Calibrator for mechanical center and electromagnetic center of direct current motor

Abstract

A direct current motor mechanical center and electromagnetic center calibration instrument comprises an upper shell, a lower shell rotationally connected with the upper shell and a calibration circuit arranged on the lower shell, the calibration circuit comprises a power supply, a lithium battery connected with the power supply, a direct current ampere meter and an alternating current ampere meter, and positive wires of the lithium battery and the power supply are connected with a power supply change-over switch. The power change-over switch is electrically connected with the input end of a time pulser and a mechanical center verification button, the mechanical center verification button is connected with a third relay, and one set of switches of the third relay is connected with an inverter and a magnetic center verification button. The magnetic center verification button is electrically connected to one group of switches of the second relay and the first relay, the other group of switches of the third relay is electrically connected to the time pulser and the magnetic center verification button, and the switch, connected with the inverter, on the third relay is connected with the switch connected with the time pulser; the utility model has the advantage of convenience in use.

Description

Technical Field

[0001] The utility model belongs to the technical field of DC motors, and particularly relates to a DC motor mechanical center and electromagnetic center corrector. Background Art

[0002] A DC motor is a motor that converts DC electrical energy into mechanical energy. It is widely used in electric drive due to its good speed regulation performance. DC motors are divided into three categories: permanent magnet, separately excited, and self-excited according to the excitation method. During the production of DC motors, it is necessary to measure the neutral line and polarity of the brushes of the DC motor. The traditional method is to adjust the neutral line of the brushes of the DC motor to determine the polarity. The so-called neutral line of the DC motor brushes refers to the position where the brushes should be when the armature winding current alternates between positive and negative. Theoretically, the neutral line of the brushes should be on the radial center line of the main poles of the DC motor stator.

[0003] At present, a Chinese patent with the authorization announcement number CN111536864B discloses a central polarity correction circuit and a portable corrector, including a rechargeable power supply, the power supply is connected with a first voltmeter and a changeover switch, the changeover switch is connected with a brush neutral line test circuit and a brush polarity test circuit, the power supply, the first voltmeter, the changeover switch, the brush neutral line test circuit and the brush polarity test circuit are integrated in a box body, one side of the box body is provided with an openable protective cover, a handle is arranged at the upper edge of the box body, and a lock is arranged between the box body and the protective cover; when in use, it is ensured that the brushes are in the neutral line position and the brush polarity is accurate, which ensures the qualification of the produced DC motors and reduces the accident rate of the DC motors. However, this technical solution is inconvenient to use because it requires controlling multiple switches during use. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a DC motor mechanical center and electromagnetic center corrector that is convenient to use.

[0005] The technical solution of the utility model is as follows:

[0006] A DC motor mechanical center and electromagnetic center corrector, comprising an upper shell, a lower shell rotatably connected to the upper shell, and a correction circuit provided on the lower shell. The correction circuit includes a power supply, a lithium battery connected to the power supply, a DC ammeter, and an AC ammeter. A power supply switch is connected to the positive wire of the lithium battery and the power supply. The power supply switch is electrically connected to the input end of a time pulse generator and a mechanical center calibration button. The mechanical center calibration button is connected to a third relay. One set of switches of the third relay is connected to an inverter and a magnetic center calibration button. The magnetic center calibration button is electrically connected to one set of switches of a second relay and a first relay. The other set of switches of the third relay is electrically connected to the time pulse generator and the magnetic center calibration button. The switch of the third relay connected to the inverter and the switch connected to the time pulse generator are connected to each other;

[0007] Four sets of switches on the first relay are respectively connected to two first wiring terminals and two second wiring terminals. The DC ammeter and the AC ammeter are respectively connected to two sets of switches connected to the second wiring terminals. The inverter and the magnetic center calibration button are connected to four sets of switches on the second relay, and the four sets of switches on the second relay are respectively connected to the other two sets of switches connected to the first wiring terminals. The inverter is electrically connected to the output end of the time pulse generator.

[0008] Furthermore, each set of switches on the first relay and the third relay includes three contacts, and the three contacts form a normally open and a normally closed switch. The three contacts are respectively a normally open contact, a middle contact, and a normally closed contact. The two ends of the DC ammeter and the two ends of the AC ammeter are respectively connected to the normally closed contact and the normally open contact of the two sets of switches on the left side of the first relay. The second wiring terminal is connected to the middle contact of the two sets of switches on the left side of the first relay;

[0009] The connection relationship between the first wiring terminal, the four sets of switches of the second relay, and the two sets of switches on the right side of the first relay is the same as the connection relationship between the second wiring terminal, the DC ammeter, and the AC ammeter and the two sets of switches on the left side of the first relay;

[0010] The inverter, the magnetic center calibration button, and the power supply switch are respectively connected to the normally open contact, the normally closed contact, and the middle contact of one set of switches of the third relay. The normally open contact and the middle contact of the other set of switches of the third relay are both connected to the time pulse generator. The normally closed contact of the set of switches connected to the time pulse generator is connected to the magnetic center calibration button. The normally open contact connected to the inverter and the normally open contact connected to the time pulse generator are connected to each other.

