CN105356418A - Wiring error prevention device and method for single-phase AC three-speed motor - Google Patents
Wiring error prevention device and method for single-phase AC three-speed motor Download PDFInfo
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- CN105356418A CN105356418A CN201510687969.5A CN201510687969A CN105356418A CN 105356418 A CN105356418 A CN 105356418A CN 201510687969 A CN201510687969 A CN 201510687969A CN 105356418 A CN105356418 A CN 105356418A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
- H02H7/0844—Fail safe control, e.g. by comparing control signal and controlled current, isolating motor on commutation error
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
Abstract
The invention provides a wiring error prevention device and method for a single-phase AC three-speed motor. The device comprises a motor terminal block, a temperature controller terminal block, a first relay, a second relay and a third relay, wherein the motor terminal block is connected with the single-phase AC three-speed motor; the temperature controller terminal block is connected with an external single-phase AC power supply through a temperature controller; the first relay, the second relay and the third relay constitute a protective logic loop and are connected between the motor terminal block and the temperature controller terminal block; where a wiring error occurs, the protective logic loop can disconnect all the first relay, the second relay and the third relay, thereby avoiding motor erroneous operation which causes rise of voltage and damages the single-phase AC three-speed motor.The device can be used for protecting the motor and preventing the motor from being burnt out in the case of a wiring error. The device not only can be applied to the fan-coil unit of a central air conditioner but also can be widely used for wiring error prevention for the single-phase AC three-speed motor.
Description
Technical field
The present invention relates to motor guard technology, be specifically related to a kind of wiring error protector for single phase alternating current (A.C.) three-speed motor and method, belong to technical field of electricity.
Technical background
Current much equipment adopts single phase alternating current (A.C.) three-speed motor (220V ± 10%/50Hz), and the fan coil units overwhelming majority of such as central air-conditioning adopts single phase alternating current (A.C.) three-speed motor.Refer to Fig. 1, the coil of described single phase alternating current (A.C.) three-speed motor M is made up of main coil L0 and three secondary coil L1, L2, L3, be provided with three fast taps between three secondary coil L1, L2 and L3 to be connected with Terminal of motor platform PM, they are connected with the high speed terminals of Terminal of motor platform PM by red line R, are connected and pass through black line BA be connected with the low speed terminals of Terminal of motor platform PM by blue line BU with the middling speed terminals of Terminal of motor platform PM respectively.During normal work, the zero line terminals connecting the Terminal of motor platform PM of external power source zero line must be connected with the zero line (one end of main coil L0) of motor M by yellow line Y.Be below the operation principle of single phase alternating current (A.C.) three-speed motor M:
1) when single phase alternating current (A.C.) three-speed motor M runs top gear, external power source live wire connects the high speed terminals of Terminal of motor platform PM, and now between yellow line Y and red line R, voltage is 220V;
2) when single phase alternating current (A.C.) three-speed motor M runs mid ranger, external power source live wire connects the middling speed terminals of Terminal of motor platform PM, i.e. 220V/50Hz between yellow line Y and blue line BU;
3) when single phase alternating current (A.C.) three-speed motor M runs low or first gear, external power source live wire connects the low speed terminals of Terminal of motor platform PM, i.e. 220V/50Hz between yellow line Y and black line BA.
When single-phase 220V/50Hz alternating current accesses the single phase alternating current (A.C.) three-speed motor M of fan coil units by thermostat TC, see Fig. 2, thermostat TC judges according to the difference between indoor temperature and design temperature, controls motor M manually or automatically and operates in top gear, mid ranger or low or first gear.
