CN105490590A - AC motor voltage-reduction starting apparatus based on rotating speed setting and method thereof - Google Patents
AC motor voltage-reduction starting apparatus based on rotating speed setting and method thereof Download PDFInfo
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- CN105490590A CN105490590A CN201610060874.5A CN201610060874A CN105490590A CN 105490590 A CN105490590 A CN 105490590A CN 201610060874 A CN201610060874 A CN 201610060874A CN 105490590 A CN105490590 A CN 105490590A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/32—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by star-delta switching
Abstract
The invention provides an AC motor voltage-reduction starting apparatus based on rotating speed setting and a method thereof. The AC motor voltage-reduction starting apparatus comprises a rotating speed detection device, forty decimal BCD dial switches and a controller. The rotating speed detection device comprises a speed measuring code disc and a concave mutual-emission photoelectric sensor. The speed measuring code disc is fixedly disposed on a rotating main shaft of an AC motor. A groove of the concave mutual-emission photoelectric sensor sleeves the speed measuring code disc, and the output end of the concave mutual-emission photoelectric sensor is connected to a rotating speed detection port of the controller. The forty decimal BCD dial switches are connected to rotating speed setting ports corresponding to the controller separately, and are used for setting the rotating speed of the AC motor during Y-[delta] starting. An output port of the controller is connected to a Y-[delta] conversion circuit of the AC motor. External starting/stopping signals of the AC motor are input to corresponding input ports of the controller. The invention also provides a method of the AC motor voltage-reduction starting apparatus based on rotating speed setting, which enables an AC motor starting process to be stable and free of impact.
Description
Technical field
The invention belongs to alternating current machine technical field, be specifically related to the alternating current machine pressure-reduction starting device based on speed setting and the method for a kind of alternating current machine for middle low power decompression smooth starting.
Background technology
AC induction motor is widely used in the every field of industrial and agricultural production.At present, the starting method of alternating current machine is a lot, and high-power AC motor adopts the methods such as soft initiator, rotor crosstalk resistance, the quick reactor of rotor string frequency usually.And the startup major part of the middle small machine method such as adopt Y-Δ decompression starting, stator crosstalk anti-.
Traditional Y-Δ decompression starting adopts the method for timing to carry out to motor stator winding the conversion that Y (star) and Δ (triangle) connect.Vary in size because motor institute is load-carrying, time needed for startup is different in size, if the starter motor when load is larger, traditional timing Y-Δ startup can cause motor just to carry out the conversion of Y-Δ under larger current, larger impact can be caused like this to load, shorten the useful life of motor, time serious, meeting motor damage, does not reach the flattening effect of decompression starting.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of alternating current machine pressure-reduction starting device based on speed setting and method, can realize stator winding Y connection in Y-Δ start-up course and, to the smooth conversion of Δ connection, ensure the startup safety of motor simultaneously.
In order to solve the problems of the technologies described above, the invention provides a kind of alternating current machine pressure-reduction starting device based on speed setting, form primarily of Rotating speed measring device, four decimal system BCD toggle switchs and controller; Wherein, described Rotating speed measring device is made up of test the speed code-disc and a spill correlation photoelectric sensor, the described code-disc that tests the speed is fixedly mounted on the rotating spindle of alternating current machine, the groove of spill correlation photoelectric sensor is enclosed within along the edge of the code-disc that tests the speed and tests the speed on code-disc, and the output of spill correlation photoelectric sensor is connected to the Rotating speed measring port of controller; Four decimal system BCD toggle switchs are connected to speed setting port corresponding to described controller respectively, and rotating speed during for starting the Y-Δ of described alternating current machine sets; The output port of described controller connects the Y-Δ change-over circuit of alternating current machine, and the outside start/stop signal of described alternating current machine inputs to the corresponding input port of described controller.
