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A rail vehicle traction and braking system and method

A technology for rail vehicles and braking systems, which is used in the control of drives, vehicle components, railway vehicles, etc., to achieve the effect of extending service life, avoiding gear teeth, and avoiding gear damage.

Active Publication Date: 2021-02-19
成都图翎新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional electric motors and traction converters are unable to stably control torque at low speeds to provide stable and controllable braking force output

Method used

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  • A rail vehicle traction and braking system and method
  • A rail vehicle traction and braking system and method
  • A rail vehicle traction and braking system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] In one embodiment of the present invention, the rail vehicle only uses a motor to achieve braking. The system includes a motor, a position sensor mounted on the motor, and a traction converter connected with the position sensor and the motor. During traction, The traction converter calculates the rotation speed of the magnetic field according to the actual speed of the motor, the slip rate corresponding to the current working condition of the motor, and the target torque, and adjusts the current, voltage and frequency of the output three-phase power supply according to the rotation speed of the magnetic field and the target torque; Under the action of the three-phase power supply, torque is generated to provide the traction force of rail vehicle traction; in the braking process, the magnetic field rotation speed is also calculated according to the actual speed of the motor, the slip rate corresponding to the current working condition of the motor, and the target torque. A...

Embodiment 2

[0060] In another embodiment of the present invention, the rail vehicle uses the same traction control system as Embodiment 1. Further, in order to prevent the gear box from beating the teeth during the vehicle switching from acceleration or constant speed operation to deceleration operation, the traction The converter controls the motor to output zero torque during deceleration, and at the same time gives the motor a motor deceleration that is greater than the deceleration of the rail vehicle. The time difference Δt is calculated according to the gap between the gear teeth of the reduction box, the deceleration of the rail vehicle and the deceleration of the motor. The traction converter Control the motor to decelerate at the motor deceleration rate for Δt, and then start to output the braking torque, effectively avoiding the gears in the reduction box connected to the motor from hitting, avoiding gear damage, and prolonging the service life of the gears.

Embodiment 3

[0062] In another embodiment of the present invention, the rail vehicle uses the same traction control system, furthermore, a brake assembly is installed on the motor shaft, which is used for emergency braking or fast braking Under certain circumstances, the rail vehicle can be quickly decelerated to a stop by means of mechanical braking, further ensuring the safety of the vehicle and property.

[0063] In one solution of this embodiment, only one set of brake components is installed. When emergency braking is required, the brake component circuit is disconnected, the coil is powered off, and the compression spring pushes the armature to move and stick to the end surface of the brake disc to realize Mechanical braking.

[0064] In one solution of this embodiment, two sets of brake assemblies are installed, one set of brake assemblies is the first brake assembly with a braking torque of F1, and the other set of brake assemblies is the second brake assembly with a braking torque...

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PUM

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Abstract

The invention discloses a railway vehicle traction and braking system and method. The method is based on the system. The system comprises a motor which rotates and generates torque to provide tractionforce for traction of a railway vehicle and rotates and generates torque to provide braking force for braking of the railway vehicle, a position sensor which is installed on a motor shaft, has a signal end connected with a traction converter and is used for collecting position information of the motor and transmitting the position information to the traction converter, and the traction converterwhich is connected with a power supply, the motor and the position sensor and is used for outputting a three-phase power supply after being connected to a main power supply for adjustment, receiving the position information of the motor acquired by the position sensor, calculating the rotating speed and the acceleration of the motor according to the position information of the motor, calculating the rotating speed of the magnetic field according to the rotating speed of the motor, the slip ratio corresponding to the current working condition of the motor and the target torque, and adjusting the current, voltage and frequency of the output three-phase power supply according to the rotating speed of the magnetic field and the target torque to enable the motor to generate stable and controllable braking torque at low speed and zero speed.

Description

technical field [0001] The invention belongs to the technical field of rail vehicle electronic power, and in particular relates to a rail vehicle traction and braking system and method. Background technique [0002] With the development of our country's economy, the modernization of cities is getting higher and higher, and people's travel is becoming more and more convenient. The distribution of rail transit in the country is becoming wider and wider, and the rail transit with a wider coverage makes people travel more and more convenient. Currently, subways and trains are mostly used in rail transit. The traction and braking system is an important part of rail transit, which is used to realize the movement control of the vehicle. In the current traction braking system, when traction, the traction force moves forward, the wheels rotate in the forward direction, and the motor generates forward positive thrust. When braking, the wheel moves forward and the braking force moves...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/20B60L15/00B60L1/00B60L3/00B61C9/50
CPCB60L1/00B60L3/0046B60L15/007B60L15/2009B60L2200/26B60L2240/421B60L2240/423B61C9/50Y02T10/72
Inventor 涂光炜曾鉴王选民
Owner 成都图翎新能源科技有限公司