But, the main coil L0 of single phase alternating current (A.C.) three-speed motor M and the structures shape of three secondary coil L1, L2, L3: even if when single phase alternating current (A.C.) three-speed motor M is normally operated in certain rotating speed gear, still have voltage difference between other rotating speed gear and zero line (yellow line Y), its principle producing voltage difference is identical with the operation principle of transformer.For YSK-16-4A single phase alternating current (A.C.) three-speed motor, in table 1 and Fig. 2:
1) when the voltage between the zero line terminals (yellow line Y) and high speed terminals (red line R) of Terminal of motor platform PM is 220V, coil turn (L0+L1) between Huang-blue line (Y-BU) and the coil turn (L0+L1+L2) between Huang-black line (Y-BA) are all more than the coil turn (L0) between Huang-red line (Y-R), so be equivalent to boosting, therefore the voltage > 220V between Huang-blue line (Y-BU), the voltage > 220V in like manner between Huang-black line (Y-BA);
Table 1
2) when the voltage between the zero line terminals (yellow line Y) and middling speed terminals (blue line BU) of Terminal of motor platform PM is 220V, coil turn (L0) between Huang-red line (Y-R) is less than the coil turn (L0+L1) between Huang-blue line (Y-BU), so be equivalent to step-down, the voltage < 220V between Huang-red line (Y-R); Coil turn (L0+L1+L2) between Huang-black line (Y-BA) is more than the coil turn (L0+L1) between Huang-blue line (Y-BU), so be equivalent to boosting, the voltage > 220V between Huang-black line (Y-BA);
3) when the voltage between the zero line terminals (yellow line Y) and low speed terminals (black line BA) of Terminal of motor platform PM is 220V, coil turn (L0+L1) between Huang-blue line (Y-BU) and the coil turn (L0) between Huang-red line (Y-R) are all less than the coil turn (L0+L1+L2) between Huang-black line (Y-BA), so be equivalent to step-down, therefore the voltage < 220V between Huang-blue line (Y-BU), the voltage < 220V in like manner between Huang-red line (Y-R).
After correct wiring, the voltage between each rotating speed gear and zero line all belongs to normal range (NR), so single phase alternating current (A.C.) three-speed motor M normally works.
But because the level of installation personnel is uneven, be subject to again that on-the-spot circuit is many, cabling is complicated, with the impact of the factor such as power supply distance, often there will be wrong zero line and cause burning the situation of single phase alternating current (A.C.) three-speed motor M.The situation of motor external power cord wiring error has 18 kinds, and for YSK-16-4A single phase alternating current (A.C.) three-speed motor, the situation of part line mistake and the abnormal voltage that causes and motor abnormality running is in table 2.
Wiring error can cause the voltage between each rotating speed gear and zero line (yellow line Y) to raise immediately, more than 400V even close to 700V, considerably beyond the permission voltage range of 220V/50Hz single phase alternating current (A.C.) three-speed motor M.Rotating speed occurs very fast in the single phase alternating current (A.C.) three-speed motor M short time, coil temperature sharply rises, and exceedes the temperature resistant grade of coil varnish envelope curve after a few minutes, destroys the insulation of enamelled wire, thus causes coil short, until burn motor, even cause fire.So outside zero line must access the zero line terminals (yellow line Y) of single phase alternating current (A.C.) three-speed motor M, thus once there is wiring error, the protection question of single phase alternating current (A.C.) three-speed motor M just becomes great problem.
Table 2
Summary of the invention
The object of the invention is to; solve the protection question of single phase alternating current (A.C.) three-speed motor when there is wiring error; a kind of wiring error protector for single phase alternating current (A.C.) three-speed motor and method are provided; the relay protective scheme circuit be made up of relay is accessed between single phase alternating current (A.C.) three-speed motor and external power source wiring; when power line wiring is correct; relay can normally work; then motor runs well; if during power line wiring error; relay cisco unity malfunction; then motor does not operate, thus the effect reaching protection motor, prevent motor from burning.
For achieving the above object, technical solution of the present invention is as follows:
For a wiring error protector for single phase alternating current (A.C.) three-speed motor, comprise Terminal of motor platform, thermostat terminal board, the first relay, the second relay and the 3rd relay; Described Terminal of motor platform is connected with described single phase alternating current (A.C.) three-speed motor, include zero line terminals, low speed terminals, middling speed terminals and high speed terminals, described thermostat terminal board is connected with outside single phase alternating current power supply by thermostat, include fire line terminal, zero terminal, low speed terminal, middling speed terminal and high-speed terminal, described first relay, the second relay and the 3rd relay form relay protective scheme loop and are connected between described Terminal of motor platform and thermostat terminal board; When wiring makes a mistake, described relay protective scheme loop can make described first relay, the second relay and the whole open circuit of the 3rd relay, avoids causing voltage to raise, damage the motor error running of described single phase alternating current (A.C.) three-speed motor.
