Detection method of direct current brushless motor

Abstract

The invention provides a method for detecting a direct current brushless motor, and the method comprises the steps: employing a rotor assembly detection device to detect the height between the end face of a rotor shaft of a test motor and the bottom of an end cover, and detecting the distance between the end face of the rotor shaft of the test motor and a clamp spring assembled on the rotor shaft; a load supply mechanism of the motor load performance detection device is adopted to provide a corresponding load for test motor load detection, and the rotation direction of a rotor of the test motor is detected; a load performance detection mechanism is adopted to collect and detect the working parameters of the test motor load; a motor driving mechanism of the motor noise detection device is adopted to provide power supply driving for noise detection of the test motor, and a fool-proof structure is adopted to prevent live plugging of the test motor; and a motor noise detection mechanism is adopted to carry out noise detection on the test motor driven by the motor driving mechanism. The detection efficiency of the brushless DC motor is improved, and the rejection rate of the brushless DC motor is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motor accessory detection, and more specifically, to a detection method for a brushless DC motor. Background Art

[0002] The brushless DC motor is a synchronous motor composed of a motor body and a driver, and is also a typical mechatronics product. The brushless DC motor has the advantages of a traditional DC motor, while eliminating the carbon brush and slip ring structure, and can operate at low speed and high power. It is not only small in size and light in weight, but also has good stability and high efficiency, so it is widely used in automobiles, automation, and aerospace.

[0003] Before a brushless DC motor leaves the factory, its performance needs to be tested to ensure factory quality. The brushless DC motor uses a permanent magnet as the rotor. Whether the rotor position is assembled accurately will directly affect the motor's starting and reversing performance. Therefore, detecting the motor rotor assembly position is the key to starting the brushless DC motor. In addition, motor load testing is one of the important means of evaluating motor performance. By simulating the load conditions of the motor during actual operation, the motor's performance can be comprehensively and accurately tested and evaluated.

[0004] In the performance test of brushless DC motors, the national standard has certain restrictions on the noise emission of brushless DC motors during operation. Therefore, it is required that brushless DC motors must be tested for noise before leaving the factory. First, it can detect whether the noise emission meets the standard, and second, it can detect whether there is any abnormal noise when the brushless DC motor is running. At present, in the noise detection process of brushless DC motors, when the detection is stopped, the operator cannot determine whether the brushless DC motor is powered on. The brushless DC motor is often unplugged while powered on, which makes the control board of the brushless DC motor easily damaged, thereby increasing the scrap rate of the brushless DC motor. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art and provide a detection method for a brushless DC motor, which can not only quickly and conveniently detect the rotor assembly position and load performance of the brushless DC motor, but also ensure that the brushless DC motor is not damaged during noise detection, thereby improving the efficiency of brushless DC motor detection and reducing the scrap rate of the brushless DC motor.

[0006] In order to achieve the above object, the present invention is implemented by the following technical scheme: a detection method of a brushless DC motor, characterized in that: a rotor assembly detection device, a motor load performance detection device and a motor noise detection device are provided; the motor load performance detection device includes a load supply mechanism and a load performance detection mechanism; the motor noise detection device includes a motor noise detection mechanism and a motor drive mechanism with a foolproof structure; The detection method comprises: using a rotor assembly detection device to detect the height between the rotor shaft end face of the test motor and the bottom of the end cover, and detecting the distance between the rotor shaft end face of the test motor and the retaining spring assembled on the rotor shaft, so as to prevent the motor from flowing out due to the mixing of rotors of different sizes, the use of wrong rotor sizes or incorrect rotor assembly; The load supply mechanism of the motor load performance detection device is used to provide the corresponding load for the test motor load detection, and to detect the rotation direction of the test motor rotor; the load performance detection mechanism is used to collect and detect the parameters of the test motor load operation; The motor drive mechanism of the motor noise detection device provides power drive for noise detection of the test motor, and adopts an anti-fool structure to prevent the test motor from being plugged in and out while powered on; the motor noise detection mechanism is used to perform noise detection on the test motor driven by the motor drive mechanism.

