive price. There have more than 10 companines participate the tender. After multiple comparisons and screenings, we win the tender. Since the transformation project can only be completed during the product downtime period, the projects currently completed include: Shougang 1580 hot rolling mill, replacing ABB's ACS800, voltage range from 380V -690V, minimum power 55KW, maximum power 2000KW, Involving processes of winding, unwinding, straightening, and leveling; The models we supplied include single unit drive, multi-module drive and 4-quadrant regenerative drive. Shougang 1580 hot-rolled vertical roll, replaced by Siemens 6SE70, all have ProfibusDP communication; Replacement of 90-ton clamp crane for steelmaking, communication is Profinet, Siemens 1513PLC, Reliable. Efficient.Cost effective. We keep what we promise. As a professional manufacturer for frequency drives with more than 12 years of industry experience,Inomax offers: 1,Frequency drives for Metalgury, Marine,Mine,Oil & Gas,HVAC, and so on. 2,Special drives for winder/unwinder,for tower crane ,for CNC machines,for BCP pumps. 2,Complete solution provider for different application project. Inomax is your trusted worldwide partner in AC frequency drives,AC servo drive and solar pump inverters, We are completely geared towards our original intention of being client-centric focusing on offering the best experience for the customer, create value, stay perseverant with every little detail, insist on building the confidence and trust, and bring the biggest benefits and value to our customers!

The steel plate slitting machine is a device for longitudinally slitting metal wide coil materials. It is used for slitting metal coil materials: such as strip steel, stainless steel, copper strip, aluminum foil, etc. Market operators, rolling mills, electrical industry, automobiles, stamping parts, etc.). Different from general shearing equipment, this equipment rolls the circular blade on the plate to complete a new type of infinitely long shearing action.   Slitting machine structure: It is composed of unwinding (unwinding), feeding positioning, slitting and slitting, curling (winding) and other equipment. Its main function is to cut the wide coil material into a narrow width and a certain size of coil material to prepare for other processing procedures in the future.   When metal slitting machine manufacturers design the slitting machine production line, they specially designed an integrated structural scheme, which can significantly improve the rigidity of the mechanical structure, reduce the degree of vibration, and help improve the quality of the finished product. However, this structure relies on the speed and torque control accuracy of the drive to the motor. Through the excellent speed and torque mode control of the high-performance drive, it not only improves the production efficiency, but also reduces the mechanical failure rate and maintenance cost.   Equipment such as unwinding (unwinding), slitting and slitting, coiling (winding), laminating and other equipment needs to be equipped with a motor and a driver. The feeding positioning and edge feeding machines need to be equipped with two motors and drivers, and each transmission part is driven by a servo motor.   8pcs Inomax ACS880 drives control the servo motors and communicate with PC through Profinet to realize speed and torque mode control.   The motor has been coupled with the machine during general debugging on site. Due to the large load rate and rotational inertia of the motor, the dynamic identification cannot achieve the effect of accurate identification. Inomax ACS880 driver can perform static identification on the basis of the motor stopping and not rotating, and accurately identify the characteristics of the motor data to build an accurate motor model. In order to let drive perform direct torque control to achieve a better control effect.   Inomax ACS880 driver has superior performance and can control the servo motor to output high torque at low speed, meeting the requirements of different complex working conditions in different application sites. And communicate with PC by Profinet communication and exchange data in real time, which can ensure the stable and reliable operation of the overall system of the slitting machine. And when controlling the slitting machine, sanding line and laminating line with high tension requirements, the steel plate will be unrolled for tension control, The plate will naturally oscillate. In this environment, the driver increases the vibration suppression function in the torque mode. Even when the machine is running at very low speed, the state is still stable, and the plate has no vibration.   Key advantages of Inomax ACS880 drive:   ①Excellent performance and rich functions   ACS880 is a high-performance direct torque control inverter, providing customers with excellent performance and rich functions. Inverter power from 1.5 to 4000kW, suitable for all kinds of complex application.   ② high performance   ACS880 drive use direct torque control technology, which has fast torque response and high-speed precision control to ensure superior control performance.   ③ Drive synchronous and induction motors   ACS880 VFD can not only drive asynchronous induction motors, but also drive synchronous servo motors, asynchronous servo motors and torque motors with feedback or without feedback to achieve perfect motor adaptation.   ④ Modular and compact design   Book-shaped design, small size, multi-module scheme is available for more than 160KW. External options include equipment such as input chokes, input filters and braking resistors for different system configurations.   ⑤ High-performance software   Through the special monitoring software, it is possible to monitor the status of the motor and the driver, monitor the refresh speed of the high-end motion control level online, and intuitively analyze the problem of the field application.

About rolling mill in metallurgy,last year we did one project in a stell plant in henan province last year, it is our regenerative drive application in 20-roll reversible mill project. In total of 4 motors: 1 pcs of 1900kW main winding motor, 2 pcs 2000kW winding motors and one 250kW unwinding motor. The input voltage of our inverter is 690VAC. The rated frequency of the main coiling motor is 18.2hz, the maximum operating frequency is 56.6hz, the rated frequency of the coiling motor is 12.7hz, the maximum operating frequency is 48.2hz, the tension control accuracy is less than 1%, the maximum rolling line speed is 600m/min, and the rated voltage of the motor is 660V. Our design for this project is 5pcs AFE +16pcs SMM inverter.

Converter requirements for the AC VFD control system: ​​ (1) The mechanical tilting converter can continuously rotate 360°, driven by 4 sets of 90KW variable frequency motors, and can stop at any position accurately. It should also have speed regulation performance according to process requirements. Its tilting position can have certain interlocking requirements with related equipment such as oxygen lance, ladle car and fume hood; (2) In the process of operation, there must be maximum safety and reliability. When a certain part of the electrical or mechanical failure occurs, the tilting machine should be able to continue to operate for a short time and maintain it until the end of the first steelmaking furnace. (3) The tilting machine should have good flexibility to buffer shock load and torsional vibration generated by starting and braking   Solutions: Since these 4 motors are rigidly connected, the speeds of all motors are required to be absolutely synchronized, so the transmission of the 4 motors adopts master/slave control, and the data is transmitted between the 4 drives through internal communication. The inverter is used as the host, which adjusts the speed and sets the output torque. Other inverters, as slaves, follow the torque response of the host, and completely solve the "nodding" and "shaking" problem caused by the asynchronous operation of the motor.   The converter capacity of Henan Yaxin Steelmaking Plant is 100t, the tilting motors of the converter are 4 sets of 90kW frequency conversion motors, and the oxygen lance motors are 2 sets of 75kW frequency conversion motors; the upper control system adopts GE's 90-70 series PLC. Between the 4 drives, the master sends a control command to the slave, and the slave accepts the start and stop commands and the set value of the torque sent by the master to act. When a certain slave fails, it does not affect the communication and action of the master and other slaves, so it can continue to run until the appropriate time for maintenance; when the master fails, the slave receives a signal to switch to the master to make the system normal Operation, wait until the appropriate time to repair the faulty equipment. Since the AC VFD is a load with high starting torque, direct torque control is adopted, the stop mode is ramp stop mode, and a braking chopper and braking resistor are used to absorb the feedback energy.