[0011] Furthermore, the power supply switch is connected to a power supply indication switch, and the power supply indication switch is electrically connected to a digital DC voltage ammeter.

[0012] Furthermore, the AC ammeter, DC ammeter, first wiring terminal, second wiring terminal, charging indication switch, mechanical center calibration button, power supply switching switch, magnetic center calibration button, power supply indication switch, and digital DC voltage ammeter are all arranged on the upper surface of the lower case.

[0013] Furthermore, first light-emitting diodes are connected to the lines where the charging indication switch is connected to the lithium battery, the power supply switching switch is connected to the third relay, the power supply indication switch is connected to the digital DC voltage ammeter, the mechanical center calibration button is connected to the third relay, and the magnetic center calibration button is connected to the second relay. The first light-emitting diodes are all located on the lower case.

[0014] Furthermore, a second light-emitting diode connected to the magnetic center calibration button is arranged on one side of the DC ammeter, and a second light-emitting diode connected to the input end of the inverter is arranged on one side of the AC ammeter. The second light-emitting diodes are fixed on the lower case.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. The present utility model realizes the control of the detection circuit switching through the cooperation of the mechanical center calibration button, magnetic center calibration button and the third relay, which is convenient for personnel to switch independently according to needs, is convenient to use, and can be controlled only through two switches;

[0017] 2. The present utility model realizes the storage of electric energy through the lithium battery, which is convenient for personnel to use;

[0018] In short, the present utility model has the advantages of being convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the calibration circuit of the present utility model;

[0020] Figure 2 is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 3 is a schematic diagram of the principle of induction method electromagnetic center calibration of the present utility model;

[0022] Figure 4 is a schematic diagram of the principle of induction method mechanical center calibration of the present utility model.

[0023] In the figure, 1 is the upper shell, 2 is the AC ammeter, 3 is the mechanical center calibration button, 4 is the charging indicator switch, 5 is the first terminal, 6 is the connecting wire, 7 is the power switch, 8 is the second terminal, 9 is the magnetic center calibration button, 10 is the lower shell, 11 is the DC ammeter, 12 is the power indicator switch, 13 is the digital DC voltage and ammeter, 14 is the inverter, 15 is the third relay, 16 is the time pulse generator, 17 is the lithium battery, 18 is the first relay, 19 is the second relay, and 20 is the power supply. Detailed implementation mode

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0025] As Figures 1-4 shown, a DC motor mechanical center and electromagnetic center corrector includes an upper shell 1, a lower shell 10 rotatably connected to the upper shell 1, and a correction circuit provided on the lower shell 10, characterized in that: the correction circuit includes a power supply 20, a lithium battery 17 connected to the power supply 20, a DC ammeter 11, and an AC ammeter 2. The positive electrode wires of the lithium battery 17 and the power supply 20 are connected with a power switch 7. The power switch 7 is electrically connected to the input end of a time pulse generator 16 and a mechanical center calibration button 3. The mechanical center calibration button 3 is connected to a third relay 15. One group of switches of the third relay 15 is connected with an inverter 14 and a magnetic center calibration button 9. The magnetic center calibration button 9 is electrically connected to one group of switches of a second relay 19 and a first relay 18. The other group of switches of the third relay 15 is electrically connected to the time pulse generator 16 and the magnetic center calibration button 9. The switches of the third relay 15 connected to the inverter 14 and the switches connected to the time pulse generator 16 are connected to each other;

[0026] Four groups of switches on the first relay 18 are respectively connected with two first terminals 5 and two second terminals 8. The DC ammeter 11 and the AC ammeter 2 are respectively connected to two groups of switches connected to the second terminal 8. The inverter 14 and the magnetic center calibration button 9 are connected to four groups of switches on the second relay 19, and the four groups of switches on the second relay 19 are respectively connected to the other two groups of switches connected to the first terminal 5. The inverter 14 is electrically connected to the output end of the time pulse generator 16. Two black connecting wires 6 and two red connecting wires 6 are respectively inserted into the first terminal 5 and the second terminal 8;

[0027] The power switch 7 is connected to a power indicator switch 12, and the power indicator switch 12 is electrically connected to a digital DC volt-ammeter 13;

