CN201792875U - Safe joint structure of three-phase alternating current switch machine - Google Patents
Safe joint structure of three-phase alternating current switch machine Download PDFInfo
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- CN201792875U CN201792875U CN2010202751958U CN201020275195U CN201792875U CN 201792875 U CN201792875 U CN 201792875U CN 2010202751958 U CN2010202751958 U CN 2010202751958U CN 201020275195 U CN201020275195 U CN 201020275195U CN 201792875 U CN201792875 U CN 201792875U
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- switch machine
- phase
- safe
- safety contact
- alternating current
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Abstract
The utility model discloses a safe joint structure of a three-phase alternating current switch machine. Safe joints of the three-phase alternating current switch machine are arranged into two groups are respectively connected in two-phase windings of a three-phase motor in the switch machine in series, the windings connected with one group of safe joints in series is sheared with a switch machine representation loop, simultaneously a safe joint special resistance is additionally arranged on the group of safe joints and parallelly connected together with the safe joints in the same group, and the resistance value of the safe joint special resistance is equal to 150 ohms. The safe joint structure of the three-phase alternating current switch machine can thoroughly eliminate broken phase action of the motor in the three-phase alternating current switch machine, and guarantees driving safety and personal safety of maintenance personnel for maintaining the switch machine.
Description
Technical field:
The utility model belongs to the communications and transportation railway signal automatic control system, relates in particular to safety contact (promptly the interdicting contact) structure of three phase current point switch.
Background technology:
Because railway transportation has adopted the three-phase alternating current turn-out track equipment in a large number; safety when guaranteeing that the maintainer safeguards switch machine; after requiring the safety contact switch disconnection of switch machine; even signal tower maloperation track switch testing circuit; switch machine can not move yet; this is a kind of protection to the maintainer, is the thought design-calculated of following fault-safety principle.
The safety contact of three phase current point switch has only one group at present, is serially connected in the phase winding of switch machine three-phase motor.When three phase current point switch is used on big iron, disconnect safety contact (disconnecting the phase in the motor circuit) back to electrical motor power supply test, electrical motor does not move phenomenon; And when being applied in subway, because the command range of subway is generally shorter, the load of electrical motor three phase windings is less, disconnects safety contact (promptly disconnecting electrical motor one phase) with this understanding, and some switch machine of energising back still can move, and its major cause is:
1: when stator coils of motor leads to three-phase electricity, produce rotating field, the rotating field that the stator coil energising produces acts on rotor, and rotor is rotated under the effect of electromagnetic torque; When the phase time that breaks, in the ideal case, stator winding does not produce rotating field, and the generation pulsating magnetic field, and can be decomposed into the opposite rotating field of positive and negative both direction, two torques that the opposite rotating field of hand of rotation produces positive and negative both direction, major part is cancelled out each other, it is a lot of that motor starting moment is reduced, and do not overcome starting resistance, so fail to start.
Above-mentioned for ideally, and actual electrical motor manufacturing and use in can occur and the inconsistent situation of ideal conditions, thereby cause electrical motor can start at the phase time that breaks.
When the electrical motor phase time that breaks, the influence factor of all the other two-phases is mainly:
(1) stator core is laid the angle precision of winding fluting (differing 120 degree between groove), the winding number of turn of stator winding; The discharging precision of rotor core bare conductor etc. as angle precision and discharge inhomogeneously, will cause the difference of electromagnetic torque.Setting accuracy also can exert an influence in addition.
(2) because there is difference in the numerical value of three phase supply voltage, break one mutually after, all the other two phase voltages also can influence the electromagnetic torque that is produced if any certain difference.
2: small power motor (below the 2000W) because the starting resistance of rotor is smaller, when logical two-phase was electric, the electromagnetic torque difference of positive and negative two directions can overcome the required moment of rotor starting fully, therefore started easily.
Comprehensive above two, owing to be difficult to accomplish ideal state in the actual production, when switch machine was used on big iron, command range was longer, and the load of electrical motor three phase windings is bigger, more than two reasons can not cause electrical motor to break one still moving after mutually; And switch machine is when being applied in subway, and command range is shorter, and the load of three phase windings is less, break at electrical motor under the influence of above two reasons and one still can move after mutually, thus entail dangers to traffic safety and switch machine maintainer's personal safety.
Summary of the invention:
The purpose of this utility model is thoroughly to eliminate electrical motor phase failure action phenomenon in the three phase current point switch, guarantees the personal safety when traffic safety and maintainer safeguard switch machine.
Three-Phase Asynchronous is: when the three-phase alternating current, the resultant magnetic field of generation is big or small unmodified space rotating magnetic field in the electrical motor three-phase symmetric winding, rotates after making rotor produce electric current; What the electrical motor three-phase symmetric winding produced during by biphase current is pulsating magnetic field, can be decomposed into the rotating field of positive and negative both direction, when balance is broken by certain factor, rotor is rotated; When the electrical motor three-phase symmetric winding when the phase current, can not produce rotating field, rotor can't cutting magnetic line and produce electric current, therefore can't rotate.