Further, described relay protective scheme loop refers to, the motor coil of described first relay be together in series and the normally closed interlock of described 3rd relay are connected between the high-speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, and the normally open contact of described first relay is connected between the high-speed terminal of described thermostat terminal board and the high speed terminals of described Terminal of motor platform; The motor coil of described second relay be together in series and the normally closed interlock of described first relay are connected between the middling speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, and the normally open contact of described second relay is connected between the middling speed terminal of described thermostat terminal board and the middling speed terminals of described Terminal of motor platform; The motor coil of described 3rd relay be together in series and the normally closed interlock of described second relay are connected between the low speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, and the normally open contact of described 3rd relay is connected between the low speed terminal of described thermostat terminal board and the low speed terminals of described Terminal of motor platform; The zero terminal of described thermostat terminal board is connected with the zero line terminals of described Terminal of motor platform.
Further, the first described relay, the second relay and the 3rd relay are two-way relay.
Another technical scheme of the present invention is:
A kind of means of defence for single phase alternating current (A.C.) three-speed motor wiring error, comprise Terminal of motor platform, thermostat terminal board, the first relay, the second relay and the 3rd relay, described Terminal of motor platform is connected with described single phase alternating current (A.C.) three-speed motor, include zero line terminals, low speed terminals, middling speed terminals and high speed terminals, described thermostat terminal board is connected with outside single phase alternating current power supply by thermostat, includes fire line terminal, zero terminal, low speed terminal, middling speed terminal and high-speed terminal; Described first relay, the second relay and the 3rd relay are connected into relay protective scheme loop according to the following step:
1) normally closed interlock of the motor coil of described first relay and described 3rd relay is together in series, be connected between the high-speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, the normally open contact of described first relay be connected between the high-speed terminal of described thermostat terminal board and the high speed terminals of described Terminal of motor platform;
2) normally closed interlock of the motor coil of described second relay and described first relay is together in series, be connected between the middling speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, the normally open contact of described second relay be connected between the middling speed terminal of described thermostat terminal board and the middling speed terminals of described Terminal of motor platform;
3) motor coil of described 3rd relay and the normally closed interlock of described second relay are together in series, be connected between the low speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, the normally open contact of described 3rd relay is connected between the low speed terminal of described thermostat terminal board and the low speed terminals of described Terminal of motor platform;
4) the zero line terminals of the zero terminal of described thermostat terminal board and described Terminal of motor platform are coupled together;
When wiring makes a mistake, described relay protective scheme loop can make described first relay, the second relay and the whole open circuit of the 3rd relay, avoids causing voltage to raise, damage the motor error running of described single phase alternating current (A.C.) three-speed motor.
Further, the first described relay, the second relay and the 3rd relay are two-way relay.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention's three two-way relays constitute relay protective scheme loop between described single phase alternating current (A.C.) three-speed motor and external power source, when wiring makes a mistake, the motor coil of certain two relay in described relay protective scheme loop can form series relationship, thus all relays cannot be worked and by whole for circuit open circuit, avoid the error running of motor, this error running can cause voltage to raise, motor coil temperature sharply rises, destroy the insulation of enamelled wire, until burn motor, even cause fire, described wiring error protector and method can when false wirings, reach the object preventing from damaging single phase alternating current (A.C.) three-speed motor and protection motor.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of single phase alternating current (A.C.) three-speed motor.
The schematic diagram of Fig. 2 prior art.
Fig. 3 is apparatus structure sketch of the present invention.
Fig. 4 is installation wiring schematic diagram of the present invention.
Fig. 5 is one of false wiring situation schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the wiring error protector for single phase alternating current (A.C.) three-speed motor of the present invention and method are described in further detail, but can not therefore limit the scope of the invention.
Refer to the schematic diagram of Fig. 3 embodiment of the present invention, the wiring error protector that diagram is used for single phase alternating current (A.C.) three-speed motor comprises Terminal of motor platform PM, thermostat terminal board TCP, the first relay, the second relay and the 3rd relay.In conjunction with consulting Fig. 4, described Terminal of motor platform PM is connected with described single phase alternating current (A.C.) three-speed motor M, and this Terminal of motor platform PM includes zero line terminals, low speed terminals, middling speed terminals and high speed terminals.Described thermostat terminal board TCP is connected with the single-phase 220V/50Hz AC power in outside by thermostat TC, and this thermostat terminal board TCP includes fire line terminal, zero terminal, low speed terminal, middling speed terminal and high-speed terminal.Described first relay, the second relay and the 3rd relay are two-way relay, and they jointly form relay protective scheme loop and are connected between described Terminal of motor platform PM and thermostat terminal board TCP; When wiring makes a mistake; described relay protective scheme loop can make described first relay, the second relay and the whole open circuit of the 3rd relay; avoid the error running of motor, this error running can cause voltage raise and damage described single phase alternating current (A.C.) three-speed motor M.
