CN87215144U - Choked starter for electric motors - Google Patents
Choked starter for electric motors Download PDFInfo
- Publication number
- CN87215144U CN87215144U CN 87215144 CN87215144U CN87215144U CN 87215144 U CN87215144 U CN 87215144U CN 87215144 CN87215144 CN 87215144 CN 87215144 U CN87215144 U CN 87215144U CN 87215144 U CN87215144 U CN 87215144U
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- CN
- China
- Prior art keywords
- starting
- starter
- current
- electric
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Motor And Converter Starters (AREA)
Abstract
The utility model discloses a choked starter for electric motors, comprising a starting switch K-[1], a run switch K-[2], and a negative temperature coefficient thermistor which has the function of limiting the current. The starter can efficiently limit the starting current of the electric motor, the electric power can no be consumed on the current-limiting resistor, and the starting torque of the electric motor can not be reduced. The choked starter for electric motors can prevent the insulating coat of the windings of the electric motor from the thermal deterioration of the starting current, the starting energy consumption can be lowered, the service life of the electric motor can be extended by 3-5 times, and the starting electric consumption can be saved by 50%. The utility model has the advantages of simple structure, high reliability, and convenient operation.
Description
The utility model relates to starting device of motor.
AC asynchronous motor and DC motor that Electric Traction is commonly used, when direct-on-line starting, the electric current in the motor windings is six to ten times of rated current, very the person reaches tens of times.Even if serial connection reactance or resistance, when connecing reduced voltage starting such as autotransformer, y-△ conversion, starting current still is about 25 times of its rated current, this not only wastes electric energy, the insulation property of winding are wrecked, also to cause the voltage drop that power transmission network is very big, have a strong impact on the normal operation of other electric equipment.Reduced voltage starting also exists the starting device complexity, reduces the weak point of electric motor starting torque.
The purpose of this utility model is to design a kind of motor chokes starter, to overcome the deficiencies in the prior art.
Technical characterstic of the present utility model is, with choked flow elements such as the reactance that plays metering function in the alternative existing starting device of custom-designed negative temperature coefficient thermistor, resistance, autotransformers.
Below in conjunction with drawings and Examples the utility model is explained.
Fig. 1, Fig. 2 have pointed out architectural feature of the present utility model.As seen from the figure, the utility model removes has with the identical starting switch K of existing technology
1With run switch K
2Outward, with K switch
2Two tip side parallel connections in each phase current line negative temperature coefficient thermistor (1).Obviously, work as K switch
2When not closed, resistor (1) is serially connected in the power line.
The course of work of the present utility model and principle are such: starting switch K closes
1(this moment K
2Not closed) time, source current enters motor windings through thermistor (1); At the initial time of starting, though motor windings no current and impedance is very little because thermistor (1) is serially connected in the circuit, plays choking effect, entire circuit has big resistance, and electric current can only steadily enter motor windings; Afterwards, the winding reactance increases, and thermistor (1) reduces because of its negative temperature coefficient feature resistance, and entire circuit is still keeping stablizing resistance, has limited starting current.After finishing starting process, run switch K closes
2, resistor (1) is quit work by short circuit, and motor enters normal course of operation.
Negative temperature coefficient thermistor (1) can be designed to the mounting structure identical with existing resistance as required, and wherein a kind of preferable structure as shown in Figure 3.As shown in Figure 3, thermistor (1) is the garden annular, and both ends of the surface have silver-plated electrode (2), and the conducting strip (3) of band connection bolt (4) is arranged on it, and conducting strip (3) lining is fixing with fastening bolt (6) with insulation spacer (5) back.
30 kilowatts of three-phase AC of When one asynchronous motor is installed the utility model, 10 kilowatts of each is gone here and there the power of thermistor (1) of usefulness mutually and is not less than, bear maximum operating currenbt and be not less than 27 amperes, 25 ℃ of of of is 15～30 ohm of the resistance value in the time of, and (K closes during excision2The time) resistance is 0.5～0.3 ohm, action response time is 2 seconds.The external diameter of annular heat sensitive resistor (1) is 120 millimeters, and internal diameter is 80 millimeters, and thickness (both ends of the surface distance) is 10 millimeters.
The utility model can limit starting current when motor starting, reduce resistance value voluntarily behind the starting initial time, does not make power consumption on current-limiting resistance, thereby has played current limliting and energy-conserving action.More existing starting device can reduce the starting energy consumption more than 50%, prolongs 3 to 5 times of motor life-spans.The utility model also has simple in structure, the characteristics of dependable performance.
Description of drawings:
Fig. 1 is an AC motor starter, Fig. 2 be DC motor starting from, Fig. 3 is the mounting structure of thermistor (1).In the drawings:
1---negative temperature coefficient thermistor
2---silver-plated electrode
3---conducting strip
4---connection bolt
5---insulation spacer
6---fastening bolt
Claims (2)
1, a kind of motor chokes starter comprises starting switch K
1With run switch K
2, feature of the present utility model is, with K switch
2Two tip side parallel connections in each phase power line negative temperature coefficient thermistor (1).
2, motor chokes starter according to claim 1, it is characterized in that, the both ends of the surface of described thermistor (1) have silver-plated electrode (2), and the conducting strip (3) of band connection bolt (4) is arranged on it, and conducting strip (3) lining is fixing with fastening bolt (6) with insulation spacer (5) back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87215144 CN87215144U (en) | 1987-12-05 | 1987-12-05 | Choked starter for electric motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87215144 CN87215144U (en) | 1987-12-05 | 1987-12-05 | Choked starter for electric motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87215144U true CN87215144U (en) | 1988-09-07 |
Family
ID=4829323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87215144 Withdrawn CN87215144U (en) | 1987-12-05 | 1987-12-05 | Choked starter for electric motors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87215144U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499749B (en) * | 2009-02-24 | 2012-05-30 | 山东精久科技有限公司 | Slow starting control circuit for DC motor |
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
-
1987
- 1987-12-05 CN CN 87215144 patent/CN87215144U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499749B (en) * | 2009-02-24 | 2012-05-30 | 山东精久科技有限公司 | Slow starting control circuit for DC motor |
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |