New energy motor performance detection device and method

Abstract

The application belongs to the field of new energy vehicles, and relates to a new energy motor performance detection device and method, and the technical scheme comprises a fixing support, a detection rotor, a detection stator, a torque sensor, a temperature sensor and a leakage detection sensor. The fixing support is fixedly connected with the ground. The detection rotor is provided with shafts at both ends and a magnetic block at the middle part, is movably arranged on the fixing support, and has a tendency to rotate around the center line. The detection stator is arranged on the fixing support and has a tubular structure as a whole, and the detection rotor is arranged on the inner side of the detection stator. The torque sensor is fixed to one end of the shaft of the detection rotor. The temperature sensor is configured to obtain the temperature of the motor shell of the new energy vehicle. The leakage detection sensor is electrically connected with the motor shell, and is configured to detect the insulation of the motor.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of new energy vehicles and relates to a new energy motor performance detection device and method. BACKGROUND

[0002] With the use of new energy vehicles, the motors of the new energy vehicles have certain aging problems, that is, the performance of the motors of the new energy vehicles gradually decreases with use.

[0003] At present, a large number of devices for detecting motor performance exist, but the devices for detecting motor performance are generally used in laboratories and need to be detected after the motors are removed from new energy vehicles. In addition, there are many types of new energy vehicles on the market, and the motor structures are different, that is, when the motor performance is detected, the fixed support structure and the output shaft height of the motor need to be adaptively adjusted so that the motor output shaft and the load can be effectively matched.

[0004] It can be understood that it is not economical and reasonable to replace the motor and provide a fixed support for the motor when the motor performance of a running new energy vehicle is detected on the market, and how to efficiently and cost-effectively quickly obtain the performance of the motor is one of the problems that the market urgently needs to solve. SUMMARY

[0005] To overcome the defects in the above related technologies, on the one hand, the application provides a new energy motor performance detection device. The new energy motor performance detection device comprises a fixed support, a detection rotor, a detection stator, a torque sensor, a temperature sensor and a leakage detection sensor. The fixed support is fixedly connected with the ground. Both ends of the detection rotor are shafts, and the middle part of the detection rotor is a magnetic block. The detection rotor is movably arranged on the fixed support, and the detection rotor has a tendency to rotate around the center line thereof. The detection stator is arranged on the fixed support, and the detection stator is in a tubular structure as a whole. The detection rotor is arranged on the inner side of the detection stator. The torque sensor is fixed to one end of the shaft of the detection rotor. The temperature sensor is configured to obtain the temperature of the motor shell of the new energy vehicle. The leakage detection sensor is electrically connected with the motor shell, and the leakage detection sensor is configured to detect the insulation of the motor.

[0006] The detection stator comprises a stator support, a stator coil, a commutator and a Hall sensor. The stator support is in the form of a tubular structure with both ends open. A plurality of mounting grooves are arranged on the side wall of the stator support and evenly distributed along the circumference of the side wall of the stator support. At least one stator coil is arranged in each mounting groove. The plurality of stator coils are electrically connected with the commutator, and the commutator is configured to control the current direction in the stator coil. The Hall sensor is fixed on the stator support, and the Hall sensor is used to obtain the position of the detection rotor.

[0007] Preferably, the detection rotor comprises a plurality of permanent magnets, which are evenly arranged around the center line of the rotation axis of the detection rotor, and the plurality of permanent magnets are arranged alternately with N and S poles.

[0008] Preferably, the new energy motor performance detection device further comprises a controller, which is electrically connected with the torque sensor, the temperature sensor, the electric leakage detection sensor, the commutator and the Hall sensor.

[0009] Preferably, a Hall sensor is arranged on the inner side wall of the stator support, and the Hall sensor comprises a Hall magnetic sensor.

[0010] Preferably, the mounting groove is a pipe with both ends open, the inner side wall of the mounting groove is provided with two wire grooves, and the end of the mounting groove close to the inner side of the stator support is provided with an anti-falling ring.

[0011] The stator support further comprises a closed shell which is adapted to the structure of the end of the mounting groove close to the outer side of the stator support. The closed shell is buckled onto the wire groove, and the closed shell is provided with an extension piece for fixing the stator coil.

[0012] Preferably, the two wire grooves in each mounting groove are electrically connected with the commutator. The commutator comprises a first output end and a second output end. One of the two wire grooves in the mounting groove is electrically connected with the first output end, and the other wire groove in the mounting groove is electrically connected with the second output end.

[0013] Preferably, the commutator has at least two, the mounting grooves are divided into a plurality of mounting groups, each mounting group is electrically connected with a corresponding commutator, and the mounting grooves in the plurality of mounting groups are arranged alternately.