Refer to Fig. 3, described relay protective scheme loop refers to: the motor coil KA1 of described first relay be together in series and the normally closed interlock A3 of described 3rd relay is connected between the high-speed terminal of described thermostat terminal board TCP and the zero line terminals of described Terminal of motor platform PM, and the normally open contact K1 of described first relay is connected between the high-speed terminal of described thermostat terminal board TCP and the high speed terminals of described Terminal of motor platform PM; The motor coil KA2 of described second relay be together in series and the normally closed interlock A1 of described first relay is connected between the middling speed terminal of described thermostat terminal board TCP and the zero line terminals of described Terminal of motor platform PM, and the normally open contact K2 of described second relay is connected between the middling speed terminal of described thermostat terminal board TCP and the middling speed terminals of described Terminal of motor platform PM; The motor coil KA3 of described 3rd relay be together in series and the normally closed interlock A2 of described second relay is connected between the low speed terminal of described thermostat terminal board TCP and the zero line terminals of described Terminal of motor platform PM, and the normally open contact K3 of described 3rd relay is connected between the low speed terminal of described thermostat terminal board TCP and the low speed terminals of described Terminal of motor platform PM; The zero terminal of described thermostat terminal board TCP is connected with the zero line terminals of described Terminal of motor platform PM.
Described first relay, the second relay and the 3rd relay are arranged on a printed substrate, and this printed substrate arranges cabling by Fig. 3, form relay protective scheme loop.Described Terminal of motor platform PM and thermostat terminal board TCP welded and installed are on a printed-wiring board; and be fixed in metal coating shell together with printed substrate with the first relay, the second relay, the 3rd relay; ensure insulation, a metal shell lid is covered on metal coating shell by two M4 tapping screws.
When the normally closed interlock of each relay is to be switched to mid ranger by top gear as thermostat TC, being switched by mid ranger or switched to top gear by low or first gear to low or first gear, a relay is always had to be in open-circuit condition in three relays, thus circuit can not conducting immediately, relay motor coil is fully discharged, then just carries out next action.
Means of defence for single phase alternating current (A.C.) three-speed motor wiring error of the present invention, it comprises Terminal of motor platform PM, thermostat terminal board TCP, the first relay, the second relay and the 3rd relay, and described first relay, the second relay and the 3rd relay are two-way relay.Refer to Fig. 4, described Terminal of motor platform PM is connected with described single phase alternating current (A.C.) three-speed motor M, includes zero line terminals, low speed terminals, middling speed terminals and high speed terminals; Described thermostat terminal board TCP is connected by the live wire L of thermostat TC and the single-phase 220V/50Hz AC power in outside and zero line N, and this thermostat terminal board TCP includes fire line terminal, zero terminal, low speed terminal, middling speed terminal and high-speed terminal; Described first relay, the second relay and the 3rd relay are connected into relay protective scheme loop according to the following step:
1) the normally closed interlock A3 of the motor coil KA1 of described first relay and described 3rd relay is together in series, be connected between the high-speed terminal of described thermostat terminal board TCP and the zero line terminals of described Terminal of motor platform PM, the normally open contact K1 of described first relay be connected between the high-speed terminal of described thermostat terminal board TCP and the high speed terminals of described Terminal of motor platform PM;
2) the normally closed interlock A1 of the motor coil KA2 of described second relay and described first relay is together in series, be connected between the middling speed terminal of described thermostat terminal board TCP and the zero line terminals of described Terminal of motor platform PM, the normally open contact K2 of described second relay be connected between the middling speed terminal of described thermostat terminal board TCP and the middling speed terminals of described Terminal of motor platform PM;
3) the motor coil KA3 of described 3rd relay and the normally closed interlock A2 of described second relay is together in series, be connected between the low speed terminal of described thermostat terminal board TCP and the zero line terminals of described Terminal of motor platform PM, the normally open contact K3 of described 3rd relay be connected between the low speed terminal of described thermostat terminal board TCP and the low speed terminals of described Terminal of motor platform PM;
4) the zero line terminals of the zero terminal of described thermostat terminal board TCP and described Terminal of motor platform PM are coupled together.
When correct wiring, the course of work of described wiring error protector is as follows:
1) when thermostat TC upshift, the motor coil KA1 conducting of the first relay, the normally open contact K1 of the first relay closes, voltage between the high speed terminals (red line R) of Terminal of motor platform PM and zero line terminals (yellow line Y) is 220V, and single phase alternating current (A.C.) three-speed motor M is by running up;
2) when thermostat TC adjusts mid ranger, the motor coil KA2 conducting of the second relay, the normally open contact K2 of the second relay closes, voltage between the middling speed terminals (blue line BU) of Terminal of motor platform PM and zero line terminals (yellow line Y) is 220V, and single phase alternating current (A.C.) three-speed motor M is by middling speed running;
3) when thermostat TC downshift, the motor coil KA3 conducting of the 3rd relay, the normally open contact K3 of the 3rd relay closes, voltage between the low speed terminals (black line BA) of Terminal of motor platform PM and zero line terminals (yellow line Y) is 220V, and single phase alternating current (A.C.) three-speed motor M presses low-speed running.
The situation of motor external power cord wiring error has 18 kinds, when wiring makes a mistake, if the first relay, the second relay and the 3rd relay can normally work, voltage then between Terminal of motor platform PM rotating speed terminals and zero line terminals is 220V, and single phase alternating current (A.C.) three-speed motor M operates; If described relay protective scheme loop can make described first relay, the second relay and the whole open circuit of the 3rd relay; first relay, the second relay and the 3rd relay cisco unity malfunction; voltage between Terminal of motor platform PM each rotating speed terminals (red line R, blue line BU, black line BA) and zero line terminals (yellow line Y) is 0V; single phase alternating current (A.C.) three-speed motor M does not operate, thus avoids causing voltage to raise, damaging the motor error running of single phase alternating current (A.C.) three-speed motor M.Concrete principle is if table 3 (1) is to 3 (3):
Table 3 (1)
Table 3 (2)
Table 3 (3)
For the 5th kind of false wiring situation in table 3 (1), the zero line of thermostat TC accesses the high-speed terminal of thermostat terminal board TCP mistakenly, the top gear of thermostat TC accesses the zero terminal of thermostat terminal board TCP mistakenly, and other gear wiring is correct, sees Fig. 5.Concrete motor operation situation is as follows:
1) when thermostat TC upshift, the motor coil KA1 conducting of the first relay, the normally open contact K1 of the first relay closes, voltage between the high speed terminals (red line R) of Terminal of motor platform PM and zero line terminals (yellow line Y) is 220V, and single phase alternating current (A.C.) three-speed motor M is by running up;
2) when thermostat TC adjusts mid ranger, the motor coil KA1 of the first relay connects with the motor coil KA2 of the second relay conducting, the series voltage of each relay motor coil drops to 110V, the normal open circuit of the normally open contact K1 of the first relay and the normally open contact K2 of the second relay keeps open circuit, voltage between each shelves terminals (red line R, blue line BU, black line BA) of Terminal of motor platform PM and zero line terminals (yellow line Y) is 0V, and single phase alternating current (A.C.) three-speed motor M does not operate;
3) when thermostat TC downshift, the motor coil KA1 of the first relay connects with the motor coil KA3 of the 3rd relay conducting, the series voltage of each relay motor coil drops to 110V, the normally open contact K1 of the first relay and the normally open contact K3 of the 3rd relay keeps open circuit, voltage between each shelves terminals (red line R, blue line BU, black line BA) of Terminal of motor platform PM and zero line terminals (yellow line Y) is 0V, and single phase alternating current (A.C.) three-speed motor M does not operate.
The present invention is not only applicable to the fan coil units of central air-conditioning, and is widely used in the wiring error protection of single phase alternating current (A.C.) three-speed motor.
Above are only preferred embodiment of the present invention, be not used for limiting practical range of the present invention, all equivalences done according to content of the present invention change and modify, and all should be the scope that the present patent application is claimed.
