CN104348137A - PMSM capacitive time-delay star-sealing loop and star-sealing method - Google Patents
PMSM capacitive time-delay star-sealing loop and star-sealing method Download PDFInfo
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- CN104348137A CN104348137A CN201310312498.0A CN201310312498A CN104348137A CN 104348137 A CN104348137 A CN 104348137A CN 201310312498 A CN201310312498 A CN 201310312498A CN 104348137 A CN104348137 A CN 104348137A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007789 sealing Methods 0.000 title abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 8
- 230000001360 synchronised effect Effects 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000005284 excitation Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 241000272525 Anas platyrhynchos Species 0.000 description 1
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- 238000010891 electric arc Methods 0.000 description 1
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- 238000012163 sequencing technique Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a PMSM capacitive time-delay star-sealing loop and a star-sealing method. The star-sealing loop comprises a controller and a rectifier bridge; the control end of the controller is connected with a power output circuit; an output end of the controller is successively connected with a first output contactor, a first star-sealing contactor and an AC power source; the input end of the rectifier bridge is respectively connected with the AC power source and the output end of the controller, and the output end of the rectifier bridge is connected with a star-sealing contactor; and the two ends of the star-sealing contactor are connected in parallel with resistors and capacitors which are mutually connected in series. The sealing method is as follows: during normal shutdown, the coil of a first output contactor fails to be energized, an output contact is disconnected, the rectifier bridge fails to be energized and has no output, and the coil of the star-sealing contactor maintains for a discharge time period under a capacitor discharge effect and then fails to be energized. According to the invention, through a charge and discharge process of the capacitors, time-delay operation is carried out on the star-sealing contactor in an elevator control cabinet, and even if power suddenly fails in an elevator operation process, a very good time-delay effect can be generated, and thus the contactor, a frequency converter or a tractor can be protected.
Description
Technical field
The present invention relates to elevator safety technical field, particularly relate to a kind of permagnetic synchronous motor electric capacity time delay envelope star method and envelope star loop.
Background technology
In recent years, elevators field has a motor new master---and the permanent magnetic synchronous traction machine that-permagnetic synchronous motor is made, its low-speed big feature makes it just obtain fast development once coming out.According to the short-circuit generator characteristic of permagnetic synchronous motor, electrode coil short circuit, before operation, first can disconnect cutting back loop again by electric wiring when elevator stops ladder, motor can be made when the malfunctioning and elevator of band-type brake slips car, all the time being in very low speed, can not causing the accident because slipping faster and faster.
According to the short-circuit generator characteristic of permagnetic synchronous motor, a lot of Elevator Factory utilizes this characteristic to increase normally closed auxiliary contact on output contactor, the short circuit permagnetic synchronous motor three-phase windings (being commonly called as envelope star) when traction machine power-off, play elevator overspeed or emergency manual to declutch braking action when slipping car rescue, move under making lift car be limited in the synchronous slow-speed of revolution.
The advantage of this electrical design is mathematical, but runs unexpected power-off when elevator is fully loaded at a high speed, and this design is also huge to the risk that permanent-magnet synchnorous gearless dragging machine brings.
First, if two contactors are synchronously bad during contactor action, namely the contactor of short circuit or auxiliary contact also disconnected (due to elevator stops time, the energy in traction machine is also comparatively large, and at this moment short circuit contactor closes and has arcing, or stop during maintenance at ordinary times also can arcing, when causing elevator starter, when short circuit contactor contact disconnects, have the delay of very short time), output contactor is just closed upper, directly cause, frequency converter output short-circuit, causing the damage of frequency converter.
The second, the electrical short circuit winding if envelope star contactor gets on when elevator stops at once, the energy at this moment on winding is also very high, and can cause envelope star contactor contact arc discharge, run frequent, contacts of contactor also can damage in arcing.Above two kinds of situations make the spoilage of permanent magnet motor elevator envelope star contactor quite high.
At present at elevators field, the envelope star method that apparatus for controlling elevator is conventional has four kinds:
As shown in Figure 1, realize sealing star with the auxiliary contact of main contactor KM1, be characterized in that cost is low, control simple.Risk has two, and one is main contactor KM1 main contacts and auxiliary contact action simultaneously, and the slightly advanced main contacts of action of auxiliary contact, just likely causes frequency converter short circuit; Two be the auxiliary contact off-capacity of contactor with the electric current slipped by short circuit during car, contact may be made to damage when dynamic circuit breaker.
