Switched Reluctance Driver system (SRD)
Switched Reluctance Driver system is the new generation drive system of stepless drive following DC motor drive, AC asynchronous motor variable-frequency drive. It is high-tech products of mechatronics based on modern microelectronics technology, digital technology, power electronics and modern control theory. Its comprehensive performance is higher than conventional drive systems.
It consists of two parts of the controller and the switch reluctance motor. The controller consists of embedded microprocessor, LSI, power devices of power electronics and software. The motor is doubly salient structure of stator and rotor. The rotor is made of silicon steel sheet and no winding and permanent magnets. The stator is wounded by centralized winding. The motor can be designed into different number of phases according to the requirement.
Capabilities:
 •Operator can directly set the motor speed with the operation panel, and also can do this through communication.
 •Speed and feedback can be adjusted and controlled with PID.
 •Braking function
 •Protection function of over voltage, low voltage, over current, over load, over heat, short circuit, over speed and feedback over limit, etc.
 •PLC function
 •Remote communication
Features:
Large starting torque and low starting current. When Starting torque reached 150% of the rated torque, the starting current is only 30% of the rated current.
Frequent starts and stops, forward and reverse rotating, four-quadrant operation and regenerative braking.
The precise control of the position and speed can be realized, and it can run at low speed for a long period.
High efficiency, energy saving. In its wide speed range, its efficiency is at least 10% higher than conventional drive systems. The high efficiency is more pronounced under low speed and unrated load.
The controller has a multi - way digital, analog interface and RS232 communication interface. It can enable remote monitoring, and convenient dock with the PLC, computer and other external devices.
Simple motor structure, no winding and permanent magnet of rotor, high mechanical strength, strong overload capacity, long service life.
High power factor, it is above 0.9.

Specification:
◎Power input
   •AC or DC power
   •Requirement of AC:
   ——Voltage offset fluctuation＜±15%, Short-term fluctuation doesn’t exceed±20%.
 ——The frequency fluctuation doesn’t exceed±5%, The rate of frequency change per second does not exceed ± 2%.
   •Requirement of DC:
——Voltage fluctuation range is ±10% of the rating, peak fluctuation of instantaneous voltage does not exceed 20%.
  ——DC voltage ripple ( peak - valley ) does not exceed 15 % of the rated voltage.
◎Torque
   Under rated voltage, the maximum torque of the motor in speed range of constant torque characteristic is not less than 130% of the rated torque. Usually below the rated speed is the constant torque characteristic area, above the rated speed is the area of constant power characteristics.
Under rated voltage, the starting torque of the motor is not less than 150% of the rated torque. Usually measured stall torque value as a starting torque.
   
◎Capability of overload
   In continuous operation at rated output current, it allows the applied of aperiodic overload. Under 1 / 3 rated speed, 150% rated torque can run two minutes. Under rated speed it allows 110% of rated load running one hour.

◎Speed stable accuracy
   When the motor is in continuous operation at a specified speed and the specified load and the supply voltage in a predetermined range changes, the speed stable accuracy of the motor is δ ≤ 0.1 %.
◎Rotation speed variation rate
   When the motor is running at a specified speed and the load changes from no-load (generally not more than 10% of the rated load) to the rated load, the change rate of motor speed is S ≤ 1 %.

 Speed range
    The minimum speed of the motor should be not more than 100r/min.
No special requirements, the maximum speed is set at 105% to 110% of the rated motor speed, this value is the speed controller set top-limit.
Applications
General machinery, Oil field machinery, Textile machinery, Mining machinery, Power generation equipment (wind power), Electric Screw Press, etc.

 Shandong Kehui Power Automation Co., Ltd. was originally known as Zibo Kehui Electric Co., Ltd. and the private Zibo Kehui Electric Instrument Research Institute founded in 1993 and 1991 respectively.
    Shandong Kehui Power Automation Co., Ltd. develops, produces and sells power cable fault monitoring equipment, power distribution automation equipment, railway power automation and switched reluctance motor drive system. It has an Automation Department, a Switched Reluctance Motor Department, and a subsidiary of Jinan R&D Center and Jinan Kehui Automation Engineering Co., Ltd., domestic offices in Shanghai, Guangzhou, Chengdu, and Xi’an, etc. and overseas offices in London and Seattle. It has over 260 employees now, of whom 60% have a bachelor degree or above. In 1998, it was certified to ISO9001 Quality Management System. It is a high-tech enterprise designated by the Department of Science & Technology of Shandong Province and one of the “Top 10 Excellent Software Enterprises” rewarded by the Department of Information Industry of Shandong Province.

    It is headquartered in Zibo, a famous industry city of middle Shandong. Shandong Kehui Science and Technology Park covers an area of over 120 mu, with exquisite environment and complete facilities. It has power automation labs, power monitoring labs, and switched reluctance motor labs equipped with complete facilities for development, production and inspection, good network and communication ability, sophisticated office and logistics facilities, providing a broad space for further development. Kehui Jinan R&D Center with a building area of 4,000 square meters, located in Jinan High-tech District Software Park, will attract more talented people to join in Kehui and strengthen Kehui in developing and introducing new technologies.

    Shandong Kehui Power Automation Co., Ltd. has been taking technology innovation as the lifeline of its development. A technology development team of high quality led by Doctor Xu Bingyin was established including 5 doctors, and more than 30 masters. Kehui, well-known for its specialty in power cable fault monitoring, is China’s only manufacturer providing complete solutions on fault monitoring and positioning of power cable, distribution wire, and transmission wire. The T-series power cable fault detection instruments, XJ-series distribution wire fault monitoring and positioning system, and XC-series traveling wave ultrahigh-voltage transmission wire fault ranging system developed have reached international advanced level, and solved the faults positioning problem that has obsessed power departments for a long time. Winning the 2nd Prize of National Technology Invention, and the Award for Progress in Science and Technology of Shandong Province, the products occupy over 50% domestic market share, and have been exported to Britain, Italia, Africa, South Asia and South America, etc. In 1994, for the first time in China, Kehui developed power system synchronous clock for receiving GPS satellite signal, which has been applied to over 6000 stations and factories in China. The PZK-series distribution automation terminal unit, developed by Kehui in 1997, with the new technology of embedded system adopted, has reached international advanced technology level, and over 10,000 sets have been put into operation. As the first company who started the railway power automation business in China, the KH-series railway power dispatching automation system and distribution substation automation system developed by Kehui has been introduced to over ten railway administrations in China. The SRD-series switched reluctance motor drive system, developed by Kehui in 2005, passed the verification performed by Yao Fusheng and Lu Bingheng, academicians of China Academy of Engineering, and Li Haifa, Professor of Tsinghua University, and was considered to be international advanced. The SRD-series product, with good energy-saving effect, low starting current, small starting torque, solid structure and high reliability, is a major breakthrough of drive system, and has a good market prospect.

    In the business principle of “People Orientation, Customer Supremacy, Continuous Innovation, Constant Improvement”, Shandong Kehui Power Automation Co., Ltd. strives to provide customers with better products as well as sincere, thoughtful, professional and timely service. While developing business, Kehui strengthens the team construction, basic management construction, and enterprise culture construction, and has built up efficient and normalized management mechanism with international standards, to achieve sustainable and healthy development of the company through the growth of organization and the enhancement of management level.
    In future, Kehui people will continuously carry forward the pioneering spirit of “Struggle, Innovation, Improvement”, expand the business scale, enhance management level, and promote the competitiveness comprehensively, to build Kehui as a power monitoring and automation enterprise with strong economic strength and outstanding innovation ability and make Kehui first-class in China and internationally influential.