[0007] In the above scheme, the detection method of the present invention can quickly detect the height between the end face of the rotor shaft and the bottom of the end cover through the rotor assembly detection device, and detect the distance between the end face of the rotor shaft and the retaining ring assembled on the rotor shaft, so as to ensure the assembly quality of the rotor shaft and prevent the mixing of rotors of different sizes, the use of incorrect rotor sizes or incorrect rotor assembly during motor assembly, resulting in the outflow of unqualified motors. The detection method of the present invention can provide a load to the test motor and perform load performance detection through the motor load performance detection device. The detection method of the present invention can detect the noise of the test motor through the motor noise detection device, and ensure that the DC brushless motor is not damaged during noise detection, thereby improving the efficiency of DC brushless motor detection and reducing the scrap rate of DC brushless motors.

[0008] The motor drive mechanism also includes a power supply with a switch, a motor drive board, a time relay and a motor connection terminal; the power supply with a switch is connected to the motor drive board and the time relay respectively, the motor drive board is connected to the motor connection terminal, and the time relay is connected to the fool-proof structure; the fool-proof structure can shield the connection point between the motor connection terminal and the connector of the test motor.

[0009] The fool-proof structure includes an electromagnetic valve, a cylinder and a baffle; the electromagnetic valve is connected to a time relay and to the cylinder; the driving end of the cylinder is connected to the baffle, and when the cylinder drives the baffle to extend, the baffle can cover the connection between the motor connection terminal and the connector of the test motor.

[0010] The motor drive mechanism also includes a light bulb, which is connected to the motor drive board and serves as a discharge resistor of the motor drive board.

[0011] The motor drive mechanism of the motor noise detection device is used to provide power drive for the noise detection of the test motor, and a foolproof structure is used to prevent the test motor from being plugged in and out while powered on; the motor noise detection mechanism is used to perform noise detection on the test motor driven by the motor drive mechanism, which means: The test motor is plugged into the motor connection terminal through the connector, the switch is turned on, the power supply energizes the motor drive board, the motor drive board drives the test motor to operate through the motor connection terminal, and the power supply also energizes the solenoid valve through the time relay. At this time, the solenoid valve is energized to control the cylinder to extend, so that the baffle is located above the plug-in point of the motor connection terminal and the connector of the test motor, so as to block the connector of the test motor to prevent the motor from being plugged in and out while it is powered on; a motor noise detection mechanism is used to perform noise detection on the running test motor; When the test motor noise detection is completed, turn off the switch and the motor drive board is powered off. At this time, the voltage in the motor drive board is discharged through the light bulb; at the same time, the time relay receives the power-off signal from the power supply and sets the power-off delay. When the set power-off delay time is reached, the solenoid valve is controlled to cut off the power and the cylinder is controlled to retract to reset the baffle. At this time, the light bulb goes out and the connector of the test motor can be unplugged.

[0012] The light bulb of the present invention can not only be used as a discharge resistor, but also has a prompting function. When the light bulb is turned off, it prompts the operator that the test motor is in a non-powered state and the connector of the test motor can be unplugged.

[0013] The power-off delay time of the time relay is equal to the discharge time of the motor drive board.

[0014] The rotor assembly detection device includes a base plate, a guide column, a shaft end limit plate and a retaining spring limit plate; the guide column is arranged on the base plate, the shaft end limit plate and the retaining spring limit plate are respectively adjustably connected to the guide column, the shaft end limit plate is located above the retaining spring limit plate, and the retaining spring limit plate is provided with a detection groove; the base plate is provided with a guide groove for facilitating the passage of the test motor, and the guide groove is provided with a clearance for the protrusion of the bottom of the end cover to pass through.