According to above Three-Phase Asynchronous, as long as just can thoroughly guaranteeing electrical motor, its work magnetic field of elimination is failure to actuate, promptly disconnect the two-phase of electrical motor.But for switch machine, because the expression loop and the three-phase motor loop of switch machine are shared, if disconnection two-phase, motor circuit disconnects, the expression loop also disconnects, and makes control cabin can not receive switch indication, and switch machine is when being applied in subway, the control system of subway requires to disconnect safety contact still will have the expression signal in the control cabin later on, needs also therefore to guarantee that the expression loop is not disconnected.
The technical solution of the utility model is as follows: the safety contact of three phase current point switch is two groups, respectively in two phase windings of series connection three-phase motor in described switch machine; Wherein one group of winding that safety contact was connected in series and switch machine indication loop are shared, and this group safety contact installs the safety contact special resistors simultaneously additional; Described safety contact special resistors and safety contact on the same group are connected in parallel; The resistance of safety contact special resistors equals 150 ohm.
Advantage and the good effect that the utlity model has are: owing to adopt technique scheme, after two groups of safety contacts all disconnect, the safety contact special resistors is by the entry loop of connecting, the expression loop is not disconnected, if continue to the electrical motor power supply, because of the safe resistance of series connection in the loop, load strengthens, the motor start-up electric current will reduce greatly, so switch machine can not move after disconnecting safety contact, guarantee the personal safety when traffic safety and maintainer safeguard switch machine.
Description of drawings:
Fig. 1 is the inner diagram of wiring of ZDJ9 switch machine
Wherein: K01, K02 are first group of safety contacts;
K03, K04 are second group of safety contacts;
R is the safety contact special resistors;
W, V, U are electrical motor three phase windings.
The specific embodiment:
With the ZDJ9 switch machine is example, and former ZDJ9 switch machine has only one group of safety contact, and series connection in the electrical motor V phase winding, safety contact disconnection back electrical motor can take place when subway is used still have the action phenomenon in switch machine.
Make amendment according to the utility model, as shown in Figure 1, safety contact group K01, K02 series connection are in switch machine in the electrical motor V phase winding, safety contact group K03, K04 series connection are in electrical motor W phase winding, and the W phase winding is shared with the expression loop, adopt 150 ohmages as safety contact special resistors R, be connected in parallel with safety contact group K03, K04.
After two groups of safety contacts all disconnect, electrical motor V disconnects mutually, and the W entry loop because safety contact special resistors R is connected mutually, the switch machine indication loop can not be disconnected, if power to electrical motor this moment, because the existence of safety contact special resistors R in the loop, greatly reduce the starting current of electrical motor, so switch machine can not move phenomenon.
More than an embodiment of the present utility model is had been described in detail, but described content only is preferred embodiment of the present utility model, can not be considered to be used to limit practical range of the present utility model.All equalizations of doing according to the utility model application range change and improve etc., all should still belong within the patent covering scope of the present utility model.
Claims (1)
1. the safety contact structure of a three phase current point switch, it is characterized in that: the safety contact of described three phase current point switch is two groups, respectively in two phase windings of series connection three-phase motor in described switch machine; Wherein one group of winding that safety contact was connected in series and switch machine indication loop are shared, and this group safety contact installs the safety contact special resistors simultaneously additional; Described safety contact special resistors and safety contact on the same group are connected in parallel; The resistance of described safety contact special resistors equals 150 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202751958U CN201792875U (en) | 2010-07-29 | 2010-07-29 | Safe joint structure of three-phase alternating current switch machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202751958U CN201792875U (en) | 2010-07-29 | 2010-07-29 | Safe joint structure of three-phase alternating current switch machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201792875U true CN201792875U (en) | 2011-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202751958U Expired - Lifetime CN201792875U (en) | 2010-07-29 | 2010-07-29 | Safe joint structure of three-phase alternating current switch machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201792875U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325995A (en) * | 2014-10-31 | 2015-02-04 | 西安交通大学 | Planetary reduction type switch machine driven by inner alternating current servo synchronous motor |
-
2010
- 2010-07-29 CN CN2010202751958U patent/CN201792875U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325995A (en) * | 2014-10-31 | 2015-02-04 | 西安交通大学 | Planetary reduction type switch machine driven by inner alternating current servo synchronous motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: TIANJIN RAILWAY SIGNAL CO., LTD. Free format text: FORMER NAME: TIANJIN RAILWAY SIGNAL FACTORY |
|
| CP03 | Change of name, title or address |
Address after: 300300 Tianjin city Dongli District Road No. 1199 a Patentee after: Tianjin Railway Signal Co., Ltd. Address before: 300300 No. 1, Tianjin Road, Dongli, China Patentee before: Tianjin Railway Signal Factory |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110413 |
|
| CX01 | Expiry of patent term |