Further, the described code-disc that tests the speed is that 10 line metals test the speed code-disc, described spill correlation photoelectric sensor is spill NPN type correlation photoelectric sensor, when alternating current machine runs, test the speed the main shaft coaxial rotating of code-disc and alternating current machine, the light that the luminous tube of spill correlation photoelectric sensor the sends code-disc that can be tested the speed periodically cuts off, the light that the receiving tube of spill correlation photoelectric sensor receives also can cyclic variation, when described receiving tube receives light, the output output low level " 0 " of spill correlation photoelectric sensor, otherwise, export high level " 1 ", thus form the different pulse signals of the different rotating speed of corresponding alternating current machine.
Further, the described code-disc that tests the speed is fixedly set on the rotating spindle of alternating current machine, described spill correlation photoelectric sensor is fixed by screws on the mounting panel of alternating current machine, described in the test the speed edge of code-disc equal and do not touch described spill correlation photoelectric sensor apart from the distance of the groove inner edge of described spill correlation photoelectric sensor.
Further, the output of described spill correlation photoelectric sensor is connected with the Rotating speed measring port of described controller by a photoisolator.
Further, described controller adopts Measuring Frequency Method to calculate the rotating speed of alternating current machine according to the output of described spill correlation photoelectric sensor.
Further, described controller is AT89C52 series monolithic controller.
Further, each BCD toggle switch has 5 pins: 8,4,2,1 and A, A be common port, connect+5V power supply, when the numeral on BCD toggle switch changes to 9 from 0,8,4,2,1 pin will export corresponding level.
Further, described Y-Δ change-over circuit is primarily of two relay K 1 and K2 composition, relay K 1 is connected the corresponding output port of described controller respectively with the coil of K2 coil, the outside start/stop signal of described alternating current machine is respectively by contactor KM1, the contact of KM2 inputs to the input port of described controller, and when the closing of contact of contactor KM1, the input port of the controller that this contact connects is high level, the output port of the controller that relay K 1 coil connects is high level, relay K 1 is charged, the stator winding of the auxiliary contact control alternating current machine of relay K 1 is connected into Y shape and starts, when the rotating speed of alternating current machine reaches the rotating speed of described four BCD toggle switchs setting, the output port output low level of the controller that relay K 1 coil connects, relay K 1 dead electricity, the output port of the controller that relay K 2 coil connects exports high level, relay K 2 is charged, the stator winding of the auxiliary contact control alternating current machine of relay K 2 is converted to Δ shape by Y shape connection and connects, and starts and terminates, when the closing of contact of contactor KM2, the input port of the controller that this contact connects is high level, and the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current machine shuts down.
Further, described Y-Δ change-over circuit also comprises indicator light, and described indicator light is connected to the indicator light control port of described controller, and when the stator winding of described alternating current machine is connected into Y shape startup, described indicator light control port exports high level, the charged instruction of indicator light; When the stator winding of described alternating current machine transfers the connection of Δ shape to by Y shape connection, described indicator light control port output low level, indicator light dead electricity is extinguished.
The invention provides a kind of method of the above-mentioned alternating current machine pressure-reduction starting device based on speed setting, comprising:
The external start signal of alternating current machine is received by the corresponding input port of controller;
By rotating disk and the rotating speed of spill correlation photoelectric sensor detection in described alternating current machine start-up course of testing the speed, and rotating speed when being set the Y-Δ startup of described alternating current machine by four decimal system BCD toggle switchs;
The rotating speed that described controller detects according to the rotating speed of described four decimal system BCD toggle switchs setting and described spill correlation photoelectric sensor, start conversion to the Y-Δ of described alternating current machine to control, make the stator winding of described alternating current machine be connected into Y shape when starting to start, when the rotating speed of described alternating current machine reaches the rotating speed of described four decimal system BCD toggle switchs setting, then the stator winding controlling described alternating current machine is again converted to Δ shape by Y shape connection and connects, and terminates Y-Δ and starts.