[0015] The use of a rotor assembly detection device to detect the height between the rotor shaft end face of the test motor and the bottom of the end cover, as well as the detection of the spacing between the rotor shaft end face of the test motor and the retaining spring assembled on the rotor shaft, refers to: adjusting the height of the shaft end limit plate according to the height between the rotor shaft end face of the test motor and the bottom of the end cover, and adjusting the height of the retaining spring limit plate according to the spacing between the rotor shaft end face of the test motor and the retaining spring assembled on the rotor shaft; pushing the test motor into the bottom plate through the guide groove, if the rotor shaft end face of the test motor can pass through the shaft end limit plate, and the retaining spring of the test motor can pass through the detection groove of the retaining spring limit plate, then the test motor rotor assembly is judged to be qualified, otherwise the test motor is judged to be an unqualified product.

[0016] The load supply mechanism includes a supporting bottom plate, a supporting top plate, a motor positioning plate, a load resistor with adjustable resistance, a load motor and a coupling; the supporting top plate is connected to the supporting bottom plate and is provided with a motor positioning hole, and the motor positioning plate is arranged on the supporting top plate and is located at the motor positioning hole; the load motor and the load resistor with adjustable resistance are respectively arranged on the supporting bottom plate; the UVW three-phase terminals of the stator of the load motor are respectively connected to the resistance adjusting sheet of the load resistor, and the load motor provides load force for the test motor; the rotor of the load motor is connected with a one-way bearing, and the coupling is connected to the rotor of the load motor.

[0017] The load supply mechanism of the motor load performance detection device provides a corresponding load for the test motor load detection and detects the rotation direction of the test motor rotor; the load performance detection mechanism is used to collect and detect the parameters of the test motor load work, which means: According to the load force required by the test motor, the resistance value of the load resistor connected to the load motor is adjusted through the resistance adjusting sheet to adjust the load force required by the test motor; the test motor is installed in the motor positioning hole through the motor positioning plate, and the rotor of the test motor is connected to the coupling; The test motor is powered on and runs, driving the rotor of the load motor to rotate. If the rotor of the load motor is stuck and cannot rotate, the rotation direction of the one-way bearings of the test motor and the load motor is different, and the rotor of the test motor rotates in the opposite direction, so the test motor is judged to be a failed product; If the rotor of the load motor rotates normally, the reaction force received by the rotor of the load motor when rotating and cutting the magnetic field will serve as the load force provided to the test motor. At this time, a load performance detection mechanism is used to collect and detect the load working parameters of the test motor to realize the load performance detection of the test motor.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects: the detection method of the brushless DC motor of the present invention can not only quickly and conveniently detect the rotor assembly position and load performance of the brushless DC motor, but also ensure that the brushless DC motor is not damaged during noise detection, thereby improving the efficiency of brushless DC motor detection and reducing the scrap rate of brushless DC motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The detection method of the present invention adopts the structural principle diagram of the motor driving mechanism in the motor noise detection device; Figure 2 It is a structural schematic diagram of a motor driving mechanism in a motor noise detection device used in the detection method of the present invention; Figure 3 It is a schematic diagram of the structure of a rotor assembly detection device used in the detection method of the present invention; Figure 4It is a structural schematic diagram of a load supply mechanism in a motor load performance detection device used in the detection method of the present invention; Among them, 1 is the rotor shaft, 2 is the end cover, 3 is the test motor, 4 is the retaining spring, 5 is the switch, 6 is the power supply, 7 is the motor drive board, 8 is the time relay, 9 is the motor connection terminal, 10 is the solenoid valve, 11 is the cylinder, 12 is the baffle, 13 is the bulb, 14 is the base plate, 15 is the guide column, 16 is the shaft end limit plate, 17 is the retaining spring limit plate, 17.1 is the detection groove, 18 is the fastener, 19 is the guide groove, 20 is the avoidance position, 21 is the support bottom plate, 22 is the support top plate, 23 is the motor positioning plate, 24 is the load resistor, 25 is the load motor, 26 is the coupling, 27 is the one-way bearing, 28 is the connector, and 29 is the adjustment block. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Example