As shown in Figure 2, realize sealing star with the contactor KM1 that permanent-magnetic tractor is special, the main contacts of contactor KM1 self has two groups, one group controls frequency converter as main contacts and exports (normally often making war), another group carries normally-closed contact functional realiey envelope star, and the mechanical structure of contactor can ensure that two groups of contacts can not close simultaneously, can ensure that normally-closed contact disconnects rear time delay and connects normally opened contact simultaneously, normally opened contact connects normally-closed contact after disconnecting, and the method reliability is higher.But still short problems when cannot solve instant cut-off.Disconnect in case of the fortuitous events such as power failure are difficult to guarantee two contactors simultaneously, cause the short circuit of traction machine belt speed.
As shown in Figure 3, use one to seal star contactor KM2 and realize sealing star, controlled the sequential relationship of two contactors by elevator controlling mainboard or sequencing control plate.Elevator normal course of operation can ensure not occur security incident, disconnects simultaneously, cause the short circuit of traction machine belt speed in case of the fortuitous events such as power failure are difficult to guarantee two contactors.
As shown in Figure 4, use envelope star contactor KM2 to seal star, main contactor KM1 is Special contactor, and after its dead electricity, main contacts disconnects immediately, and its auxiliary contact deferred action disconnects KM2, realizes the function of time delay envelope star.
The object of above-mentioned four kinds of traction machines " envelope star " method, all to increase lift running safety, it is exactly briefly the characteristic utilizing synchro traction machine to seal star, at elevator internal contracting brake inoperative or embrace dead and cause slipping car time, elevator traction machine can be made to be in dynamic brake state, even if making elevator slip car is also very slow speed (being less than 0.25 meter per second), the personnel in car can not be injured;
But all could not solve following hidden danger very well simultaneously:
(1) seal star when frequency converter has output and all can cause short circuit to frequency converter, likely can damage frequency converter;
(2) seal star when traction machine belt speed all to impact motor, loss of excitation, insulation damages, stator structure are out of shape, magnet steel loss of excitation or the equivalent risk that comes off to cause motor permanent magnet to have, and even control cubicle has to catch fire and causes the risk of machine room fire.(such as, elevator causes the anxious stopping time due to safety return circuit reason, this can often encounter within the use runtime of elevator, in sedan-chair, personnel take off door when elevator high-speed cruising, hit door, and elevator door knife is wiped and touched croquet etc., suddenly when capital causes elevator high-speed cruising stop and motor impacted) by the traction machine of a 6.7kw, ladder speed for 1m/s be example, if inspection speed is 0.3m/s, then during 0.3m/s speed, the electric current of instantaneous short circuit winding can reach 50A, is 3.5 times of rated current.If the traction machine of a 17kw, ladder speed are 2.5m/s, under normal speed, occurred envelope star situation, the short circuit current at once during " envelope star " short circuit can reach 530A, is 14 times of rated current.Line fault, contactor fault, safety return circuit action, power failure, misoperation, all likely cause belt speed to seal the possibility of star.
Summary of the invention
The object of this invention is to provide a kind of permagnetic synchronous motor electric capacity time delay envelope star loop, under any circumstance can both play time-lag action, thus protection contactor, frequency converter or traction machine.
For solving the problems of the technologies described above, the present invention includes controller and rectifier bridge, the control end of described controller is connected with Power output circuit, the output of described controller is connected with AC power with the first output contactor, the first envelope star contactor successively, described rectifier bridge input is connected with the output of controller with AC power respectively, output is connected with envelope star contactor, and described envelope star contactor two ends are parallel with resistance and the electric capacity of series connection mutually.
As a preferred embodiment of the present invention, described Power output circuit comprises interconnective second output contactor and motor, is also provided with the second envelope star contactor between described second output contactor and motor.
As a preferred embodiment of the present invention, described second envelope star contactor is direct current closed type contactor.
As a preferred embodiment of the present invention, described envelope star contactor two ends are also parallel with absorption diode.
For solving the problems of the technologies described above, the present invention also provides a kind of above-mentioned permagnetic synchronous motor synchronous capacitor time delay to seal the envelope star method in star loop, when orderly shutdown, the coil losing electricity of the first output contactor, output contact disconnects, rectifier bridge dead electricity no-output, the coil of envelope star contactor to be subject to after the capacitor discharge effect sustain discharge time dead electricity again.
As a preferred embodiment of the present invention, before orderly shutdown, also comprising AC power by rectifier bridge is the step of capacitor charging.
As a preferred embodiment of the present invention, described discharge time is determined according to the capacitance of electric capacity and the resistance of resistance.
Technique effect of the present invention is the charge and discharge process by electric capacity; to the time delay of elevator envelope star contactor; even if having a power failure suddenly this state when elevator runs; because envelope star contactor is due to the cause of capacitor discharge; can time delay close for about 2 seconds, during this period of time, the energy of traction machine coil can decline a lot; well play delay protection effect, thus protection contactor or frequency converter.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and preferred implementation, the present invention is further detailed explanation.
Fig. 1 is the circuit diagram of the first envelope star method in prior art;
Fig. 2 is the circuit diagram of the second envelope star method in prior art;
Fig. 3 is the circuit diagram of the third envelope star method in prior art;
Fig. 4 is the circuit diagram of the 4th kind of envelope star method in prior art;
Fig. 5 is the circuit diagram sealing star control circuit in the present invention;
Fig. 6 is the circuit diagram of medium power output circuit of the present invention.
Embodiment
As shown in Figure 5, permagnetic synchronous motor electric capacity time delay envelope star loop of the present invention, comprise controller and rectifier bridge, the control end of described controller is connected with Power output circuit, the output of described controller is connected with AC power with the first output contactor, the first envelope star contactor successively, described rectifier bridge input is connected with the output of controller with AC power respectively, output is connected with envelope star contactor, described envelope star contactor two ends are parallel with resistance and the electric capacity of series connection mutually, and described envelope star contactor two ends are also parallel with absorption diode.
As shown in Figure 6, described Power output circuit comprises interconnective second output contactor and motor, is also provided with the second envelope star contactor between described second output contactor and motor.Wherein, the second envelope star contactor is direct current closed type contactor, and main contacts is normally closed, disconnects after energising.Its principle is similar to traditional Power output loop, all after output contactor disconnects, second envelope star contactor closes, permagnetic synchronous motor winding three-phase short circuit, play elevator overspeed or emergency manual to declutch braking action when slipping car rescue, make lift car be limited in the effect of movement under the synchronous slow-speed of revolution.
In traditional envelope star loop, output contactor disconnects and the closed almost action simultaneously of envelope star contactor.Envelope star contactor gets on when elevator stops electrical short circuit winding at once, seals star and all can impact motor, cause motor permanent magnet to have the distortion of loss of excitation, insulation damages, stator structure, magnet steel loss of excitation or the equivalent risk that comes off when traction machine belt speed.
The present invention is controlled by delay capacitor, and after motor stops, time delay about 1-2 seconds is just carried out dead electricity and closed.
Electric capacity delay working step of the present invention is as follows: as shown in Figure 5, when the lead-out terminal Y1 of microcomputer plate controller exports, AC power AC110V is first added in rectifier bridge input, rectifier bridge is made to have direct current to envelope star contactor SW2 coil, envelope star contact disconnects, and DC power supply is charged to electrochemical capacitor C by resistance R simultaneously.
Envelope star contactor SW2 obtain electric after, normally opened contact 13 and 14 closes, and output contactor SW is closed, and main frame exported to by frequency converter, and elevator normally works.
When orderly shutdown, lead-out terminal Y1 disconnects, output contactor SW coil losing electricity, and output contact disconnects.Rectifier bridge also dead electricity exports without direct current.
But now seal the discharge process of coil by electrochemical capacitor C of star contactor SW2, also by a maintenance just dead electricity discharge time, so, envelope star contactor SW2 and output contactor SW always has the time delay of 1-2 second when dead electricity, delay time is determined by the capacity of electrochemical capacitor C and the resistance value of discharge resistance R, only need adjust this two parameters, just can obtain the delay time wanted.
If the elevator dead electricity when elevator high-speed cruising, envelope star contactor SW2 equally can time delay as described above, so serve the effect of protection contactor, frequency converter and traction machine.But this state that has a power failure suddenly when running fast is when occurring, traditional to realize time delay by time-delay relay or software control be like water off a duck's back.
By capacitor charge and discharge process of the present invention; to the time delay of elevator envelope star contactor; even if having a power failure suddenly this state when elevator runs; also well time-lag action can be played; avoid sealing star when traction machine belt speed all to impact motor; motor permanent magnet is caused to have the distortion of loss of excitation, insulation damages, stator structure, magnet steel loss of excitation or the equivalent risk that comes off, thus protection contactor or permanent magnetic synchronous traction machine.