Further, described Y-Δ change-over circuit is primarily of two relay K 1 and K2 composition, when external start signal received by controller, the closing of contact of contactor KM1, the output port of the controller that relay K 1 coil connects is high level, relay K 1 is charged, and the stator winding of the auxiliary contact control alternating current machine of relay K 1 is connected into Y shape and starts; When the rotating speed of alternating current machine reaches the rotating speed of described four decimal system BCD toggle switchs setting, the output port output low level of the controller that relay K 1 coil connects, relay K 1 dead electricity, the output port of the controller that relay K 2 coil connects exports high level, relay K 2 is charged, the stator winding of the auxiliary contact control alternating current machine of relay K 2 is converted to Δ shape by Y shape connection and connects, and starts and terminates.
Further, when outside stop signal received by controller, the closing of contact of contactor KM2, the input port of the controller that this contact connects is high level, the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current machine shuts down.
Compared with prior art, technical scheme of the present invention has following beneficial effect:
1, the alternating current machine pressure-reduction starting device based on speed setting of the present invention, structure is simple, cost is low, coordinated by the rotating disk that tests the speed, spill correlation photoelectric sensor, controller and four decimal system BCD toggle switchs, can by starting the setting of rotating speed to alternating current machine, to realize in alternating current machine Y-Δ start-up course its stator winding from Y connection to the smooth conversion of Δ connection, electric motor starting security of operation.
2, the method for the interchange pressure-reduction starting device based on speed setting of the present invention, by the startup rotating speed of the stator winding of the conjunction measuring alternating current machine of test the speed rotating disk and spill correlation photoelectric sensor in Y-Δ start-up course, and when the rotating speed that the startup rotating speed of motor sets close to four decimal system BCD toggle switchs, controller is made to send Y-Δ switching signal, Y connection when being started by stator winding converts Δ shape connection to, terminate Y-Δ to start, thus make the decompression starting process of alternating current machine steadily, without impacting, ensure the startup safety of motor.
Accompanying drawing explanation
Fig. 1 is the structural representation of the interchange pressure-reduction starting device based on speed setting of the specific embodiment of the invention;
Fig. 2 is the scheme of installation of the Rotating speed measring device in the interchange pressure-reduction starting device of the specific embodiment of the invention;
Fig. 3 is the circuit structure diagram of the interchange pressure-reduction starting device based on speed setting of the specific embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, a kind of interchange pressure-reduction starting device based on speed setting of the present invention and method are described in further detail.
As shown in Figure 1, the invention provides a kind of alternating current machine pressure-reduction starting device based on speed setting, form primarily of Rotating speed measring device 20, four decimal system BCD toggle switchs 23 and controller 22; Wherein, described Rotating speed measring device 20 is made up of test the speed code-disc 201 and a spill correlation photoelectric sensor 202, the described code-disc 201 that tests the speed is fixedly mounted on the rotating spindle of alternating current machine 11, the groove of spill correlation photoelectric sensor 202 is enclosed within along the edge of the code-disc 201 that tests the speed and tests the speed on code-disc 201, and the output of spill correlation photoelectric sensor 202 is connected to the Rotating speed measring port of controller 22; Four decimal system BCD toggle switchs 23 (i.e. BCD toggle switch 1, BCD toggle switch 2, BCD toggle switch 3, BCD toggle switch 4) are connected to the speed setting port of described controller 22 correspondence respectively, and rotating speed during for starting the Y-Δ of described alternating current machine 11 sets; The output port of described controller 22 connects the Y-Δ change-over circuit 12 of alternating current machine 11, and the outside start/stop signal of described alternating current machine 11 inputs to the corresponding input port of described controller 22.
