Standard No.:	CJ/T 458-2014
English Name:	Technical specification of system for the levitation control of medium-low speed maglev transportation vehicle
Chinese Name:	中低速磁浮交通车辆悬浮控制系统技术条件
Chinese Classification:	S51    Railway passenger coaches
Professional Classification:	CJ    Professional Standard - Urban Construction
Issued by:	MOHURD
Issued on:	2014-07-14
Implemented on:	2014-12-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	7500 words
Price(USD):	220.0
Delivery:	via email in 1~2 business day

CJ/T 458-2014 Technical specification of system for the levitation control of medium-low speed maglev transportation vehicle 1Scope This standard specifies the system composition, environment conditions, requirements, inspection and testmethods, inspection rules, marking, packaging, storage, and quality assuranee of the levitation control system ofthe medium and low speed maglev vehicle. This standard is applicable to the manufacturing, test and acteptance of the levitation control system ofmedium and low speed maglev vehicle (hereinafter referred to as "the vehicle"). 2 Normative references The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenced document(including any amendments) applies. GB/T 4208-2008, Degrees of Protection Provided by Enelasure (IP code)GB/T 13306.Plates GB/T 21414,Railway Applicatons-Rolling Stock-Protective Provisions Against Electrical HazardsGB/T 21563-2008,Railuay Applications-Rolling Stock Equipment-Shock and Vibration Tests GB/T 24338.4,Railumy Applications-Electromagnetic Compatibility-Part 3-2: Rolling Stock-ApparatusGB/T 25119-20T0,Railuay Applications-Elecrone Equipments Used on Rail Vehicles CJ/T 375,General Technical Specjfication for Medinam and Lon Speed Maglev Vehicles 3 Terms and definitions For the purposes of this document, the terms and definitions given in CJ/T 375 and the following apply. 3.1 levitation bogie A mechanical structure that supports the vehicle body and transfers levitation, guidance, traction and brakingforce,and has function of mechanical decoupling ability to adapt to the curve and irregularity of track. 3.2 levitation module A basic unit with functions of levitation, guidance, and traction of the vehicle. The levitation module ismainly composed of support arms, longitudinal beam, electromagnet and traction motor, and two such modules areconnected by anti-rolling beams to form a levitation bogie. 3.3 levitation control system A system that achieves vehicle levitation funetion. It is composed of levitation controllers, levitationelectromagnets and levitation sensors. CJ/T 458-2014 3.4 levitation controller An electrical device that control the gap between levitation electromagnet and the track so as to stabilize thelevitation of the electromagnet. It includes a power unit and a control unit. 3.5 control unit A unit that receives signals from levitation sensors, power unit and levitation instructions, and processesthem to generate control signals. 3.6 power unit A unit that amplifies the power of the control signals from the control unit, and drives the levitationelectromagnet. 3.7 magnetic levitation A control to keep the levitation gap stable and to achieve noneontact between the vehicle and the track bymeans of controlling the current through the levitation electromagnet. 3.8 levitation gap The vertical distance between the upper surface of the magnetic pole of the levitation electromagnet and thebottom surface of the F-shaped rail when the yehile is levitated. 3.9 levitation gap deviation The deviation between actuapleyitation gap and nominal levitation gap. 3.10 levitation and guidance control The control to keep allowable levitation gap by controlling the exciting current of the levitation electromagnetbased on feed backs of the levitation gap signal, the vertical acceleration of the electromagnet, etc. When theelectromagnet transversely deviates from the F-shaped rail, the lateral component of levitation foree would guidethe magnet to follow the rail. 3.11 levitation electromagnet An electromagnet that generates controlled electromagnetic force to achieve levitation and guidance functionunder the action of exciting current. It is mainly composed of exciting coil, polar plates and iron core. 3.12 levitation sensor A device that measures specific state variables of a levitation control system, such as levitation gap, verticalacceleration of the electromagnet, etc., and converts them into electrical signals. 3.13 exciting current The current that flows through a levitation electromagnet. 3.14 levitating up The process that the levitation electromagnet rises up to reach the nominal levitation gap from the landing