[0021] like Figures 1 to 4 As shown, the detection method of the brushless DC motor of the present invention is provided with a rotor assembly detection device, a motor load performance detection device and a motor noise detection device, wherein the motor load performance detection device includes a load supply mechanism and a load performance detection mechanism, and the motor noise detection device includes a motor noise detection mechanism and a motor drive mechanism with an anti-fool structure; The detection method comprises: using a rotor assembly detection device to detect the height between the end face of the rotor shaft 1 of the test motor 3 and the bottom of the end cover 2, and detecting the distance between the end face of the rotor shaft 1 of the test motor 3 and the retaining spring 4 assembled on the rotor shaft 1, so as to prevent the motor from flowing out due to the mixing of rotors of different sizes, the use of wrong rotor sizes or incorrect rotor assembly; The load supply mechanism of the motor load performance detection device is used to provide the corresponding load for the load detection of the test motor 3, and to detect the rotation direction of the rotor of the test motor 3; the load performance detection mechanism is used to collect and detect the parameters of the load operation of the test motor 3; The motor drive mechanism of the motor noise detection device provides power drive for the test motor 3 noise detection, and adopts an anti-fool structure to prevent the test motor 3 from being plugged in and out while powered on; the motor noise detection mechanism is used to perform noise detection on the test motor 3 driven by the motor drive mechanism.

[0022] Specifically, the motor drive mechanism of the present invention further comprises a power supply 6 with a switch 5, a motor drive board 7, a time relay 8 and a motor connection terminal 9, wherein the power supply 6 with a switch 5 is respectively connected to the motor drive board 7 and the time relay 8, the motor drive board 7 is connected to the motor connection terminal 9, and the time relay 8 is connected to an anti-fool structure, which can shield the plugging place between the motor connection terminal 9 and the connector 28 of the test motor 3. The anti-fool structure comprises an electromagnetic valve 10, a cylinder 11 and a baffle 12, wherein the electromagnetic valve 10 is connected to the time relay 8 and to the cylinder 11, the driving end of the cylinder 11 is connected to the baffle 12, and when the cylinder 11 drives the baffle 12 to extend, the baffle 12 can shield the plugging place between the motor connection terminal 9 and the connector 28 of the test motor 3.

[0023] The motor drive mechanism of the present invention further comprises a light bulb 13, which is connected to the motor drive board 7 and serves as a discharge resistor of the motor drive board 7. The light bulb 13 of the present invention can not only serve as a discharge resistor, but also has a prompting function. When the light bulb 13 is off, it prompts the operator that the test motor 3 is not powered and the connector 28 of the test motor 3 can be unplugged.

[0024] The present invention adopts the motor driving mechanism of the motor noise detection device to provide power drive for the noise detection of the test motor 3, and adopts a foolproof structure to prevent the test motor 3 from being plugged in and out while powered on; adopting the motor noise detection mechanism to perform noise detection on the test motor 3 driven by the motor driving mechanism means: The test motor 3 is plugged into the motor connection terminal 9 through the connector 28, the switch 5 is turned on, the power supply 6 energizes the motor drive board 7, and the motor drive board 7 drives the test motor 3 to operate through the motor connection terminal 9. At the same time, the power supply 6 also energizes the solenoid valve 10 through the time relay 8. At this time, the solenoid valve 10 is energized to control the cylinder 11 to extend, so that the baffle 12 is located above the plugging point between the motor connection terminal 9 and the connector 28 of the test motor 3, so as to block the connector 28 of the test motor 3 to prevent the test motor 3 from being plugged in and out while it is powered on; a motor noise detection mechanism is used to perform noise detection on the running test motor 3; After the noise detection of the test motor 3 is completed, the switch 5 is closed, the motor drive board 7 is powered off, and the voltage in the motor drive board 7 is discharged through the bulb 13; at the same time, the time relay 8 receives the power-off signal of the power supply 6, and then sets the power-off delay. When the set power-off delay time is reached, the solenoid valve 10 is controlled to be powered off, and the cylinder 11 is controlled to retract so that the baffle 12 is reset. At this time, the bulb 13 is extinguished, and the connector 28 of the test motor 3 can be unplugged. The power-off delay time of the time relay 8 of the present invention is equal to the discharge time of the motor drive board 7.

