CN2711984Y - Solid state starter for high and intermediate voltage ac motor - Google Patents
Solid state starter for high and intermediate voltage ac motor Download PDFInfo
- Publication number
- CN2711984Y CN2711984Y CN 200420064918 CN200420064918U CN2711984Y CN 2711984 Y CN2711984 Y CN 2711984Y CN 200420064918 CN200420064918 CN 200420064918 CN 200420064918 U CN200420064918 U CN 200420064918U CN 2711984 Y CN2711984 Y CN 2711984Y
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- solid state
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- thermistor
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Abstract
The utility model discloses a solid state soft starter for a high and intermediate voltage ac motor having large power, which is characterized in that three NTC type solid state thermistors (2) are respectively connected in series between a three-phase power supply and a three-phase stator winding of an electric motor (1). Both ends of each phase of the solid state thermistor (2) are connected with a vacuum circuit breaker (3) through a secondary control circuit. The solid state thermistor of the utility model is made into the power, directly-heated and NTC type thermistor by adopting the oxide semiconductor material of transition metals through the high sintering. The utility model can convert the current into the function of the power, convert the power into the function of the temperature and convert the temperature into the function of the time through utilizing the consumption of the resistance, consequently realize to decrease the starting current when the electric motor starts and achieve the action of electrodeless continuous reduced voltage starting. The utility model has the characteristics of simple structure, small volume, easy installation, low cost, free maintenance, no generation of any pollution to the distribution network, etc.
Description
Affiliated technical field
The utility model relates to a kind of employed solid state heat sensitive resistor of mesohigh high power AC motor solid soft start and connection line thereof.A kind of specifically mesohigh alternating current motor solid soft start device.
Background technology
Starting current was big when the across-the-line starting of mesohigh high power AC motor was direct-on-line starting; generally be rated current 4-7 doubly; produce bigger pressure drop in distribution system; influence is with the operation of other power consumption equipment of bus; for example protection system misoperation; precision instrument can not move, degradation under the processed product quality.Excessive starting torque also can produce huge impact to motor and gearing, the damage of the aging and machinery of acceleration motor.Therefore, general high power motor need adopt the reduced voltage starting method to reduce starting current.
Traditional reduced voltage starting method such as auto-induction voltage-reduced starting and the starting of Y/ Δ, equipment is simple, and is easy to maintenance, but belong to requirement and the load variations needs that have grade step-down can not take into account electric power system.
More popular flexible starter for electric motor is a thyristor control motor soft start device at present, and this class soft starter device is made up of microprocessor controller and thyristor electronic switching element.Send the control that trigger impulse is added to thyristor by microprocessor controller and extremely go up, the angle of flow of control thyristor makes the voltage of motor controlled.This control forms soft starter device produces current harmonics, power distribution network is produced pollute.Cost is higher.Bearing voltage and being subjected to manufacture level by current capacity of thyristor limits, the high voltage and high power electromotor starting device must be realized with a plurality of thyristor connection in series-parallel, technical sophistication, reliability is reduced, increased maintenance workload, so present more application is in the soft start of low pressure, middle low power motor.
To the soft start of high voltage and high power electromotor, adopted liquid resistance soft starter device it is the method realization soft start of adjusting liquid resistance with control pole plate distance in the past.This soft start has is convenient to control the advantage low with cost.But exist floor space big, difficult in maintenance.Motor is Fraquent start continuously; When liquid is placed for a long time in addition, be easy to evaporation, must regular liquid make-up, thus increased shortcoming such as maintenance workload.
Summary of the invention
The utility model provides a kind of mesohigh alternating current motor solid soft start device, many shortcomings of liquid resistance soft start have been overcome, can be in the stipulated time of motor starting, finish thermistor and change temperature funtion into by time t, be the resistance value function by temperature transition again, electric resistance changing is the function of starting current, and is simple in structure, easy for installation, starting process is level and smooth, can not produce any pollution to power distribution network simultaneously.
The technical scheme that the utility model adopted is: adopt the transition metal oxide semi-conducting material, burn clean by high temperature, manufacture power-type, directly-heated type, NTC type resistor, utilize the temperature characterisitic of transition metal oxide semi-conducting material, realize that the functional relation of temperature and resistance is R
T=F (T) (R
TThermistor, T: temperature), thermistor one end is connected to three phase mains, the other end of thermistor is connected in motor, connect vacuum circuit-breaker at two ends of thermistor, control the startup and the operation of motor by secondary control loop, when motor start-up, power supply is delivered to motor by the step-down of NTC type thermistor, and the resistance value of thermistor is by R
T25(resistance value of thermistor in the time of 25 ℃ Celsius) is reduced to 0.1R
T25, and motor speed sharply increases, and starts to finish the final vacuum circuit breaker is promptly realized switch by the time-delay control circuit of secondary circuit closure, and motor enters normal operation.
