Detection device based on automobile starting motor rotor

Abstract

The invention provides a detection device based on an automobile starting motor rotor, which comprises a base station, a magnetic excitation module, a first probe and an upper computer, and is characterized in that the base station is used for mounting and fixing a to-be-detected rotor; the magnetic excitation module is used for providing an alternating magnetic field in gradient distribution along the circumferential direction of the mounting position of the to-be-detected rotor, so that rotor coils in each area of the to-be-detected rotor can induce different induced potentials under the action of the alternating magnetic field; the first probes are sequentially coupled to commutator segments of an armature of a to-be-tested rotor according to a preset numbering sequence. And the upper computer processes and judges whether the corresponding connection state of each rotor coil of the to-be-detected rotor and each commutator segment of the armature is normal or not according to the induced potential collected by each first probe. The detection device based on the automobile starting motor rotor can automatically detect the corresponding connection state of each rotor coil of the to-be-detected rotor and each commutator segment of the armature, the to-be-detected rotor does not need to be manually rotated, and the detection efficiency can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile starting motors, and in particular to a detection device based on an automobile starting motor rotor. Background Art

[0002] The starter is mainly used to drive the engine flywheel to rotate to start the engine, and is a key component of the car.

[0003] Therefore, after the starter is manufactured, various performance tests of the starter are required to meet the installation requirements of the OEM, especially the core component of the starter - the rotor, which needs to undergo armature turn-to-turn short-circuit and withstand voltage tests. In the existing technology, component suppliers often manually rotate the armature to perform link detection, and manual operation is inefficient and unsafe. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a detection device based on the automobile starter motor rotor to solve the problems of low detection efficiency and poor safety of the starter motor rotor in the prior art.

[0005] The present invention provides a detection device based on the rotor of an automobile starter motor, the detection device comprising: a base, a magnetic excitation module, a first probe and a host computer, wherein:

[0006] The base is provided with a rotor installation position to be tested, which is used for installing and fixing the rotor to be tested;

[0007] The magnetic excitation module includes a magnetic excitation drive unit and an excitation coil fixed on the base, wherein the excitation coil is arranged in a plurality of groups along the circumferential direction of the installation position of the rotor to be measured, and under the drive of the magnetic excitation drive unit, the excitation coil provides a gradient-distributed alternating magnetic field along the circumferential direction of the installation position of the rotor to be measured, so that the rotor coils in various regions of the rotor to be measured induce induced potentials of different magnitudes under the action of the alternating magnetic field;

[0008] The first probe is provided in plurality and is used to be sequentially coupled to each commutator segment of the armature of the rotor to be tested according to a preset numbering sequence;

[0009] The host computer is used to obtain a target characteristic curve of the potential difference between adjacent commutator segments based on the induced potential collected by each of the first probes, and compare the target characteristic curve with a preset standard characteristic curve to determine whether the corresponding connection status of each rotor coil of the rotor to be tested and each commutator segment of the armature is normal based on the comparison result.

[0010] Optionally, the detection device also includes a resonance detection module, which is used to provide a target resonance excitation signal to the armature of the rotor to be tested, and to collect the target resonance characteristics of the rotor to be tested under the excitation of the target resonance signal, so as to obtain performance indicators of the rotor to be tested based on the target resonance characteristics, and the performance indicators include turn-to-turn short circuit conditions and flux gap balance conditions.

[0011] Optionally, the resonance detection module is connected to a first DC power supply, and the resonance detection module includes:

[0012] Two second probes, a fourth capacitor is connected between the two second probes, a first end of the fourth capacitor is connected to the positive end of the first DC power supply, and a second end of the fourth capacitor is connected to the negative end of the first DC power supply through a switch tube;

[0013] A ring oscillator circuit, wherein a start end of the ring oscillator circuit is connected to the positive end of the first DC power supply, and an output end of the ring oscillator circuit is connected to the control end of the switch tube;

[0014] a sampling circuit, the sampling circuit being connected to the second end of the fourth capacitor and being used for collecting the target resonance characteristic and providing the target resonance characteristic to a resonance characteristic analyzer so as to obtain the performance index through the resonance characteristic analyzer;

[0015] The two second probes are used to be coupled to the corresponding armatures of the rotor to be tested, so as to provide the target resonance excitation signal to the coils between the corresponding armatures.

[0016] Optionally, the ring oscillator circuit includes a first or non-logic unit, a second or non-logic unit and a third or non-logic unit connected in series in sequence, an input end of the first or non-logic unit is connected to the positive end of the first DC power supply, an output end of the third or non-logic unit is connected to the control end of the switch tube through a third capacitor, and the control end of the switch tube is also connected to the negative end of the first DC power supply through a second resistor, wherein a second capacitor and a first resistor are also connected in series in sequence between the output end and the input end of the second or non-logic unit, and the first resistor includes a variable resistor.

[0017] Optionally, the ring oscillator circuit further includes a fourth OR logic unit, and the fourth OR logic unit is connected in parallel with the third OR logic unit.

[0018] Optionally, a first capacitor is further connected between two ends of the first DC power supply.

[0019] 7. The detection device based on the rotor of the automobile starter motor according to claim 3 is characterized in that the sampling circuit comprises:

[0020] a first diode, wherein an anode of the first diode is connected to the negative terminal of the first DC power supply, and a cathode of the first diode is connected to the second terminal of the fourth capacitor;

[0021] a fifth capacitor connected between the second end of the fourth capacitor and the negative end of the first DC power supply;

[0022] A sixth capacitor and a third resistor, wherein the first end of the third resistor is connected to the second end of the fourth capacitor through the sixth capacitor, and the second end of the third resistor is connected to the resonance characteristics analyzer, so that the resonance characteristics analyzer obtains the target resonance characteristics between the second end of the third resistor and the negative end of the first DC power supply.

[0023] Optionally, the detection device further comprises a rotation driving module, and the rotation driving module is used to drive the rotor to be detected to rotate relative to the base.

[0024] Optionally, the rotation drive module includes a second DC power supply, an AC power supply, a switching switch and a drive motor, the drive motor is used to drive the rotor to be measured to rotate, and the switching switch is used to select one of the second DC power supply and the AC power supply as the drive power supply of the drive motor according to the drive target, wherein when the braking of the drive target stops, the switching switch switches the drive power supply from the AC power supply to the second DC power supply.

[0025] The detection device based on the automobile starter motor rotor provided by the present invention comprises: a base, a magnetic excitation module, a first probe and a host computer, wherein a rotor installation position to be tested is arranged on the base, which is used for installing and fixing the rotor to be tested; the magnetic excitation module comprises a magnetic excitation drive unit and an excitation coil fixed on the base, and a plurality of excitation coils are arranged along the circumferential direction of the rotor installation position to be tested, and under the drive of the magnetic excitation drive unit, the excitation coil provides a gradient-distributed alternating magnetic field along the circumferential direction of the rotor installation position to be tested, so that the rotor coils in various areas of the rotor to be tested induce induced potentials of different sizes under the action of the alternating magnetic field; a plurality of first probes are arranged, which are used to be sequentially coupled to the rotor to be tested in a preset numbering order. Each commutator segment of the armature; the upper computer is used to obtain the target characteristic curve of the potential difference of each adjacent commutator segment according to the induced potential collected by each first probe, and compare the target characteristic curve with the preset standard characteristic curve, so as to judge whether the corresponding connection state of each rotor coil of the rotor to be tested and each commutator segment of the armature is normal according to the comparison result. When the corresponding connection state of each rotor coil of the rotor to be tested and each commutator segment of the armature is consistent, the target characteristic curve and the standard characteristic curve basically coincide. When the corresponding connection state of each rotor coil of the rotor to be tested and each commutator segment of the armature is offset, the target characteristic curve and the standard characteristic curve are synchronously offset, and the misalignment amount of the rotor coil and the armature commutator segment can be confirmed according to the offset. The detection device based on the automobile starter motor rotor provided by the present invention fixes each first probe to each commutator segment one by one, starts the magnetic excitation module, and can automatically detect the corresponding connection state of each rotor coil of the rotor to be tested and each commutator segment of the armature, without manually rotating the rotor to be tested, which can effectively improve the detection efficiency, reduce the contact between personnel and electrical components, and improve the detection safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a partial structural schematic diagram of a detection device in an embodiment of the present invention;

[0027] Figure 2 is a characteristic curve obtained by the detection device in an embodiment of the present invention in an example;

[0028] Figure 3 is a schematic structural diagram of a resonance detection module of a detection device in an embodiment of the present invention;

[0029] Figure 4 is a schematic structural diagram of a rotation drive module of a detection device in an embodiment of the present invention;

[0030] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] To solve the problems of low efficiency and poor safety in detecting the rotor of the starting motor in the prior art. The present invention provides a detection device based on the rotor of the automobile starting motor, which includes a base, a magnetic excitation module, a first probe and a host computer, wherein a rotor mounting position to be tested is provided on the base for installing and fixing the rotor to be tested; the magnetic excitation module includes a magnetic excitation drive unit and an excitation coil fixed on the base, and multiple groups of excitation coils are provided along the circumferential direction of the rotor mounting position to be tested, and under the drive of the magnetic excitation drive unit, the excitation coil provides a gradient-distributed alternating magnetic field along the circumferential direction of the rotor mounting position to be tested, so that the rotor coils in each area of ​​the rotor to be tested induce induced potentials of different magnitudes under the action of the alternating magnetic field; multiple first probes are provided, which are used to be sequentially coupled to each commutator segment of the armature of the rotor to be tested in a preset numbering order; the host computer is used to obtain a target characteristic curve of the potential difference of each adjacent commutator segment according to the induced potential collected by each first probe, and the target characteristic curve is converted into a target characteristic curve. It is compared with the preset standard characteristic curve to determine whether the corresponding connection states of each rotor coil of the rotor to be tested and each commutator segment of the armature are normal according to the comparison result. When the corresponding connection states of each rotor coil of the rotor to be tested and each commutator segment of the armature are consistent, the target characteristic curve and the standard characteristic curve basically coincide with each other. When the corresponding connection states of each rotor coil of the rotor to be tested and each commutator segment of the armature are offset, the target characteristic curve and the standard characteristic curve are synchronously offset, and the misalignment amount of the rotor coil and the armature commutator segment can be confirmed according to the offset. During the test, each first probe is fixed to each commutator segment one by one, and the magnetic excitation module is started. The upper computer can automatically detect the corresponding connection states of each rotor coil of the rotor to be tested and each commutator segment of the armature. There is no need to manually rotate the rotor to be tested, which can effectively improve the detection efficiency, reduce the contact between personnel and electrical components, and improve the detection safety.

[0035] Specifically, Figure 1 As shown, a rotor installation position to be tested is provided on the base 10 for installing and fixing the rotor 01 to be tested, and the magnetic excitation module includes a magnetic excitation drive unit 22 and an excitation coil 21 fixed on the base 10. The excitation coil 21 is provided with multiple groups (not fully shown in the figure) along the circumference of the rotor installation position to be tested, and under the drive of the magnetic excitation drive unit 22, the excitation coil 21 provides a gradient-distributed alternating magnetic field along the circumference of the rotor installation position to be tested, so that the rotor coils in each area of ​​the rotor 01 to be tested induce different induced potentials under the action of the alternating magnetic field, wherein the gradient distribution requirement of the provided alternating magnetic field can be achieved by adjusting the number of coil turns of each excitation coil 21, and the magnetic excitation drive unit 22 is mainly used to provide an alternating current, which can be input into each excitation coil 21 to excite the alternating magnetic field. For example, a linearly changing current can be provided, which can stabilize the induced potential of each coil and facilitate data collection.

[0036] There are a plurality of first probes 20 (not fully shown in the figure), which are used to be sequentially coupled to the commutator segments of the armature of the rotor 01 to be tested according to a preset numbering sequence.

[0037] The host computer 23 is used to obtain the target characteristic curve of the potential difference of each adjacent commutator segment according to the induced potential collected by each first probe 23, and compare the target characteristic curve with the preset standard characteristic curve to determine whether the corresponding connection status of each rotor coil of the rotor to be tested and each commutator segment of the armature is normal according to the comparison result.

[0038] Among them, Figure 2 As shown in FIG. 1 , it is the collected data in a specific example, wherein the solid line and the dotted line are the standard characteristic curve and the target characteristic curve, respectively. Figure 2 From the data, we can see that the standard characteristic curve and the target characteristic curve have a numbered step offset, that is, the connection sequence of each coil to each commutator segment of the rotor to be tested is misaligned during production, and it is offset by one position. When it is repaired, it can be corrected by adjusting the whole by one position. Among them, the ordinate is the potential difference between the first probe and the previous or next numbered probe. In practice, one of the rules can be uniformly selected.

[0039] In order to increase the inspection range, in this embodiment, the detection device also includes a resonance detection module, which is used to provide a target resonance excitation signal to the armature of the rotor 01 to be tested, and collect the target resonance characteristics of the rotor 01 to be tested under the excitation of the target resonance signal, so as to obtain the performance indicators of the rotor to be tested according to the target resonance characteristics, and the performance indicators include the inter-turn short circuit situation and the flux gap balance situation. Among them, for example, when a short circuit or an open circuit occurs, the collected target resonance characteristics will show obvious mutations, and it can be judged whether the electrical connection of the inter-turn coil is normal according to the mutation situation.

[0040] As a specific example, in this embodiment, Figure 3 As shown, the resonance detection module is connected to the first DC power supply DC1, and the resonance detection module is provided with two second probes 31, a fourth capacitor C4 is connected between the two second probes, a first end of the fourth capacitor C4 is connected to the positive end of the first DC power supply DC1, and a second end of the fourth capacitor C4 is connected to the negative end of the first DC power supply DC through a switch tube Q1.

[0041] A ring oscillator circuit is also provided, wherein the start end of the ring oscillator circuit is connected to the positive end of the first DC power supply DC1, and the output end of the ring oscillator circuit is connected to the control end of the switch tube Q1, providing an oscillation signal of 150Hz to 250Hz to the control end of the switch tube Q1, thereby controlling the second end of the fourth capacitor C4 to be periodically grounded, and providing a target resonance excitation signal output of a corresponding frequency between the two second probes 31.

[0042] The two second probes 31 are coupled to the armature of the rotor 01 to be tested, and the target resonance excitation signal is input into the coil between the corresponding commutator segments. The actual resonance condition between the two second probes 31 is the target resonance characteristic, which is related to the actual performance of the corresponding coil.

[0043] When setting a sampling circuit, the sampling circuit is connected to the second end of the fourth capacitor C4 for collecting target resonance characteristics and providing the target resonance characteristics to the resonance characteristics analyzer 30 to obtain performance indicators through the resonance characteristics analyzer 30 .

[0044] For the oscillation requirement of 150Hz to 250Hz, in the present embodiment, the ring oscillator circuit includes a first or non-logic unit 31, a second or non-logic unit 32 and a third or non-logic unit 33 which are connected in series in sequence. An input end of the first or non-logic unit 31 is connected to the positive end of the first DC power supply DC1 for starting the oscillator circuit. An output end of the third or non-logic unit 33 is connected to the control end of the switch tube Q1 through a third capacitor C3. The DC signal is filtered out by the third capacitor C3 to ensure the oscillation stability. The control end of the switch tube Q1 is also connected to the negative end of the first DC power supply DC1 through a second resistor R2, which can be used to pull down the control end of the switch tube Q1 when the output is stopped to keep the switch tube Q1 turned off.

[0045] Among them, a second capacitor C2 and a first resistor R1 are connected in series between the output end and the input end of the second OR-NOT logic unit 32. The first resistor R1 includes a variable resistor. By adjusting the resistance value of the variable resistor, the charging and discharging speed of the second capacitor can be adjusted, and then the flipping period of the second OR-NOT logic unit 32 can be adjusted to achieve the adjustment of the oscillation frequency, so that the frequency of the target resonant excitation signal can be adaptively adjusted according to the actual resonant frequency of different types of rotors to be tested, thereby improving the scope of application.

[0046] In this embodiment, the input ends of the OR-NON logic units are connected in parallel, and the actual logic function is non-logic. Compared with the non-logic unit, the OR-NON logic unit has more trigger channels, which can improve the reliability of its non-logic function and reduce the impact of hardware failures on the reliability of the ring oscillator circuit.

[0047] To further improve the reliability of the ring oscillator circuit, in this embodiment, a fourth OR-NOT logic unit 34 is further provided, and the fourth OR-NOT logic unit 34 is connected in parallel with the third OR-NOT logic unit 33, which can improve the stability of the output target resonance excitation signal.

[0048] At the power supply end, a first capacitor C1 is further connected between the two ends of the first DC power supply DC1, which can improve the voltage stability of the output DC, thereby improving the operating reliability of the resonance detection module.

[0049] The sampling circuit is provided with a first diode D1, the anode of the first diode D1 is connected to the negative end of the first DC power supply DC1, and the cathode of the first diode D1 is connected to the second end of the fourth capacitor C4. When an overvoltage fault occurs, the first diode D1 can be reversely broken down as a current discharge path to avoid damage to the rotor to be measured and the resonance detection module due to overcurrent.

[0050] The sampling circuit is also provided with a fifth capacitor C5, which is connected between the second end of the fourth capacitor C4 and the negative end of the first DC power supply DC1; and a sixth capacitor C6 and a third resistor R3, the first end of the third resistor R3 is connected to the second end of the fourth capacitor C4 through the sixth capacitor C6, and the second end of the third resistor R3 is connected to the resonance characteristics analyzer 30, so that the resonance characteristics analyzer obtains the target resonance characteristics between the second end of the third resistor R3 and the negative end of the first DC power supply DC1.

[0051] To further improve the detection range, in the embodiment, the detection device also includes a rotation drive module, which is used to drive the rotor 01 to be tested to rotate relative to the base 10, so as to perform dynamic performance tests on the rotor, such as testing parameters such as impedance and inductance of the rotor during rotation.

[0052] Specifically, Figure 4 As shown, the rotation drive module includes a second DC power supply DC2, an AC power supply AC1, a switching switch 42 and a driving motor 41, wherein the driving motor 41 is used to drive the rotor to be tested to rotate, and the switching switch 42 is used to select one of the second DC power supply DC2 and the AC power supply AC1 as the driving power supply of the driving motor according to the driving target, wherein, when the driving target is braked to stop, the switching switch 42 switches the driving power supply from the AC power supply AC1 to the second DC power supply DC2, which can quickly control the driving motor 41 to brake and stop, and compared with the deceleration stop scheme in the prior art, the braking stop speed can be increased, thereby improving the test efficiency.

[0053] The detection device based on the automobile starter motor rotor provided by the present invention can automatically perform various rotor performance tests, improve detection efficiency, and can effectively reduce manual electrical contact with the rotor, thereby improving detection safety.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0055] The above-mentioned embodiments only express several specific implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A detection device based on the rotor of an automobile starting motor, characterized in that: The detection device comprises: a base, a magnetic excitation module, a first probe and a host computer, wherein: The base is provided with a rotor installation position to be tested, which is used for installing and fixing the rotor to be tested; The magnetic excitation module includes a magnetic excitation drive unit and an excitation coil fixed on the base, wherein the excitation coil is arranged in a plurality of groups along the circumferential direction of the installation position of the rotor to be measured, and under the drive of the magnetic excitation drive unit, the excitation coil provides a gradient-distributed alternating magnetic field along the circumferential direction of the installation position of the rotor to be measured, so that the rotor coils in various regions of the rotor to be measured induce induced potentials of different magnitudes under the action of the alternating magnetic field; The first probe is provided in plurality and is used to be sequentially coupled to each commutator segment of the armature of the rotor to be tested according to a preset numbering sequence; The host computer is used to obtain a target characteristic curve of the potential difference between adjacent commutator segments based on the induced potential collected by each of the first probes, and compare the target characteristic curve with a preset standard characteristic curve to determine whether the corresponding connection status of each rotor coil of the rotor to be tested and each commutator segment of the armature is normal based on the comparison result.