In the present embodiment, in order to the rotating speed that motor runs can be detected exactly, and change by the rotating speed of setting, export three partial functions to realize tachometric survey, speed setting and control, will specifically implement according to the following steps:
1. press shown in accompanying drawing 2, the code-disc 201 that tests the speed adopts 10 line metals to test the speed code-disc, spill correlation photoelectric sensor 202 adopts spill NPN type correlation photoelectric sensor, be sleeved on the rotating spindle 110 of alternating current machine 11 securely by the code-disc 201 that tests the speed, spill correlation photoelectric sensor 202 is fixed on the mounting panel 111 of alternating current machine 11 by screw 112.The code-disc 201 that tests the speed is equal as far as possible apart from the distance of the groove inner edge of spill correlation photoelectric sensor 202, the test the speed edge of code-disc 201 can not touch the groove inner edge of spill correlation photoelectric sensor 202, and the code-disc 201 that namely tests the speed does not contact with spill correlation photoelectric sensor 202.When alternating current machine starts running, test the speed rotating spindle 110 coaxial rotating of code-disc 201 and alternating current machine 11, at this moment the light that the luminous tube of spill correlation photoelectric sensor 202 the sends code-disc 201 that can be tested the speed periodically cuts off, the light that the receiving tube of spill correlation photoelectric sensor 202 receives also can cyclic variation thereupon, when the receiving tube of spill correlation photoelectric sensor 202 receives light, the output output low level " 0 " of spill correlation photoelectric sensor 202, otherwise, when the receiving tube of spill correlation photoelectric sensor 202 does not receive light, the output of spill correlation photoelectric sensor 202 exports high level " 1 ", therefore, the different rotating speed of corresponding alternating current machine 11, spill correlation photoelectric sensor 202 will the different pulse signal of output frequency, after controller 22 receives this pulse signal, M method can be adopted, i.e. Measuring Frequency Method, calculate the real-time rotate speed of alternating current machine.
2. as shown in figures 1 and 3, an input (i.e. input of photophore side of the output of spill correlation photoelectric sensor 202 No. 2 ends of 202 (namely in Fig. 3) and a photoisolator 21, as shown in 21 No. 2 ends in Fig. 3) be connected, the power end of spill correlation photoelectric sensor 202 No. 1 end of 202 (namely in Fig. 3) connects+24V power supply, and by another input of resistance R1 and photoisolator 21 (i.e. another input of photophore side, as in Fig. 3 21 No. 1 end shown) connected.Therefore, the low and high level that spill correlation photoelectric sensor 202 output exports, pulse signal can be input to the Rotating speed measring port P2.0 port of 22 (namely in Fig. 3) of controller 22 through photoisolator 21, an output (i.e. input of light-receiving device side of photoisolator 21, as shown in 21 No. 3 ends in Fig. 3) be connected to the Rotating speed measring port P2.0 port of 22 (namely in Fig. 3) of controller 22 and be connected to+5V power supply by resistance R2, another output (i.e. another input of light-receiving device side of photoisolator 21, as shown in 21 No. 4 ends in Fig. 3) ground connection, when the input of photoisolator 21 is applied the signal of telecommunication by spill correlation photoelectric sensor 202, the photophore of photoisolator 21 emits beam, the light-receiving device of photoisolator 21 just produces photoelectric current after accepting light, flow out from its output, thus achieve " electricity-light-electricity " conversion.
3. please refer to Fig. 1 and Fig. 3, controller 22 adopts AT89C52 series monolithic controller.Before carrying out alternating current machine 11 and starting, the Y-Δ manually being arranged alternating current machine by the decimal system BCD toggle switch 23 of four in accompanying drawing 3 starts the rotating speed changed, usual speed setting is about 90% of Rated motor rotating speed, four BCD toggle switchs 1,2,3,4 represent the individual position-kilobit of setting electric current respectively, can set alternating current machine 11 Y-Δ start time rotating speed to kilobit, meet the needs of the rotating speed of various medium and small alternating current machine.Four decimal system BCD toggle switchs 23 are connected with the P0.0-P0.3 port of AT89C52 series monolithic controller, P0.4-P0.7 port, P1.0-P1.3 port and P1.4-P1.7 port respectively.Each BCD toggle switch has 5 pins, they be respectively 8,4,2,1 and A, A be common port, connect+5V power supply, when the numeral on toggle switch changes to 9 from 0,8421 pins will export corresponding level, such as when BCD toggle switch dial be 1 time, 1 pin and public control end A connect; When dial be 3 time, 1 and 2 pins and public control end A connect, and the output of each BCD toggle switch is 8421 yards thus.