Description of drawings
Accompanying drawing is solid-state three-phase alternating-current motor starting circuit principle assumption diagram.
Embodiment:
NTC type thermistor (2) is connected with the three phase mains circuit with motor (1) stator winding respectively, and vacuum circuit-breaker (3) is connected to NTC themistor (2) two ends, is making NTC type thermistor R
TThe time, according to starting current, rated voltage, starting torque and the loading condition thereof of motor, the use power of control thermistor can make starting from motor to normal operation, and the temperature of NTC type thermistor rises to R from normal temperature
TCeiling temperature, and resistance is from R
T25Sharply change to 0.1R continuously
T25If the needs from start to finishing of motor 60 seconds, then resistor just can make R in 60 seconds time
TTemperature sharply be increased to uniform temperature, so since thermistor be the R of power-type, directly-heated type, NTC type resistance value
TThen from R
T25Resistance value ease down to 0.1R continuously
T25The time resistance value, utilize the consumption of electric current at resistance, can be the function of power with current transitions just, by the control and the calculating of production technology, just power can be changed into the function of temperature, temperature transition is the function of time, realize reducing starting current in the motor starting procedure, gradually reduce R
TResistance value, the speed of motor improves gradually, to reach stably electrodeless continuous reduced voltage starting effect.
Claims (2)
1, a kind of mesohigh alternating current motor solid soft start device, it is characterized in that: three NTC type solid state heat sensitive resistors (2) are serially connected with respectively between the threephase stator winding of three phase mains and motor (1), and the two ends of every phase solid state heat sensitive resistor (2) connect a vacuum circuit-breaker (3) by secondary control loop.
2, mesohigh alternating current motor solid soft start device according to claim 1 is characterized in that: NTC type solid state heat sensitive resistor (2) be utilize that the transition metal oxide semi-conducting material produces be power-type, directly-heated type, NTC type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420064918 CN2711984Y (en) | 2004-06-12 | 2004-06-12 | Solid state starter for high and intermediate voltage ac motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420064918 CN2711984Y (en) | 2004-06-12 | 2004-06-12 | Solid state starter for high and intermediate voltage ac motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2711984Y true CN2711984Y (en) | 2005-07-20 |
Family
ID=36193083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420064918 Expired - Fee Related CN2711984Y (en) | 2004-06-12 | 2004-06-12 | Solid state starter for high and intermediate voltage ac motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2711984Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150364976A1 (en) * | 2014-06-13 | 2015-12-17 | Fanuc Corporation | Overheat detection device for electric motor equipped with multiple ptc thermistors |
| CN111664888A (en) * | 2020-05-15 | 2020-09-15 | 杭州杰牌传动科技有限公司 | Distributed speed reduction motor energy monitoring system and method |
-
2004
- 2004-06-12 CN CN 200420064918 patent/CN2711984Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150364976A1 (en) * | 2014-06-13 | 2015-12-17 | Fanuc Corporation | Overheat detection device for electric motor equipped with multiple ptc thermistors |
| US10018518B2 (en) * | 2014-06-13 | 2018-07-10 | Fanuc Corporation | Overheat detection device for electric motor equipped with multiple PTC thermistors |
| CN111664888A (en) * | 2020-05-15 | 2020-09-15 | 杭州杰牌传动科技有限公司 | Distributed speed reduction motor energy monitoring system and method |
| CN111664888B (en) * | 2020-05-15 | 2022-08-02 | 杭州杰牌传动科技有限公司 | Distributed speed reduction motor energy monitoring system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| C56 | Change in the name or address of the patentee |
Owner name: HUBEI SHIXIANG ELECTRIC SCIENCE CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHIXIANG IND CO LTD, XIANGFAN CITY |
|
| CB03 | Change of inventor or designer information |
Designer after: Yang Jundai Designer after: Cheng Bitao Designer after: Luo Runsheng Designer after: Xu Linfei Designer before: Yang Jundai Designer before: Cheng Bitao Designer before: Luo Runsheng Designer before: Xu Linfei Designer before: He Zhen |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: DESIGNER; FROM: YANG JUN ; CHENG BITAO; LUO RUNSHENG; XU LINFEI; HE ZHEN TO: YANG JUN ; CHENG BITAO; LUO RUNSHENG; XU LINFEI |
|
| CP03 | Change of name, title or address |
Address after: 441003 No. 8 Hanjiang North Road, hi tech Zone, Hubei, Xiangfan Patentee after: Hubei fortune Electric Technology Co., Ltd. Address before: 441002 No. 287 Changhong Road, Hubei, Xiangfan Patentee before: Shixiang Ind Co Ltd, Xiangfan City |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |