An aging test device

Abstract

This utility model discloses an aging test device, comprising: a test power supply, a motor, and a housing. Both the test power supply and the motor are installed inside the housing. The test power supply receives AC power at its input terminal and its output terminal is connected to the power supply terminal of the motor. The test power supply periodically and alternately outputs positive and negative voltages to the motor. Based on the positive voltage, the motor's carbon brushes rotate forward, causing the motor's output voltage to gradually increase from a first amplitude voltage to a second amplitude voltage. Based on the negative voltage, the motor's carbon brushes rotate in reverse, causing the motor's output voltage to gradually decrease from the second amplitude voltage to the first amplitude voltage. This utility model uses a circuit structure testing method instead of the traditional time relay testing method, allowing the test voltage value to gradually and continuously increase or decrease, resulting in a smooth voltage change and preventing damage to the internal circuit board components of the voltage regulator product due to sudden high voltage.

Description

Technical Field

[0001] This utility model relates to the field of aging testing technology, and specifically to an aging testing device. Background Technology

[0002] Since voltage regulators may experience sudden increases or decreases in voltage during use, they must undergo aging tests before leaving the factory to cope with the constantly changing voltage conditions. This involves simulating the aging process caused by various factors in real-world use.

[0003] Current aging tests for voltage regulators typically use time-relay controlled regulators. Due to the automatic control of the time relay, during the test, at certain time points, such as when testing the voltage regulator's X1 value (150V) or suddenly jumping to the voltage X2 value (220V), the fluctuation is too large. This makes it impossible to gradually and continuously test the voltage regulator, resulting in poor test stability and affecting the test results. Furthermore, this control structure using time relays is complex, requires manual adjustment, has high setup costs, and is prone to failure and damage during use. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the defect of excessive test voltage fluctuation in the existing aging test device, thereby providing an aging test device.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides an aging test device, including: a test power supply, a motor, and a housing. The test power supply and the motor are both installed inside the housing. The test power supply receives AC power at its input terminal and its output terminal is connected to the power supply terminal of the motor. The test power supply is used to periodically and alternately output positive voltage and negative voltage to the motor. Based on the positive voltage, the carbon brushes of the motor rotate forward, so that the voltage output by the motor gradually increases from a first amplitude voltage to a second amplitude voltage. Based on the negative voltage, the carbon brushes of the motor rotate in reverse, so that the voltage output by the motor gradually decreases from the second amplitude voltage to the first amplitude voltage.

[0007] In one embodiment, the test power supply includes a power supply circuit and a switching circuit. The power supply circuit has its positive output terminal connected to the first input terminal of the switching circuit and its negative output terminal connected to the second input terminal of the switching circuit. It is used to transform, rectify, and regulate the input AC power and output a positive voltage and a negative voltage. The switching circuit has its output terminal connected to the power supply terminal of the motor. When the switching circuit operates according to a preset operating sequence, the positive voltage and negative voltage of the power supply circuit periodically alternate to supply power to the motor.

[0008] In one embodiment, the switching circuit includes: a selection switch circuit, a relay circuit, and a clamping circuit. The selection switch circuit has its input terminal connected to the positive output terminal of the power supply circuit, its first output terminal connected to the first power supply terminal of the relay circuit, and its second output terminal connected to the power supply terminal of the motor via the clamping circuit. The relay circuit has its first input terminal connected to the positive output terminal of the power supply circuit, its second input terminal connected to the negative output terminal of the power supply circuit, its second power supply terminal connected to the negative output terminal of the power supply circuit, and its output terminal connected to the power supply terminal of the motor. When the selection switch circuit and the relay circuit operate in a preset timing sequence, the positive and negative voltages of the power supply circuit periodically alternate to supply power to the motor.

[0009] In one embodiment, the selection switch circuit includes: a first selection switch and a second selection switch; the first selection switch has a first stationary contact connected to the first power supply terminal of the relay circuit, a second stationary contact suspended, and a moving contact connected to the power supply terminal of the motor through a clamping circuit; the second selection switch has a first stationary contact connected to the positive output terminal of the power supply circuit, a second stationary contact suspended, and a moving contact connected to the power supply terminal of the motor through a clamping circuit.

[0010] In one embodiment, the relay circuit includes: a relay; the relay having a first power supply terminal connected to a first output terminal of a selector switch circuit, a second power supply terminal connected to a negative output terminal of a power supply circuit, a first stationary contact connected to a positive output terminal of the power supply circuit, a second stationary contact connected to a positive output terminal of the power supply circuit, and a stationary contact connected to a power supply terminal of a motor.

[0011] In one embodiment, the clamping circuit includes: a clamping diode; the clamping diode having its anode connected to the power supply terminal of the motor; and its cathode connected to the output terminal of the selector switch circuit.

[0012] In one embodiment, the power supply circuit includes: a transformer circuit, a rectifier circuit, and a voltage regulator circuit connected in series; the transformer circuit receives AC power, and the voltage regulator circuit outputs a positive voltage and a negative voltage.

[0013] In one embodiment, the transformer circuit includes: a transformer; the transformer has an AC input on its primary side, and its first secondary winding and second secondary winding are connected in series and then connected to a rectifier circuit.

[0014] In one embodiment, the rectifier circuit includes: a first diode, a second diode, a third diode, a fourth diode, a first capacitor, and a second capacitor; the first diode has its anode connected to a first secondary winding and its cathode connected to a first input terminal of the voltage regulator circuit; the second diode has its cathode connected to the first secondary winding and its anode connected to a second input terminal of the voltage regulator circuit; the first terminal of the first capacitor is connected to the first input terminal of the voltage regulator circuit, its second terminal is connected to the connecting line of the first secondary winding and the second secondary winding, and its second terminal is also connected to a first ground terminal of the voltage regulator circuit; the third diode has its anode connected to the second secondary winding and its cathode connected to the second input terminal of the voltage regulator circuit; the fourth diode has its cathode connected to the second secondary winding and its anode connected to the first input terminal of the voltage regulator circuit; the first terminal of the second capacitor is connected to the second input terminal of the voltage regulator circuit, its second terminal is connected to the connecting line of the first secondary winding and the second secondary winding, and its second terminal is also connected to a first ground terminal of the voltage regulator circuit.

[0015] In one embodiment, the voltage regulator circuit includes: a first voltage regulator and a second voltage regulator; the first voltage regulator has its input terminal connected to the cathode of a first diode, the cathode of a third diode, and the first terminal of a first capacitor, its output terminal outputting a positive voltage, and its ground terminal connected to the second terminal of the first capacitor and the second terminal of the second capacitor, and its ground terminal is grounded; the second voltage regulator has its input terminal connected to the anode of a second diode, the anode of a fourth diode, and the first terminal of a second capacitor, its output terminal outputting a negative voltage, and its ground terminal is grounded.

[0016] The technical solution of this utility model has the following advantages:

[0017] The aging test device provided by this utility model includes: a test power supply, a motor, and a housing. Both the test power supply and the motor are installed inside the housing. The test power supply receives AC power at its input terminal and its output terminal is connected to the power supply terminal of the motor. The test power supply periodically and alternately outputs positive and negative voltages to the motor. Based on the positive voltage, the motor's carbon brushes rotate forward, causing the motor's output voltage to gradually increase from a first amplitude voltage to a second amplitude voltage. Based on the negative voltage, the motor's carbon brushes rotate in reverse, causing the motor's output voltage to gradually decrease from the second amplitude voltage to the first amplitude voltage. This utility model uses a circuit structure testing method instead of the traditional time relay testing method, allowing the test voltage value to gradually and continuously increase or decrease, resulting in a smooth voltage change and preventing damage to the internal circuit board components of the voltage regulator product due to sudden high voltage. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A composition diagram of a specific example of the aging test apparatus provided in an embodiment of this utility model;

[0020] Figure 2 A structural diagram of a specific example of the aging test apparatus provided in an embodiment of this utility model;

[0021] Figure 3 A structural diagram of another specific example of the aging test apparatus provided in this embodiment of the utility model;

[0022] Figure 4 A composition diagram of another specific example of the aging test apparatus provided in this utility model embodiment;

[0023] Figure 5 A composition diagram of another specific example of the aging test apparatus provided in this utility model embodiment;

[0024] Figure 6 The specific circuit topology of the test power supply provided in the embodiments of this utility model. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] Example

[0030] This utility model embodiment provides an aging test device, such as Figure 1 As shown, it includes: a test power supply 1, a motor 2, and a housing 3, as follows. Figure 2 As shown, the test power supply 1 and the motor 2 are both installed inside the housing 3. Figure 2 Only motor 2 is shown in the drawing, but the test power supply 1 is actually placed inside the housing 3.

[0031] like Figure 1 As shown, test power supply 1 receives AC power at its input terminal and its output terminal is connected to the power supply terminal of motor 2. It is understood that the housing 3 has a power port and a test port. The power port is used to connect an external power source to the input terminal of test power supply 1, or the test port is used to connect the voltage output from motor 2 to the device under test (e.g., a voltage regulator).

[0032] It should be noted that there are multiple power ports, and each power port is connected to an external power supply with a different voltage amplitude.

[0033] Test power supply 1 is used to periodically and alternately output positive and negative voltages to motor 2. The positive and negative voltages have the same amplitude. Based on the positive voltage, the carbon brushes of motor 2 rotate forward, so that the voltage output by motor 2 gradually increases from the first amplitude voltage to the second amplitude voltage. Based on the negative voltage, the carbon brushes of motor 2 rotate in reverse, so that the voltage output by motor 2 gradually decreases from the second amplitude voltage to the first amplitude voltage.

[0034] like Figure 3 As shown, a display device is installed on the housing 3, which can display the current output voltage and the operating status of the aging test device.

[0035] In one specific embodiment, such as Figure 4 As shown, the test power supply 1 includes: a power supply circuit 11 and a switching circuit 12, wherein,

[0036] The power supply circuit 11 has its positive output terminal connected to the first input terminal of the switching circuit 12 and its negative output terminal connected to the second input terminal of the switching circuit 12. It is used to transform, rectify and regulate the input AC power and output positive and negative voltages.

[0037] The output terminal of the switching circuit 12 is connected to the power supply terminal of the motor 2;

[0038] When the switching circuit 12 operates in a preset timing sequence, the positive and negative voltages of the power supply circuit 11 periodically alternate to supply power to the motor 2. That is, the switching circuit 12 operates in a preset timing sequence so that the positive and negative output terminals of the power supply circuit 11 are periodically and alternately connected to the power supply terminal of the motor 2, thereby causing the motor 2 to periodically and alternately rotate forward and reverse.

[0039] In one specific embodiment, such as Figure 5 As shown, the switching circuit 12 includes: a selection switch circuit 121, a relay circuit 122, and a clamping circuit 123.

[0040] Specifically, such as Figure 1 As shown, the selection switch circuit 121 has its input terminal connected to the positive output terminal of the power supply circuit 11, its first output terminal connected to the first power supply terminal of the relay circuit 122, and its second output terminal connected to the power supply terminal of the motor 2 through the clamping circuit 123.

[0041] Specifically, such as Figure 1 As shown, the relay circuit 122 has its first input terminal connected to the positive output terminal of the power supply circuit 11, its second input terminal connected to the negative output terminal of the power supply circuit 11, its second power supply terminal connected to the negative output terminal of the power supply circuit 11, and its output terminal connected to the power supply terminal of the motor 2.

[0042] Specifically, when the selector switch circuit 121 and relay circuit 122 operate in a preset timing sequence, the positive and negative voltages of the power supply circuit 11 periodically alternate to supply power to the motor 2.

[0043] Specifically, when the selector switch circuit 121 and the relay circuit 122 are in different operating states, the positive voltage of the power supply circuit 11 supplies power to the motor 2 through the relay circuit 122, or the negative voltage of the power supply circuit 11 supplies power to the motor 2 through the relay circuit 122. When the positive voltage supplies power to the motor 2, the motor 2 rotates in the forward direction, and when the negative voltage supplies power to the motor 2, the motor 2 rotates in the reverse direction.

[0044] Specifically, when the selector switch circuit 121 is in different operating states, the relay circuit 122 is either energized or de-energized. When the input terminal of the selector switch circuit 121 is connected to the first output terminal, the positive terminal of the power supply circuit 11 is connected to the first power supply terminal of the relay circuit 122, at which time the relay circuit 122 is energized and self-locks after being energized; when the relay circuit 122 is energized and the input terminal of the selector switch circuit 121 is connected to the second output terminal again, the positive terminal of the power supply circuit 11 is connected to the clamping circuit 123, at which time the relay circuit 122 is de-energized.

[0045] Specifically, the relay circuit 122 outputs voltages of different polarities when it is in different operating states. When the relay circuit 122 is energized, its first input terminal is connected to its output terminal, and the positive terminal of the power supply circuit 11 is connected to the motor 2 through the relay circuit 122, supplying power to the motor 2. When the relay circuit 122 is de-energized, its second input terminal is connected to its output terminal, and the negative terminal of the power supply circuit 11 is connected to the motor 2 through the relay circuit 122, supplying power to the motor 2.

[0046] Specifically, based on the above analysis, by controlling the operating states of the selection switch circuit 121 and the relay circuit 122, the positive and negative voltages are alternately and periodically supplied to the motor 2. The control methods for the selection switch circuit 121 and the relay circuit 122 can be methods commonly used in the prior art, and are not limited here.

[0047] In one specific embodiment, such as Figure 6 As shown, the clamping circuit 123 includes: a clamping diode VD1; the anode of the clamping diode VD1 is connected to the power supply terminal of the motor 2; and its cathode is connected to the output terminal of the selector switch circuit 121.

[0048] In one specific embodiment, such as Figure 6 As shown, the selection switch circuit 121 includes: a first selection switch S1 and a second selection switch S2; the first selection switch S1 has its first stationary contact connected to the first power supply terminal of the relay circuit 122, its second stationary contact suspended, and its moving contact connected to the power supply terminal of the motor 2 through the clamping circuit 123; the second selection switch S2 has its first stationary contact connected to the positive output terminal of the power supply circuit 11, its second stationary contact suspended, and its moving contact connected to the power supply terminal of the motor 2 through the clamping circuit 123.

[0049] Specifically, when the first selector switch S1 and the second selector switch S2 are in different states, the relay circuit 122 is either energized or de-energized. For example... Figure 6As shown, when the power circuit 11 is turned on, touching the first selector switch S1 connects pin 1 and pin 2 of the first selector switch S1, and pins 5 and 6 of the second selector switch S2 are connected. At this time, the positive terminal of the power circuit 11 is not connected to the relay circuit 122 (pin 1 of the relay JK1), and the relay circuit 122 is in a de-energized state. When touching the second selector switch S2, pin 4 and pin 5 of the second selector switch S2 are connected, and the positive terminal of the power circuit 11 is connected to the first power supply terminal of the relay circuit 122 (pin 1 of the relay JK1), and the relay circuit 122 is in a energized state. When the relay circuit 122 is in a energized state, the relay circuit 122 self-locks, that is, regardless of whether pin 5 of the second selector switch S2 is connected to pin 4, the relay circuit 122 is always in a energized state. When the relay circuit 122 is in a energized state, touching the first selector switch S1 again disconnects pin 1 and pin 2 of the first selector switch S1, and the relay circuit 122 is de-energized.

[0050] It should be noted that, for controlling the states of the first selector switch S1 and the second selector switch S2, this embodiment of the invention only requires a light touch of the switch to change the connection state of its internal contacts, without the need for continuous pressing. That is, when the power circuit 11 is energized, touching the first selector switch S1 activates the relay's self-locking circuit (motor 2 rotates forward). Motor 2 can rotate forward continuously without requiring manual pressing of the first selector switch S1. If unlocking (motor 2 reverses) is required, simply touch the second selector switch S2; it also does not need to be continuously pressed. This embodiment of the invention has self-locking and unlocking functions, and enables the switching of motor 2 between forward and reverse rotation without requiring continuous manual pressing of the selector switches.

[0051] In one specific embodiment, such as Figure 6 As shown, the relay circuit 122 includes: a relay JK1; the relay JK1 has its first power supply terminal (pin 1) connected to the first output terminal (pin 1 of the first selector switch S1) of the selector switch circuit 121, its second power supply terminal (pin 2) connected to the negative output terminal (VOUT terminal of the second voltage regulator V2) of the power supply circuit 11, its first stationary contact (pin 5) connected to the positive output terminal (VOUT terminal of the first voltage regulator V1) of the power supply circuit 11, its second stationary contact (pin 4) connected to the negative output terminal (VOUT terminal of the second voltage regulator V2) of the power supply circuit 11, and its stationary contact (pin 3) connected to the power supply terminal of the motor 2.

[0052] Specifically, when relay JK1 is in different states, the positive voltage or the negative voltage of power supply circuit 11 supplies power to motor 2. When relay JK1 is energized, relay JK1 is energized, and its pin 3 is connected to its pin 5, so the positive voltage of power supply circuit 11 supplies power to motor 2 through relay JK1; when relay JK1 is de-energized, relay JK1 is not energized, and its pin 3 is connected to its pin 4, so the negative voltage of power supply circuit 11 supplies power to motor 2 through relay JK1.

[0053] Based on the above analysis, it can be seen that by controlling the operating state of the first selector switch S1 and the second selector switch S2, the relay JK1 is alternately in the on and off state, thereby causing the positive voltage and negative voltage to alternately supply power to the motor 2, so that the motor 2 can periodically switch between forward and reverse rotation.

[0054] In one specific embodiment, the power supply circuit 11 includes: a transformer circuit, a rectifier circuit, and a voltage regulator circuit connected in series; the transformer circuit receives AC power, and the voltage regulator circuit outputs a positive voltage and a negative voltage.

[0055] In one specific embodiment, such as Figure 6 As shown, the transformer circuit includes: transformer T1; transformer T1, whose primary side is input with AC power, and whose first secondary winding and second secondary winding are connected in series and then connected to the rectifier circuit.

[0056] In one specific embodiment, such as Figure 6 As shown, the rectifier circuit includes: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first capacitor C1, and a second capacitor C2.

[0057] Specifically, such as Figure 6As shown, the first diode D1 has its anode connected to the first secondary winding and its cathode connected to the first input terminal of the voltage regulator circuit (VIN terminal of the first voltage regulator V1); the second diode D2 has its cathode connected to the first secondary winding and its anode connected to the second input terminal of the voltage regulator circuit (VIN terminal of the first voltage regulator V1); the first terminal of the first capacitor C1 is connected to the first input terminal of the voltage regulator circuit (VIN terminal of the first voltage regulator V1), its second terminal is connected to the connecting line of the first secondary winding and the second secondary winding, and its second terminal is also connected to the first ground terminal of the voltage regulator circuit (GND terminal of the first voltage regulator V1). The third diode D3 has its anode connected to the second secondary winding and its cathode connected to the second input terminal of the voltage regulator circuit (VIN terminal of the second voltage regulator V2); the fourth diode D4 has its cathode connected to the second secondary winding and its anode connected to the first input terminal of the voltage regulator circuit (VIN terminal of the first voltage regulator V1); the first terminal of the second capacitor C2 is connected to the second input terminal of the voltage regulator circuit (VIN terminal of the second voltage regulator V2), its second terminal is connected to the connecting line of the first secondary winding and the second secondary winding respectively, and its second terminal is also connected to the first ground terminal of the voltage regulator circuit (GND terminal of the first voltage regulator V1).

[0058] In one specific embodiment, such as Figure 6 As shown, the voltage regulator circuit includes a first voltage regulator V1 and a second voltage regulator V2.

[0059] Specifically, such as Figure 6 As shown, the first voltage regulator V1 has its input terminal connected to the cathode of the first diode D1, the cathode of the third diode D3, and the first terminal of the first capacitor C1. Its output terminal outputs a positive voltage, and its ground terminal is connected to the second terminal of the first capacitor C1 and the second terminal of the second capacitor C2. Its ground terminal is grounded. The second voltage regulator V2 has its input terminal connected to the anode of the second diode D2, the anode of the fourth diode D4, and the first terminal of the second capacitor C2. Its output terminal outputs a negative voltage, and its ground terminal is grounded.

[0060] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An aging test apparatus characterized by comprising: include: The test power supply, motor, and housing are included, with the test power supply and motor both installed inside the housing. The test power supply is connected to AC power at its input terminal and its output terminal is connected to the power supply terminal of the motor. The test power supply is used to periodically and alternately output positive and negative voltages to the motor; Based on the positive voltage, the carbon brushes of the motor rotate in the forward direction, so that the voltage output by the motor gradually increases from the first amplitude voltage to the second amplitude voltage; Based on the negative voltage, the carbon brushes of the motor reverse, so that the voltage output by the motor gradually decreases from the second amplitude voltage to the first amplitude voltage.