2. The detection device based on the automobile starting motor rotor according to claim 1 is characterized in that: The detection device also includes a resonance detection module, which is used to provide a target resonance excitation signal to the armature of the rotor to be tested, and to collect the target resonance characteristics of the rotor to be tested under the excitation of the target resonance signal, so as to obtain performance indicators of the rotor to be tested based on the target resonance characteristics, and the performance indicators include turn-to-turn short circuit conditions and flux gap balance conditions.

3. The detection device based on the automobile starter motor rotor according to claim 2 is characterized in that: The resonance detection module is connected to a first DC power supply, and the resonance detection module includes: Two second probes, a fourth capacitor is connected between the two second probes, a first end of the fourth capacitor is connected to the positive end of the first DC power supply, and a second end of the fourth capacitor is connected to the negative end of the first DC power supply through a switch tube; A ring oscillator circuit, wherein a start end of the ring oscillator circuit is connected to the positive end of the first DC power supply, and an output end of the ring oscillator circuit is connected to the control end of the switch tube; a sampling circuit, the sampling circuit being connected to the second end of the fourth capacitor and being used for collecting the target resonance characteristic and providing the target resonance characteristic to a resonance characteristic analyzer so as to obtain the performance index through the resonance characteristic analyzer; The two second probes are used to be coupled to the corresponding armatures of the rotor to be tested, so as to provide the target resonance excitation signal to the coils between the corresponding armatures.

4. The detection device based on the automobile starter motor rotor according to claim 3 is characterized in that: The ring oscillator circuit includes a first or-not logic unit, a second or-not logic unit and a third or-not logic unit which are connected in series in sequence, wherein an input end of the first or-not logic unit is connected to the positive end of the first DC power supply, and an output end of the third or-not logic unit is connected to the control end of the switch tube through a third capacitor, and the control end of the switch tube is also connected to the negative end of the first DC power supply through a second resistor, wherein a second capacitor and a first resistor are sequentially connected in series between the output end and the input end of the second or-not logic unit, and the first resistor includes a variable resistor.

5. The detection device based on the automobile starter motor rotor according to claim 4 is characterized in that: The ring oscillator circuit further includes a fourth OR logic unit, and the fourth OR logic unit is connected in parallel with the third OR logic unit.

6. The detection device based on the automobile starter motor rotor according to claim 3 is characterized in that: A first capacitor is also connected between the two ends of the first DC power supply.

7. The detection device based on the automobile starter motor rotor according to claim 3 is characterized in that: The sampling circuit comprises: a first diode, wherein an anode of the first diode is connected to the negative terminal of the first DC power supply, and a cathode of the first diode is connected to the second terminal of the fourth capacitor; a fifth capacitor connected between the second end of the fourth capacitor and the negative end of the first DC power supply; A sixth capacitor and a third resistor, wherein the first end of the third resistor is connected to the second end of the fourth capacitor through the sixth capacitor, and the second end of the third resistor is connected to the resonance characteristics analyzer, so that the resonance characteristics analyzer obtains the target resonance characteristics between the second end of the third resistor and the negative end of the first DC power supply.

8. The detection device based on the automobile starter motor rotor according to claim 1 is characterized in that: The detection device further comprises a rotation driving module, and the rotation driving module is used to drive the rotor to be detected to rotate relative to the base.

9. The detection device based on the automobile starter motor rotor according to claim 8 is characterized in that: The rotation drive module includes a second DC power supply, an AC power supply, a switching switch and a drive motor, wherein the drive motor is used to drive the rotor to be measured to rotate, and the switching switch is used to select one of the second DC power supply and the AC power supply as the drive power supply of the drive motor according to a drive target, wherein when the braking of the drive target stops, the switching switch switches the drive power supply from the AC power supply to the second DC power supply.

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