[0014] Preferably, the new energy motor performance detection device further comprises a control circuit, the control circuit comprising: a rectifier circuit, a voltage stabilizing circuit, a thyristor and a current limiting control circuit. The rectifier circuit is electrically connected with the commercial power. The voltage stabilizing circuit is electrically connected with the rectifier circuit. The anode of the thyristor is electrically connected with the positive output end of the voltage stabilizing circuit, and the cathode of the thyristor is electrically connected with the commutator. One end of the current limiting control circuit is electrically connected with the positive output end of the voltage stabilizing circuit, and the other end of the current limiting control circuit is electrically connected with the control electrode of the thyristor. The voltage regulating resistor is arranged between the positive output end of the voltage stabilizing circuit and the anode of the thyristor.

[0015] The current limiting control circuit comprises: a first bias resistor, a second bias resistor, a transistor and a current limiting resistor; one end of the first bias resistor and one end of the current limiting resistor are electrically connected with the positive output end of the voltage stabilizing circuit, the other end of the first bias resistor is connected with one end of the second bias resistor in series, the other end of the second bias resistor is electrically connected with the other end of the voltage regulating resistor, the other end of the current limiting resistor is electrically connected with the collector of the transistor, the base of the transistor is electrically connected with the connection point of the first bias resistor and the second bias resistor, and the emitter of the transistor is electrically connected with the control electrode of the thyristor.

[0016] In addition, the application further provides a new energy motor performance detection method, which is suitable for the new energy motor performance detection device. The new energy motor performance detection method comprises the following steps: lifting the new energy vehicle by using a lifting machine, and removing the tire of the new energy vehicle; fixing the new energy motor performance detection device on one side of the new energy vehicle, and fixedly connecting the detection rotor and the shaft head of the wheel shaft of the new energy vehicle; starting the new energy vehicle, so that the wheel shaft of the new energy vehicle drives the detection rotor to rotate; connecting the detection stator with the power supply, monitoring the rotation angle of the detection rotor, and controlling the current direction in the plurality of stator coils of the detection stator through the commutator, so that the detection stator forms a magnetic field which hinders the rotation of the detection rotor; collecting the external output torque of the wheel shaft of the new energy vehicle through the torque sensor, and collecting the motor temperature and the insulation of the new energy vehicle.

[0017] Preferably, the number of stator coils in the detection stator is adjusted to control the magnetic field strength of the detection stator which hinders the rotation of the detection rotor.

[0018] The application has the following advantages:

[0019] The application has the advantages of small structure, adjustable load resistance, and can effectively detect the maximum torque of the motor and the heating condition of the motor under high torque, and can quickly detect the performance of the motor of the new energy vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0021] Figure 1 is a structural diagram of the present application;

[0022] Figure 2 is a partial area sectional view of the present application;

[0023] Figure 3 is a structural diagram of the detection stator of the present application;

[0024] Figure 4 is a structural diagram of the detection stator of the present application;

[0025] Figure 5 is a circuit diagram of the present application. DETAILED DESCRIPTION

[0026] In order to make the above objectives, characteristics and advantages of the present application more apparent, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] The terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0029] As Figures 1 to 5The application provides a new energy motor performance detection device. The new energy motor performance detection device comprises a fixing support 1, a detection rotor 2, a detection stator 3, a torque sensor 4, a temperature sensor 5 and a leakage detection sensor 6. The fixing support 1 is fixedly connected with the ground. The detection rotor 2 is provided with rotating shafts at two ends and a magnetic block at a middle part. The detection rotor 2 is movably arranged on the fixing support 1 and has a tendency to rotate around a center line. The detection stator 3 is arranged on the fixing support 1 and has a tubular structure. The detection rotor 2 is arranged on the inner side of the detection stator 3. The torque sensor 4 is fixed to one end of the rotating shaft of the detection rotor 2. The temperature sensor 5 is configured to obtain the temperature of a motor shell of a new energy vehicle. The leakage detection sensor 6 is electrically connected with the motor shell and is configured to detect the insulation of the motor.

[0030] The detection stator 3 comprises a stator support 31, a stator coil 32, a commutator 33 and a Hall sensor. The stator support 31 has a tubular structure with open ends. A plurality of mounting grooves are arranged on the side wall of the stator support 31 and are evenly distributed in the circumferential direction of the side wall. At least one stator coil 32 is arranged in each mounting groove. The plurality of stator coils 32 are electrically connected with the commutator 33. The commutator 33 is configured to control the current direction in the stator coil 32. The Hall sensor is fixed to the stator support 31 and is used to obtain the position of the detection rotor 2.