[0025] The motor noise detection mechanism of this embodiment adopts the existing technology, which is a noise detection mechanism currently used for motors on the market.

[0026] The rotor assembly detection device of the present invention includes a base plate 14, a guide column 15, a shaft end limit plate 16 and a retaining spring limit plate 17, wherein the guide column 15 is arranged on the base plate 14, the shaft end limit plate 16 and the retaining spring limit plate 17 are adjustably connected to the guide column 15 through a fastener 18 and an adjustment block 29 respectively, the shaft end limit plate 16 is located above the retaining spring limit plate 17, the retaining spring limit plate 17 is provided with a detection groove 17.1, and the base plate 14 is provided with a guide groove 19 for facilitating the passage of the test motor 3, and the guide groove 19 is provided with an avoidance position 20 for the bottom protrusion of the end cover 2 to pass through.

[0027] The present invention adopts a rotor assembly detection device to detect the height between the end face of the rotor shaft 1 of the test motor 3 and the bottom of the end cover 2, and detects the distance between the end face of the rotor shaft 1 of the test motor 3 and the retaining spring 4 assembled on the rotor shaft 1, which means: adjusting the height of the shaft end limit plate 16 according to the height between the end face of the rotor shaft 1 of the test motor 3 and the bottom of the end cover 2, and adjusting the height of the retaining spring limit plate 17 according to the distance between the end face of the rotor shaft 1 of the test motor 3 and the retaining spring 4 assembled on the rotor shaft 1; pushing the test motor 3 into the bottom plate 14 through the guide groove 19, if the end face of the rotor shaft 1 of the test motor 3 can pass through the shaft end limit plate 16, and the retaining spring 4 of the test motor 3 can pass through the detection groove 17.1 of the retaining spring limit plate 17, then it is judged that the rotor assembly of the test motor 3 is qualified, otherwise it is judged that the test motor 3 is an unqualified product.

[0028] The load supply mechanism of the present invention includes a supporting bottom plate 21, a supporting top plate 22, a motor positioning plate 23, a load resistor 24 with adjustable resistance, a load motor 25 and a coupling 26, wherein the supporting top plate 22 is connected to the supporting bottom plate 21 and is provided with a motor positioning hole, the motor positioning plate 23 is arranged on the supporting top plate 22 and is located at the motor positioning hole, the load motor 25 and the load resistor 24 with adjustable resistance are respectively arranged on the supporting bottom plate 21, the UVW three-phase terminals of the stator of the load motor 25 are respectively connected to the resistance adjusting sheet of the load resistor 24, the load motor 25 provides load force for the test motor 3, the rotor of the load motor 25 is connected to a one-way bearing 27, and the coupling 26 is connected to the rotor of the load motor 25.