[0028] When mechanical center adjustment is required, connect two black connecting wires 6 to two adjacent brush rods of the motor brush holder, and connect two red connecting wires 6 to the armature terminal of the motor outlet box. Select to use the lithium battery 17 or the power supply 20 by rotating the power switch 7, press the power indicator switch 12 and then press the mechanical center calibration button 3; at this time, the lithium battery 17 or the power supply 20 supplies power to the inverter 14 through the third relay 15, and the inverter 14 generates an AC voltage of about 25V and connects it to the switch of the second relay 19. The time pulse generator 16 controls the switch of the second relay 19 to be attracted and disconnected. When the switch on the second relay 19 is attracted, the AC voltage intermittently supplies 25V AC to the excitation winding of the DC motor through the second relay 19 and the first relay 18. At this time, the AC ammeter 2 connected by the two black connecting wires 6 is connected to the excitation end to receive the circulating on-off AC, senses the voltage, and starts to have a reading swing;

[0029] When the position of the brush holder deviates from the mechanical center position, the pointer of the AC ammeter 2 does not show at the "0" position. As the switch of the second relay 19 is cyclically attracted and disconnected, the pointer of the AC voltmeter swings continuously between the "0" position and the right direction. The larger the swing value, the greater the deviation of the brush holder. At this time, adjustment should be made. First, loosen the fixing bolts of the brush holder slightly so that the brush holder can move along the circumferential direction, rotate left or right, slowly rotate the brush holder, and at the same time watch the swing direction of the pointer of the AC ammeter 2. If the swing direction is larger, it means that the deviation from the center position is farther. At this time, change the rotation direction until it is close to the "zero" position;

[0030] When electromagnetic center adjustment is required, connect the other ends of the two red connecting wires 6 to two adjacent brush rods of the motor brush holder, and connect the other ends of the two black connecting wires 6 to the excitation terminals of the motor outlet box respectively. Select to use the lithium battery 17 or the power supply 20 by rotating the power switch 7, press the power indicator switch 12 and then press the magnetic center calibration button 9. At this time, the pointer of the DC ammeter 11 is controlled by the on-off signal sent by the internal pulse module to attract and disconnect the second relay 19. The pointer of the DC ammeter 11 starts to swing left and right with "0" as the reference. The larger the swing amplitude, the greater the deviation of the electromagnetic center of the brush holder, and vice versa;

[0031] If there is a deviation in the brush center position during the test, the pointer of the DC ammeter 11 swings left and right with the "0" position as the center. The larger the swing amplitude, the closer the deviation from the center line position. If the brush is at (or quite close to the center position), the pointer of the DC millivoltmeter will not swing or the swing amplitude is very small;

[0032] When the test finds that the brush holder deviates from the center position, adjustment should be carried out. First, loosen the fixing bolts of the brush holder disc slightly so that the brush holder disc can rotate circumferentially. Slowly rotate the brush holder in one direction. At the same time, observe the swing of the pointer of the DC ammeter 11. If the swing amplitude becomes larger, it means that the center position of the brush holder deviates from the center position even more. At this time, change the rotation direction of the brush holder until the swing amplitude of the pointer of the DC ammeter 11 is minimized.

[0033] The method to judge the minimum swing amplitude is as follows: After the swing amplitude of the pointer of the DC ammeter 11 reaches a certain small range and then starts to increase, the swing amplitude before the increase reaches the minimum value. This point is the best position where the brush should be, that is, the center position.

[0034] In this embodiment, each group of switches on the first relay 18 and the third relay 15 includes three contacts, and the three contacts form two switches, one normally open and one normally closed. The three contacts are respectively the normally open contact, the middle contact, and the normally closed contact. The two ends of the DC ammeter and the two ends of the AC ammeter 2 are respectively connected to the normally closed contacts and the normally open contacts of the two groups of switches on the left side of the first relay 18. The second terminal 8 is connected to the middle contacts of the two groups of switches on the left side of the first relay 18;

[0035] The connection relationship between the first terminal 5, the four groups of switches of the second relay 19 and the two groups of switches on the right side of the first relay 18 is the same as the connection relationship between the second terminal 8, the DC ammeter 11, the AC ammeter 2 and the two groups of switches on the left side of the first relay 18;

[0036] The inverter 14, the magnetic center calibration button 9 and the power switch 7 are respectively connected to the normally open contact, the normally closed contact and the middle contact of one group of switches of the third relay 15. The normally open contacts and the middle contacts of the other group of switches of the third relay 15 are both connected to the time pulse generator 16. The normally closed contact of the group of switches connected to the time pulse generator 16 is connected to the magnetic center calibration button 9. The normally open contact connected to the inverter 14 and the normally open contact connected to the time pulse generator 16 are connected to each other.

[0037] In this embodiment, the AC ammeter 2, the DC ammeter 11, the first terminal 5, the second terminal 8, the charging indication switch 4, the mechanical center calibration button, the power switch 7, the magnetic center calibration button 9, the power indication switch 12 and the digital DC voltage ammeter 13 are all fixed on the upper surface of the lower case 10;

[0038] In this embodiment, first light-emitting diodes are connected to the circuit where the charging indication switch 4 is connected to the lithium battery 17, the circuit where the power supply switching switch 7 is connected to the third relay 15, the circuit where the power supply indication switch 12 is connected to the digital DC voltage and ammeter 13, the circuit where the mechanical center calibration button is connected to the third relay 15, and the circuit 6 where the magnetic center calibration button 9 is connected to the second relay 19. The first light-emitting diodes are all fixed on the lower case 10.