4. the actual startup rotating speed of alternating current machine 11 that detects of the rotating speed that sets according to four decimal system BCD toggle switchs 23 of controller 22 and Rotating speed measring device 20, controls the Y-Δ change-over circuit 12 that alternating current machine 11 starts.Wherein, Y-Δ change-over circuit 12 is by two relay K 1, K2 and indicator light H1 is formed, No. 2 ends of the coil of relay K 1 and K2 are connected to P2.5 and the P2.6 port of AT89C52 series monolithic controller, No. 2 ends of contactor KM1 contact (outside of corresponding alternating current machine 11 starts control signal) and No. 4 ends of contactor KM2 contact (the outside stop control signal corresponding to alternating current machine 11) are connected to P2.1 and the P2.2 port of AT89C52 series monolithic controller, the common port 1 of the outside start/stop signal of alternating current machine 11 is connected with+5V power supply.Be used to indicate the indicator light H1 of the Y-Δ start-up course of alternating current machine 11, be connected to the P2.4 port of AT89C52 series monolithic controller.Thus, when controller 22 is when receiving the external start signal of alternating current machine 11, the contactor KM1 closing of contact, the P2.1 port of controller 22 is high level, and P2.5 port exports high level, and relay K 1 is charged, the stator winding of its auxiliary contact control alternating current machine 11 is connected into Y shape and starts, meanwhile, P2.4 port exports high level, the charged instruction of indicator light H1; When the startup rotating speed of alternating current machine 11 reaches the rotating speed of four BCD toggle switches 26 settings, P2.5 port output low level, relay K 1 dead electricity, P2.6 port time delay certain hour (such as 0.5 second) exports high level afterwards, and relay K 2 is charged, and the stator winding that its auxiliary contact controls alternating current machine 11 is converted to the connection of Δ shape by Y shape connection, start and terminate, alternating current machine 11 operates under Δ shape connecting mode, P2.4 port output low level, and indicator light H1 dead electricity is extinguished; When outside stop signal received by controller 22, the contactor KM2 closing of contact, P2.2 port is high level, P2.6 port output low level, and relay K 2 dead electricity, alternating current machine 11 shuts down.
Therefore, alternating current machine pressure-reduction starting device based on speed setting of the present invention, structure is simple, cost is low, coordinated by the rotating disk that tests the speed, spill correlation photoelectric sensor, controller and four decimal system BCD toggle switchs, can by arranging the rotating speed of alternating current machine, to realize in alternating current machine Y-Δ start-up course its stator winding from Y connection to the smooth conversion of Δ connection, electric motor starting security of operation.
Please refer to Fig. 1 to Fig. 3, the present invention also provides a kind of method of the above-mentioned alternating current machine pressure-reduction starting device based on speed setting, comprising:
The external start signal of alternating current machine 11 is received by the corresponding input port of controller 22;
By the startup rotating speed of test the speed rotating disk 201 and the rotor of spill correlation detection in described alternating current machine 11 start-up course of Rotating speed measring device 20, and rotating speed when being set the Y-Δ startup of described alternating current machine 11 by four decimal system BCD toggle switchs 23;
The startup rotating speed that described controller 5 detects according to the rotating speed of described four decimal system BCD toggle switchs 23 setting and described Rotating speed measring device 20, start conversion to the Y-Δ of described alternating current machine 11 to control, make the stator winding of described alternating current machine 11 be connected into Y shape when starting to start, when the startup rotating speed of described alternating current machine 11 reaches the rotating speed of described four decimal system BCD toggle switchs 23 setting, then the stator winding controlling described alternating current machine 11 is again converted to Δ shape by Y shape connection and connects, and terminates Y-Δ and starts.
Further, described Y-Δ change-over circuit is primarily of two relay K 1 and K2 composition, when external start signal received by controller 22, the closing of contact of contactor KM1, the output port of the controller 22 that relay K 1 coil connects is high level, relay K 1 is charged, and the stator winding of the auxiliary contact control alternating current machine 11 of relay K 1 is connected into Y shape and starts; When the startup rotating speed of alternating current machine 11 reaches the rotating speed of described four decimal system BCD toggle switchs 23 setting, the output port output low level of the controller 22 that relay K 1 coil connects, relay K 1 dead electricity, the output port of the controller 22 that relay K 2 coil connects exports high level, relay K 2 is charged, the stator winding of the auxiliary contact control alternating current machine 11 of relay K 2 is converted to Δ shape by Y shape connection and connects, and starts and terminates.