2. The aging test apparatus of claim 1, wherein The test power supply includes: a power supply circuit and a switching circuit, wherein... The power supply circuit has its positive output terminal connected to the first input terminal of the switching circuit and its negative output terminal connected to the second input terminal of the switching circuit. It is used to transform, rectify, and regulate the input AC power and output positive and negative voltages. A switching circuit, the output of which is connected to the power supply terminal of the motor; When the switching circuit operates according to a preset timing sequence, the positive and negative voltages of the power supply circuit periodically alternate to supply power to the motor.

3. The aging test apparatus of claim 2, wherein The switching circuit includes: a selection switch circuit, a relay circuit, and a clamping circuit, wherein... The selector switch circuit has its input terminal connected to the positive output terminal of the power supply circuit, its first output terminal connected to the first power supply terminal of the relay circuit, and its second output terminal connected to the power supply terminal of the motor through the clamping circuit. The relay circuit has its first input terminal connected to the positive output terminal of the power supply circuit, its second input terminal connected to the negative output terminal of the power supply circuit, its second power supply terminal connected to the negative output terminal of the power supply circuit, and its output terminal connected to the power supply terminal of the motor. When the selection switch circuit and the relay circuit operate in a preset action sequence, the positive and negative voltages of the power supply circuit periodically alternate to supply power to the motor.

4. The aging test apparatus of claim 3, wherein The selection switch circuit includes: First selector switch and second selector switch; The first selector switch has a first stationary contact connected to the first power supply terminal of the relay circuit, a second stationary contact suspended, and a moving contact connected to the power supply terminal of the motor through the clamping circuit. The second selector switch has its first stationary contact connected to the positive output terminal of the power supply circuit, its second stationary contact suspended, and its moving contact connected to the power supply terminal of the motor through the clamping circuit.

5. The aging test apparatus of claim 3, wherein The relay circuit includes: Relay; The relay has its first power supply terminal connected to the first output terminal of the selector switch circuit, its second power supply terminal connected to the negative output terminal of the power supply circuit, its first stationary contact connected to the positive output terminal of the power supply circuit, its second stationary contact connected to the negative output terminal of the power supply circuit, and its stationary contact connected to the power supply terminal of the motor.

6. The aging test apparatus of claim 3, wherein The clamping circuit includes: Clamping diode; The clamping diode has its anode connected to the power supply terminal of the motor and its cathode connected to the output terminal of the selection switch circuit.

7. The aging test apparatus of claim 2, wherein The power supply circuit includes: A transformer circuit, a rectifier circuit, and a voltage regulator circuit connected in series in sequence; The transformer circuit receives AC power, and the voltage regulator circuit outputs the positive and negative voltages.

8. The aging test apparatus of claim 7, wherein The transformer circuit includes: transformer; A transformer receives alternating current on its primary side, and its first and second secondary windings are connected in series and then connected to a rectifier circuit.

9. The aging test apparatus of claim 8, wherein, The rectifier circuit includes: First diode, second diode, third diode, fourth diode, first capacitor, and second capacitor; The first diode has its anode connected to the first secondary winding and its cathode connected to the first input terminal of the voltage regulator circuit. The second diode has its cathode connected to the first secondary winding and its anode connected to the second input terminal of the voltage regulator circuit. The first end of the first capacitor is connected to the first input terminal of the voltage regulator circuit, and its second end is connected to the connecting line of the first secondary winding and the second secondary winding respectively. The second end is also connected to the first ground terminal of the voltage regulator circuit. The third diode has its anode connected to the second secondary winding and its cathode connected to the second input terminal of the voltage regulator circuit. The fourth diode has its cathode connected to the second secondary winding and its anode connected to the first input terminal of the voltage regulator circuit. The first end of the second capacitor is connected to the second input terminal of the voltage regulator circuit, and its second end is connected to the connecting line of the first secondary winding and the second secondary winding respectively. Its second end is also connected to the first ground terminal of the voltage regulator circuit.

10. The aging test apparatus of claim 9, wherein The voltage regulator circuit includes: First voltage regulator and second voltage regulator; The first voltage regulator has its input terminal connected to the cathode of the first diode, the cathode of the third diode, and the first terminal of the first capacitor. Its output terminal outputs a positive voltage, and its ground terminal is connected to the second terminal of the first capacitor and the second terminal of the second capacitor. Its ground terminal is grounded. The second voltage regulator has its input terminal connected to the anode of the second diode, the anode of the fourth diode, and the first terminal of the second capacitor. Its output terminal outputs a negative voltage, and its ground terminal is grounded.

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