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AC Excited Track Eddy Current Brake and Its Braking Method

A technology of eddy current brake and AC excitation, which is applied in the direction of brake components interacting with the track, asynchronous inductive clutch/brake, railway braking system, etc. reduce the problem, achieve the effect of reducing temperature rise, prolonging life, and improving braking force output

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the eddy current on the rail generates a large amount of heat when the existing DC excitation rail eddy current braking technology exists for train braking, which increases the temperature of the rail and affects the eddy current braking force. At the same time, the temperature rise also makes the rail The mechanical characteristics of the rails change, which makes the rails softer and reduces the life of the rails. In addition, the rail eddy current braking requires an external excitation power supply, which consumes electric energy during braking. , the braking force is small, and the applicable train speed range is narrow
Now provide AC excitation track eddy current brake and its braking method

Method used

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  • AC Excited Track Eddy Current Brake and Its Braking Method
  • AC Excited Track Eddy Current Brake and Its Braking Method
  • AC Excited Track Eddy Current Brake and Its Braking Method

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specific Embodiment approach 1

[0032] Specific implementation mode one: refer to figure 1 and Figure 4 Specifically illustrate this embodiment, the AC excitation rail eddy current brake described in this embodiment, it comprises eddy current braking unit, excitation control inverter 1, multi-phase rectifier 6 and excitation capacitor bank 3,

[0033] The eddy current braking unit includes a primary iron core, a primary control winding 2-1 and a primary power winding 2-2,

[0034] Slots are made on the side of the primary core facing the air gap perpendicular to the direction of movement, and two sets of ring-shaped multi-phase symmetrical windings are embedded in the slots, which are respectively the primary control winding 2-1 and the primary power winding 2-2,

[0035]The output end of the primary power winding 2-2 is connected to the excitation capacitor bank 3 in parallel, the output end of the primary power winding 2-2 is connected to the AC input end of the multi-phase rectifier 6, and the DC outpu...

specific Embodiment approach 2

[0039] Embodiment 2: This embodiment further explains the AC excitation track eddy current brake described in Embodiment 1. In this embodiment, the multi-phase rectifier 6 is an uncontrollable rectifier or a controllable rectifier.

specific Embodiment approach 3

[0040] Specific implementation mode three: refer to figure 2 Specifically illustrate this embodiment, the AC excitation rail eddy current brake described in this embodiment, it comprises eddy current braking unit, excitation control inverter 1, energy absorbing resistor group 4 and excitation capacitor group 3,

[0041] The eddy current braking unit includes a primary iron core, a primary control winding 2-1 and a primary power winding 2-2,

[0042] Slots are made on the side of the primary core facing the air gap perpendicular to the direction of movement, and two sets of ring-shaped multi-phase symmetrical windings are embedded in the slots, which are respectively the primary control winding 2-1 and the primary power winding 2-2,

[0043] The output end of the primary power winding 2-2 is simultaneously connected to the excitation capacitor group 3 and the energy absorbing resistor group 4 in parallel, and the AC output end of the excitation control inverter 1 is connected ...

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Abstract

The invention discloses an alternating-current excitation rail eddy-current brake and a braking method thereof and aims at solving the problems that in the existing direct-current excitation rail eddy-current braking technology, when a train is braked, a great amount of heat is generated by eddy currents on steel rails, the rail temperature is raised, the eddy-current braking force is affected, meanwhile, mechanical properties of the steel rails are changed due to the temperature rise, the steel rails are softened, and steel rail lives are shortened; in addition, an excitation power source is required to be added for rail eddy-current braking, electric energy needs to be consumed in the braking process, danger of outage and brake failure in case of insufficient electric energy exists, and when the train is at the low speed, the braking force is small and applicable to the narrow vehicle speed range. A groove is formed in the side, facing air gaps, of a primary iron core in the vertical direction, a control winding and a power winding are placed in the groove in an embedded mode, the power winding is in parallel connection with a polyphase excitation capacitor bank and the input end of a polyphase rectifier, and the output end of the polyphase rectifier is connected to a direct current bus of a vehicle main traction motor inverter; the output end of an excitation control inverter is connected with the control winding. The brake can be applied to train braking.

Description

technical field [0001] The invention relates to an AC excitation rail eddy current brake and a braking method thereof, belonging to the field of motors. Background technique [0002] The high-speed train involves two key issues of train driving and braking. Among them, the braking of high-speed trains should be given enough attention. The basic idea of ​​high-speed train braking is the same as that of train braking at conventional speeds, that is, to consume the kinetic energy of train motion to slow down or stop the train. Because the kinetic energy of high-speed trains is much greater than that of ordinary trains, and the coefficient of adhesion between the wheels and rails under high speed and the friction coefficient between brake shoes and moving wheels are greatly reduced, high-speed trains must adopt a new braking system. According to the analysis of existing data, the braking of high-speed trains adopts the combined braking system of regenerative braking, eddy curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L7/28H02K49/04B61H7/08
CPCY02T10/64Y02T10/72
Inventor 寇宝泉谢逸轩牛旭贺铁锐赵晓坤邵一
Owner HARBIN INST OF TECH
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