Further, when outside stop signal received by controller 22, the closing of contact of contactor KM2, the input port of the controller 22 that this contact connects is high level, the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current machine 11 shuts down.
From the above mentioned, the method of the interchange pressure-reduction starting device based on speed setting of the present invention, measured the startup rotating speed of the rotor of alternating current machine 11 by Rotating speed measring device in Y-Δ start-up course, and when the rotating speed that the startup rotating speed of alternating current machine sets close to four decimal system BCD toggle switchs, controller 22 is made to send Y-Δ switching signal, Y connection when being started by stator winding converts Δ shape connection to, terminate Y-Δ to start, thus make the decompression starting process of alternating current machine steadily, without impacting, time ensure the startup safety of motor.
Claims (10)
1. based on an alternating current machine pressure-reduction starting device for speed setting, it is characterized in that, form primarily of Rotating speed measring device, four decimal system BCD toggle switchs and controller; Wherein, described Rotating speed measring device is made up of test the speed code-disc and a spill correlation photoelectric sensor, the described code-disc that tests the speed is fixedly mounted on the rotating spindle of alternating current machine, the groove of spill correlation photoelectric sensor is enclosed within along the edge of the code-disc that tests the speed and tests the speed on code-disc, and the output of spill correlation photoelectric sensor is connected to the Rotating speed measring port of controller; Four decimal system BCD toggle switchs are connected to speed setting port corresponding to described controller respectively, and rotating speed during for starting the Y-Δ of described alternating current machine sets; The output port of described controller connects the Y-Δ change-over circuit of alternating current machine, and the outside start/stop signal of described alternating current machine inputs to the corresponding input port of described controller.
2. alternating current machine pressure-reduction starting device as claimed in claim 1, it is characterized in that, the described code-disc that tests the speed is that 10 line metals test the speed code-disc, described spill correlation photoelectric sensor is spill NPN type correlation photoelectric sensor, when alternating current machine runs, test the speed the main shaft coaxial rotating of code-disc and alternating current machine, the light that the luminous tube of spill correlation photoelectric sensor the sends code-disc that can be tested the speed periodically cuts off, the light that the receiving tube of spill correlation photoelectric sensor receives also can cyclic variation, when described receiving tube receives light, the output output low level " 0 " of spill correlation photoelectric sensor, otherwise, export high level " 1 ", thus form the different pulse signals of the different rotating speed of corresponding alternating current machine.
3. alternating current machine pressure-reduction starting device as claimed in claim 1, it is characterized in that, the described code-disc that tests the speed is fixedly set on the rotating spindle of alternating current machine, described spill correlation photoelectric sensor is fixed by screws on the mounting panel of alternating current machine, described in the test the speed edge of code-disc equal and do not touch described spill correlation photoelectric sensor apart from the distance of the groove inner edge of described spill correlation photoelectric sensor.
4. alternating current machine pressure-reduction starting device as claimed in claim 1, is characterized in that, the output of described spill correlation photoelectric sensor is connected with the Rotating speed measring port of described controller by a photoisolator; Described controller is according to the output of described spill correlation photoelectric sensor and adopt Measuring Frequency Method to calculate the rotating speed of alternating current machine.
5. alternating current machine pressure-reduction starting device as claimed in claim 1, it is characterized in that, each BCD toggle switch has 5 pins: 8,4,2,1 and A, A is common port, connect+5V power supply, when the numeral on BCD toggle switch changes to 9 from 0,8,4,2,1 pin will export corresponding level.