[0039] In this embodiment, a second light-emitting diode connected to the magnetic center calibration button 9 is arranged on one side of the DC ammeter 11, and a second light-emitting diode connected to the input end of the inverter 14 is arranged on one side of the AC ammeter 2. The second light-emitting diodes are fixed on the lower case 10;

[0040] During use, the first light-emitting diodes and the second light-emitting diodes are used to indicate whether the charging indication switch 4, the power supply switching switch 7, the power supply indication switch 12, the mechanical center calibration button, the magnetic center calibration button 9, the DC ammeter 11, and the AC ammeter 2 are working, which is convenient for personnel to check.

[0041] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A DC motor mechanical center and electromagnetic center calibration instrument, comprising an upper shell, a lower shell rotatably connected to the upper shell, and a calibration circuit disposed on the lower shell, characterized in that: The correction circuit includes a power supply, a lithium battery connected to the power supply, a DC ammeter and an AC ammeter, the positive lines of the lithium battery and the power supply are connected to a power switching switch, the power switching switch is electrically connected to the input end of the time pulser and the mechanical center verification button, the mechanical center verification button is connected to a third relay, one group of switches of the third relay is connected to an inverter and a magnetic center verification button, the magnetic center verification button is electrically connected to a group of switches of the second relay and the first relay, another group of switches of the third relay is electrically connected to the time pulser and the magnetic center verification button, and the switch on the third relay connected to the inverter and the switch connected to the time pulser are connected; The four groups of switches on the first relay are respectively connected to two first terminals and two second terminals, the DC ammeter and the AC ammeter are respectively connected to the two groups of switches connected to the second terminals, the inverter and the magnetic center verification button are connected to the four groups of switches on the second relay, and the four groups of switches on the second relay are respectively connected to the other two groups of switches connected to the first terminals, and the inverter is electrically connected to the output end of the time pulser.

2. The DC motor mechanical center and electromagnetic center calibration instrument according to claim 1, characterized in that: Each set of switches on the first relay and the third relay includes three contacts, and the three contacts form two switches, one normally open and one normally closed, the three contacts are respectively a normally open contact, a middle contact, and a normally closed contact, the two ends of the DC ammeter and the two ends of the AC ammeter are respectively connected to the normally closed contacts and the normally open contacts of the two sets of switches on the left side of the first relay, and the second wiring terminal is connected to the middle contact of the two sets of switches on the left side of the first relay; The connection relationship between the first wiring terminal, the four sets of switches of the second relay and the two sets of switches on the right side of the first relay is the same as the connection relationship between the second wiring terminal, the DC ammeter and the AC ammeter and the two sets of switches on the left side of the first relay; The inverter, magnetic center check button and power switching switch are respectively connected to the normally open contacts, normally closed contacts and middle contacts of one group of switches of the third relay. The normally open contacts and middle contacts of another group of switches of the third relay are connected to the time pulser. The normally closed contacts of a group of switches connected to the time pulser are connected to the magnetic center check button, and the normally open contacts connected to the inverter and the normally open contacts connected to the time pulser are connected to each other.

3. The DC motor mechanical center and electromagnetic center calibration instrument according to claim 2, characterized in that: The power switching switch is connected to a power indicating switch, and the power indicating switch is electrically connected to a digital DC voltage and current meter.

4. The DC motor mechanical center and electromagnetic center calibration instrument according to claim 3, characterized in that: The AC ammeter, DC ammeter, first wiring terminal, second wiring terminal, charging indication switch, mechanical center check button, power switch, magnetic center check button, power indication switch and digital DC voltage and current meter are all arranged on the upper surface of the lower shell.

5. The DC motor mechanical center and electromagnetic center calibration instrument according to claim 4, characterized in that: A first light-emitting diode is connected to the circuit connecting the charging indication switch and the lithium battery, the circuit connecting the power switching switch and the third relay, the circuit connecting the power indication switch and the digital DC voltage and current meter, the circuit connecting the mechanical center check button and the third relay, and the circuit connecting the magnetic center check button and the second relay, and the first light-emitting diodes are all located on the lower shell.

6. The DC motor mechanical center and electromagnetic center calibration instrument according to claim 5, characterized in that: A second light emitting diode connected to the magnetic center check button is arranged on one side of the DC ammeter, and a second light emitting diode connected to the inverter input terminal is arranged on one side of the AC ammeter, and the second light emitting diode is fixed on the lower shell.

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