Claims (5)
1. for a wiring error protector for single phase alternating current (A.C.) three-speed motor, it is characterized in that: described wiring error protector comprises Terminal of motor platform, thermostat terminal board, the first relay, the second relay and the 3rd relay; Described Terminal of motor platform is connected with described single phase alternating current (A.C.) three-speed motor, include zero line terminals, low speed terminals, middling speed terminals and high speed terminals, described thermostat terminal board is connected with outside single phase alternating current power supply by thermostat, include fire line terminal, zero terminal, low speed terminal, middling speed terminal and high-speed terminal, described first relay, the second relay and the 3rd relay form relay protective scheme loop and are connected between described Terminal of motor platform and thermostat terminal board; When wiring makes a mistake, described relay protective scheme loop can make described first relay, the second relay and the whole open circuit of the 3rd relay, avoids causing voltage to raise, damage the motor error running of described single phase alternating current (A.C.) three-speed motor.
2. the wiring error protector for single phase alternating current (A.C.) three-speed motor according to claim 1, it is characterized in that: described relay protective scheme loop refers to, the motor coil of described first relay be together in series and the normally closed interlock of described 3rd relay are connected between the high-speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, and the normally open contact of described first relay is connected between the high-speed terminal of described thermostat terminal board and the high speed terminals of described Terminal of motor platform; The motor coil of described second relay be together in series and the normally closed interlock of described first relay are connected between the middling speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, and the normally open contact of described second relay is connected between the middling speed terminal of described thermostat terminal board and the middling speed terminals of described Terminal of motor platform; The motor coil of described 3rd relay be together in series and the normally closed interlock of described second relay are connected between the low speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, and the normally open contact of described 3rd relay is connected between the low speed terminal of described thermostat terminal board and the low speed terminals of described Terminal of motor platform; The zero terminal of described thermostat terminal board is connected with the zero line terminals of described Terminal of motor platform.
3. the wiring error protector for single phase alternating current (A.C.) three-speed motor according to claim 1 and 2, is characterized in that: the first described relay, the second relay and the 3rd relay are two-way relay.
4. the means of defence for single phase alternating current (A.C.) three-speed motor wiring error, it is characterized in that: described means of defence comprises Terminal of motor platform, thermostat terminal board, the first relay, the second relay and the 3rd relay, described Terminal of motor platform is connected with described single phase alternating current (A.C.) three-speed motor, include zero line terminals, low speed terminals, middling speed terminals and high speed terminals, described thermostat terminal board is connected with outside single phase alternating current power supply by thermostat, includes fire line terminal, zero terminal, low speed terminal, middling speed terminal and high-speed terminal; Described first relay, the second relay and the 3rd relay are connected into relay protective scheme loop according to the following step:
1) normally closed interlock of the motor coil of described first relay and described 3rd relay is together in series, be connected between the high-speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, the normally open contact of described first relay be connected between the high-speed terminal of described thermostat terminal board and the high speed terminals of described Terminal of motor platform;
2) normally closed interlock of the motor coil of described second relay and described first relay is together in series, be connected between the middling speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, the normally open contact of described second relay be connected between the middling speed terminal of described thermostat terminal board and the middling speed terminals of described Terminal of motor platform;
3) motor coil of described 3rd relay and the normally closed interlock of described second relay are together in series, be connected between the low speed terminal of described thermostat terminal board and the zero line terminals of described Terminal of motor platform, the normally open contact of described 3rd relay is connected between the low speed terminal of described thermostat terminal board and the low speed terminals of described Terminal of motor platform;
4) the zero line terminals of the zero terminal of described thermostat terminal board and described Terminal of motor platform are coupled together;
When wiring makes a mistake, described relay protective scheme loop can make described first relay, the second relay and the whole open circuit of the 3rd relay, avoids causing voltage to raise, damage the motor error running of described single phase alternating current (A.C.) three-speed motor.
5. the means of defence for single phase alternating current (A.C.) three-speed motor wiring error according to claim 4, is characterized in that: the first described relay, the second relay and the 3rd relay are two-way relay.
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| CN201510687969.5A CN105356418B (en) | 2015-10-21 | 2015-10-21 | Wiring error protector and method for single phase ac three-speed motor |
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| CN2308038Y (en) * | 1997-07-18 | 1999-02-17 | 许谦 | Temp. controller for ventilator coil |
| US6184795B1 (en) * | 1998-10-02 | 2001-02-06 | Siemens Energy & Automation, Inc. | Motor controller having dead ended winding detection capability on a single phase line |
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| CN104300499A (en) * | 2013-07-15 | 2015-01-21 | 珠海格力电器股份有限公司 | Single-phase speed-regulating motor protection circuit, single-phase speed-regulating motor and blower fan coil pipe |
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