[0029] The present invention adopts the load supply mechanism of the motor load performance detection device to provide a corresponding load for the load detection of the test motor 3, and detects the rotation direction of the rotor of the test motor 3; using the load performance detection mechanism to collect and detect the parameters of the load work of the test motor 3 means: According to the load force required by the test motor 3, the resistance value of the load resistor 24 connected to the load motor 25 is adjusted through the resistance adjusting sheet to adjust the load force required by the test motor 3; the test motor 3 is installed in the motor positioning hole through the motor positioning plate 23, and the rotor of the test motor 3 is connected to the coupling 26; The test motor 3 is powered on and drives the rotor of the load motor 25 to rotate. If the rotor of the load motor 25 is stuck and cannot rotate, the rotation directions of the one-way bearing 27 of the test motor 3 and the load motor 25 are different, and the rotor of the test motor 3 rotates in the opposite direction, and the test motor 3 is judged to be a defective product; If the rotor of the load motor 25 rotates normally, the reaction force received by the rotor of the load motor 25 when rotating and cutting the magnetic field will serve as the load force provided to the test motor 3. At this time, a load performance detection mechanism is used to collect and detect the load working parameters of the test motor 3 to realize the load performance detection of the test motor 3.

[0030] The load performance detection mechanism of this embodiment adopts the existing technology, which is a load performance detection mechanism currently used for motors on the market.

[0031] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for detecting a brushless DC motor, characterized in that: A rotor assembly detection device, a motor load performance detection device and a motor noise detection device are provided; the motor load performance detection device includes a load supply mechanism and a load performance detection mechanism; the motor noise detection device includes a motor noise detection mechanism and a motor drive mechanism with a foolproof structure; The detection method comprises: using a rotor assembly detection device to detect the height between the rotor shaft end face of the test motor and the bottom of the end cover, and detecting the distance between the rotor shaft end face of the test motor and the retaining spring assembled on the rotor shaft, so as to prevent the motor from flowing out due to the mixing of rotors of different sizes, the use of wrong rotor sizes or incorrect rotor assembly; The load supply mechanism of the motor load performance detection device is used to provide the corresponding load for the test motor load detection, and to detect the rotation direction of the test motor rotor; the load performance detection mechanism is used to collect and detect the parameters of the test motor load operation; The motor drive mechanism of the motor noise detection device provides power drive for the noise detection of the test motor, and adopts a foolproof structure to prevent the test motor from being plugged in and out while it is powered on; A motor noise detection mechanism is used to perform noise detection on a test motor driven by a motor drive mechanism.

2. The detection method of a brushless DC motor according to claim 1, characterized in that: The motor drive mechanism also includes a power supply with a switch, a motor drive board, a time relay and a motor connection terminal; the power supply with a switch is connected to the motor drive board and the time relay respectively, the motor drive board is connected to the motor connection terminal, and the time relay is connected to the fool-proof structure; the fool-proof structure can shield the connection point between the motor connection terminal and the connector of the test motor.

3. The detection method of a brushless DC motor according to claim 2, characterized in that: The fool-proof structure includes an electromagnetic valve, a cylinder and a baffle; the electromagnetic valve is connected to a time relay and to the cylinder; the driving end of the cylinder is connected to the baffle, and when the cylinder drives the baffle to extend, the baffle can cover the connection between the motor connection terminal and the connector of the test motor.

4. The detection method of a brushless DC motor according to claim 3, characterized in that: The motor drive mechanism also includes a light bulb, which is connected to the motor drive board and serves as a discharge resistor of the motor drive board.

5. The detection method of a brushless DC motor according to claim 4, characterized in that: The motor drive mechanism of the motor noise detection device provides power drive for the noise detection of the test motor, and adopts a foolproof structure to prevent the test motor from being plugged in and out while it is powered on; Using a motor noise detection mechanism to detect the noise of a test motor driven by a motor drive mechanism means: The test motor is plugged into the motor connection terminal through the connector, the switch is turned on, the power supply energizes the motor drive board, the motor drive board drives the test motor to operate through the motor connection terminal, and the power supply also energizes the solenoid valve through the time relay. At this time, the solenoid valve is energized to control the cylinder to extend, so that the baffle is located above the plug-in point of the motor connection terminal and the connector of the test motor, so as to block the connector of the test motor to prevent the motor from being plugged in and out while it is powered on; A motor noise detection mechanism is used to detect the noise of the running test motor; When the test motor noise detection is completed, turn off the switch and the motor drive board is powered off. At this time, the voltage in the motor drive board is discharged through the light bulb; at the same time, the time relay receives the power-off signal from the power supply and sets the power-off delay. When the set power-off delay time is reached, the solenoid valve is controlled to cut off the power and the cylinder is controlled to retract to reset the baffle. At this time, the light bulb goes out and the connector of the test motor can be unplugged.