Below the preferred embodiment of the invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent modification or replacement under the prerequisite without prejudice to the invention spirit, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (7)
1. permagnetic synchronous motor electric capacity time delay envelope star loop, comprise controller and rectifier bridge, the control end of described controller is connected with Power output circuit, it is characterized in that, the output of described controller is connected with AC power with the first output contactor, the first envelope star contactor successively, described rectifier bridge input is connected with the output of controller with AC power respectively, and output is connected with envelope star contactor, and described envelope star contactor two ends are parallel with resistance and the electric capacity of series connection mutually.
2. permagnetic synchronous motor electric capacity time delay envelope star loop as claimed in claim 1, it is characterized in that, described Power output circuit comprises interconnective second output contactor and motor, is also provided with the second envelope star contactor between described second output contactor and motor.
3. permagnetic synchronous motor electric capacity time delay envelope star loop as claimed in claim 2, it is characterized in that, described second envelope star contactor is direct current closed type contactor.
4. permagnetic synchronous motor electric capacity time delay envelope star loop as claimed in claim 1, it is characterized in that, described envelope star contactor two ends are also parallel with absorption diode.
5. use the envelope star method in the permagnetic synchronous motor synchronous capacitor time delay envelope star loop as described in claim arbitrary in claim 1-4, it is characterized in that, when orderly shutdown, the coil losing electricity of the first output contactor, output contact disconnects, rectifier bridge dead electricity no-output, the coil of envelope star contactor to be subject to after the capacitor discharge effect sustain discharge time dead electricity again.
6. envelope star method as claimed in claim 5, it is characterized in that, before orderly shutdown, also comprising AC power by rectifier bridge is the step of capacitor charging.
7. envelope star method as claimed in claim 5, it is characterized in that, described discharge time is determined according to the capacitance of electric capacity and the resistance of resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310312498.0A CN104348137A (en) | 2013-07-23 | 2013-07-23 | PMSM capacitive time-delay star-sealing loop and star-sealing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310312498.0A CN104348137A (en) | 2013-07-23 | 2013-07-23 | PMSM capacitive time-delay star-sealing loop and star-sealing method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712644A (en) * | 2017-03-14 | 2017-05-24 | 无锡英威腾电梯控制技术有限公司 | Star-sealing loop of permanent-magnet synchronous motor, protection method and frequency converter thereof |
| CN110127486A (en) * | 2018-02-02 | 2019-08-16 | 蒂森克虏伯电梯（上海）有限公司 | Protection method and protection system for accidental movement of elevator car |
| CN110255322A (en) * | 2019-07-04 | 2019-09-20 | 快意电梯股份有限公司 | Elevator seals star system |
| CN112491303A (en) * | 2019-09-11 | 2021-03-12 | 九江精密测试技术研究所 | Brushless torque motor braking device |
| CN115490103A (en) * | 2022-10-25 | 2022-12-20 | 菱王电梯有限公司 | Star sealing control method and device |
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2013
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Non-Patent Citations (1)
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712644A (en) * | 2017-03-14 | 2017-05-24 | 无锡英威腾电梯控制技术有限公司 | Star-sealing loop of permanent-magnet synchronous motor, protection method and frequency converter thereof |
| CN110127486A (en) * | 2018-02-02 | 2019-08-16 | 蒂森克虏伯电梯（上海）有限公司 | Protection method and protection system for accidental movement of elevator car |
| CN110127486B (en) * | 2018-02-02 | 2025-01-21 | 蒂升电梯(上海)有限公司 | Elevator car accidental movement protection method and protection system |
| CN110255322A (en) * | 2019-07-04 | 2019-09-20 | 快意电梯股份有限公司 | Elevator seals star system |
| CN110255322B (en) * | 2019-07-04 | 2024-05-14 | 快意电梯股份有限公司 | Elevator star sealing system |
| CN112491303A (en) * | 2019-09-11 | 2021-03-12 | 九江精密测试技术研究所 | Brushless torque motor braking device |
| CN115490103A (en) * | 2022-10-25 | 2022-12-20 | 菱王电梯有限公司 | Star sealing control method and device |
| CN115490103B (en) * | 2022-10-25 | 2023-11-28 | 菱王电梯有限公司 | Star sealing control method and device |
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