6. alternating current machine pressure-reduction starting device as claimed in claim 1, it is characterized in that, described Y-Δ change-over circuit is primarily of two relay K 1 and K2 composition, relay K 1 is connected the corresponding output port of described controller respectively with the coil of K2 coil, the outside start/stop signal of described alternating current machine is respectively by contactor KM1, the contact of KM2 inputs to the input port of described controller, and when the closing of contact of contactor KM1, the input port of the controller that this contact connects is high level, the output port of the controller that relay K 1 coil connects is high level, relay K 1 is charged, the stator winding of the auxiliary contact control alternating current machine of relay K 1 is connected into Y shape and starts, when the rotating speed of alternating current machine reaches the rotating speed of described four BCD toggle switchs setting, the output port output low level of the controller that relay K 1 coil connects, relay K 1 dead electricity, the output port of the controller that relay K 2 coil connects exports high level, relay K 2 is charged, the stator winding of the auxiliary contact control alternating current machine of relay K 2 is converted to Δ shape by Y shape connection and connects, and starts and terminates, when the closing of contact of contactor KM2, the input port of the controller that this contact connects is high level, and the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current machine shuts down.
7. alternating current machine pressure-reduction starting device as claimed in claim 6, it is characterized in that, described Y-Δ change-over circuit also comprises indicator light, described indicator light is connected to the indicator light control port of described controller, and when the stator winding of described alternating current machine is connected into Y shape startup, described indicator light control port exports high level, the charged instruction of indicator light; When the stator winding of described alternating current machine transfers the connection of Δ shape to by Y shape connection, described indicator light control port output low level, indicator light dead electricity is extinguished.
8. a method for the alternating current machine pressure-reduction starting device based on speed setting according to any one of claim 1 to 7, is characterized in that, comprising:
The external start signal of alternating current machine is received by the corresponding input port of controller;
By rotating disk and the rotating speed of spill correlation photoelectric sensor detection in described alternating current machine start-up course of testing the speed, and rotating speed when being set the Y-Δ startup of described alternating current machine by four decimal system BCD toggle switchs;
The rotating speed that described controller detects according to the rotating speed of described four decimal system BCD toggle switchs setting and described spill correlation photoelectric sensor, start conversion to the Y-Δ of described alternating current machine to control, make the stator winding of described alternating current machine be connected into Y shape when starting to start, when the rotating speed of described alternating current machine reaches the rotating speed of described four decimal system BCD toggle switchs setting, then the stator winding controlling described alternating current machine is again converted to Δ shape by Y shape connection and connects, and terminates Y-Δ and starts.
9. method as claimed in claim 8, it is characterized in that, described Y-Δ change-over circuit is primarily of two relay K 1 and K2 composition, when external start signal received by controller, the closing of contact of contactor KM1, the output port of the controller that relay K 1 coil connects is high level, and relay K 1 is charged, and the stator winding of the auxiliary contact control alternating current machine of relay K 1 is connected into Y shape and starts; When the rotating speed of alternating current machine reaches the rotating speed of described four decimal system BCD toggle switchs setting, the output port output low level of the controller that relay K 1 coil connects, relay K 1 dead electricity, the output port of the controller that relay K 2 coil connects exports high level, relay K 2 is charged, the stator winding of the auxiliary contact control alternating current machine of relay K 2 is converted to Δ shape by Y shape connection and connects, and starts and terminates.
10. method as claimed in claim 9, it is characterized in that, when outside stop signal received by controller, the closing of contact of contactor KM2, the input port of the controller that this contact connects is high level, the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current machine shuts down.
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| CN201302578Y (en) * | 2008-12-05 | 2009-09-02 | 长安大学 | Motor velocity measuring device of intelligent model car |
| US20140070754A1 (en) * | 2012-09-10 | 2014-03-13 | Sandvik Mining And Construction Oy | Mining Vehicle |
| JP2015078607A (en) * | 2013-10-15 | 2015-04-23 | 株式会社神戸製鋼所 | Starting device and starting method of compressor |
| CN104310190A (en) * | 2014-08-26 | 2015-01-28 | 日立电梯（广州）自动扶梯有限公司 | Escalator control system and method for controlling operation of escalator |
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| CN105490590B (en) | 2018-12-14 |
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