6. The detection method of a brushless DC motor according to claim 4, characterized in that: The power-off delay time of the time relay is equal to the discharge time of the motor drive board.

7. The detection method of a brushless DC motor according to claim 1, characterized in that: The rotor assembly detection device includes a base plate, a guide column, a shaft end limit plate and a retaining spring limit plate; the guide column is arranged on the base plate, the shaft end limit plate and the retaining spring limit plate are respectively adjustably connected to the guide column, the shaft end limit plate is located above the retaining spring limit plate, and the retaining spring limit plate is provided with a detection groove; the base plate is provided with a guide groove for facilitating the passage of the test motor, and the guide groove is provided with a clearance for the protrusion of the bottom of the end cover to pass through.

8. The detection method of a brushless DC motor according to claim 7, characterized in that: The use of the rotor assembly detection device to detect the height between the rotor shaft end face of the test motor and the bottom of the end cover, and the detection of the spacing between the rotor shaft end face of the test motor and the retaining spring assembled on the rotor shaft, refers to: adjusting the height of the shaft end limit plate according to the height between the rotor shaft end face of the test motor and the bottom of the end cover, and adjusting the height of the retaining spring limit plate according to the spacing between the rotor shaft end face of the test motor and the retaining spring assembled on the rotor shaft; Push the test motor through the guide groove into the bottom plate. If the rotor shaft end face of the test motor can pass through the shaft end limit plate, and the retaining ring of the test motor can pass through the detection groove of the retaining ring limit plate, then the test motor rotor is judged to be assembled qualified; otherwise, the test motor is judged to be an unqualified product.

9. The detection method of a brushless DC motor according to claim 1, characterized in that: The load supply mechanism includes a supporting bottom plate, a supporting top plate, a motor positioning plate, a load resistor with adjustable resistance, a load motor and a coupling; the supporting top plate is connected to the supporting bottom plate and is provided with a motor positioning hole, and the motor positioning plate is arranged on the supporting top plate and is located at the motor positioning hole; the load motor and the load resistor with adjustable resistance are respectively arranged on the supporting bottom plate; the UVW three-phase terminals of the stator of the load motor are respectively connected to the resistance adjusting sheet of the load resistor, and the load motor provides load force for the test motor; the rotor of the load motor is connected with a one-way bearing, and the coupling is connected to the rotor of the load motor.

10. The detection method of a brushless DC motor according to claim 9, characterized in that: The load supply mechanism of the motor load performance detection device provides a corresponding load for the test motor load detection and detects the rotation direction of the test motor rotor; the load performance detection mechanism is used to collect and detect the parameters of the test motor load work, which means: According to the load force required by the test motor, the resistance value of the load resistor connected to the load motor is adjusted through the resistance adjusting sheet to adjust the load force required by the test motor; the test motor is installed in the motor positioning hole through the motor positioning plate, and the rotor of the test motor is connected to the coupling; The test motor is powered on and runs, driving the rotor of the load motor to rotate. If the rotor of the load motor is stuck and cannot rotate, the rotation direction of the one-way bearings of the test motor and the load motor is different, and the rotor of the test motor rotates in the opposite direction, so the test motor is judged to be a failed product; If the rotor of the load motor rotates normally, the reaction force received by the rotor of the load motor when rotating and cutting the magnetic field will serve as the load force provided to the test motor. At this time, a load performance detection mechanism is used to collect and detect the load working parameters of the test motor to realize the load performance detection of the test motor.

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