[0031] The detection rotor 2 comprises a plurality of permanent magnets. The plurality of permanent magnets are evenly arranged around the center line of the rotating shaft of the detection rotor 2. The N poles and S poles of the plurality of permanent magnets are arranged alternately.

[0032] The new energy motor performance detection device further comprises a controller. The controller is electrically connected with the torque sensor 4, the temperature sensor 5, the leakage detection sensor 6, the commutator 33 and the Hall sensor.

[0033] The Hall sensor is arranged on the inner side wall of the stator support 31. The Hall sensor comprises a Hall magnetic sensor.

[0034] The mounting groove is a pipe with open ends. Two wire grooves 35 are arranged on the inner side wall of the mounting groove. A anti-falling ring is arranged on the end of the mounting groove close to the inner side of the stator support 31.

[0035] The stator support 31 further comprises a closed shell 34 which is adapted to the structure of the mounting groove near one end of the outer side of the stator support 31, the closed shell 34 is buckled to the wire groove 35, and the closed shell 34 is provided with an extension piece for fixing the stator coil 32.

[0036] The two wire grooves 35 in each mounting groove are electrically connected with the commutator 33, the commutator 33 comprises a first output end and a second output end, one of the two wire grooves 35 in the mounting groove is electrically connected with the first output end, and the other of the two wire grooves 35 in the mounting groove is electrically connected with the second output end.

[0037] The commutator 33 is at least two, the mounting groove is divided into a plurality of mounting groups, each mounting group is electrically connected with a corresponding commutator 33, and the mounting grooves in the plurality of mounting groups are arranged alternately.

[0038] The new energy motor performance detection device further comprises a control circuit, the control circuit comprises: a rectifier circuit 71, a voltage stabilizing circuit 72, a thyristor SCR and a current limiting control circuit. The rectifier circuit 71 is electrically connected with the commercial power. The voltage stabilizing circuit 72 is electrically connected with the rectifier circuit 71. The anode of the thyristor SCR is electrically connected with the positive output end of the voltage stabilizing circuit 72, and the cathode of the thyristor SCR is electrically connected with the commutator 33. One end of the current limiting control circuit is electrically connected with the positive output end of the voltage stabilizing circuit 72, and the other end of the current limiting control circuit is electrically connected with the control electrode of the thyristor SCR, and the voltage regulating resistor R4 is arranged between the positive output end of the voltage stabilizing circuit and the anode of the thyristor.

[0039] The current limiting control circuit comprises: a first bias resistor R1, a second bias resistor R2, a transistor VT and a current limiting resistor R3; one end of the first bias resistor R1 and one end of the current limiting resistor R3 are electrically connected with the positive output end of the voltage stabilizing circuit 72, the other end of the first bias resistor R1 and one end of the second bias resistor R2 are connected in series, the other end of the second bias resistor R2 is electrically connected with the other end of the voltage regulating resistor R4, the other end of the current limiting resistor R3 is electrically connected with the collector of the transistor VT, the base of the transistor VT is electrically connected with the connection point of the first bias resistor R1 and the second bias resistor R2, and the emitter of the transistor VT is electrically connected with the control electrode of the thyristor SCR.

[0040] The new energy motor performance detection device also comprises a shaft coupling, which is arranged between the detection rotor 2 and the shaft head of the new energy vehicle axle. It should be noted that, based on the fact that most current vehicles have a differential, the vehicle wheel opposite to the to-be-detected vehicle wheel should be clamped before the application of the present application, so as to ensure that the motor can drive the detection rotor 2, wherein the vehicle wheel opposite to the to-be-detected vehicle wheel refers to the vehicle wheel that is coaxial with the to-be-detected vehicle wheel and is located on the two sides of the vehicle.

[0041] The stator coil 32 comprises a plurality of silicon steel sheets and copper wires, the silicon steel sheet is a plate material with an outer shape suitable for the mounting groove, and the plurality of silicon steel sheets are externally wound with copper wires after being overlapped, and the copper wires are externally provided with insulating paint. The positions of the two ends of the copper wire are adapted to the two wire grooves 35, that is, when the stator coil 32 is placed in the mounting groove, the copper wire is in communication with the wire groove 35.

[0042] According to the need, a plurality of stator coils 32 can be placed in the wire groove 35, and the winding directions of the copper wires of the stator coils 32 in the same wire groove 35 are consistent.

[0043] The end of the mounting groove close to the outside of the stator support 31 can be provided with external threads, and the closing shell 34 can be a pipe fitting suitable for the mounting groove and provided with internal threads, and the closing shell 34 can be screwed to the mounting groove.

[0044] The closing shell 34 is provided with a screw rod, that is, a telescopic member, and the length of the screw rod in the mounting groove can be adjusted by screwing the screw rod, and the screw rod is used to press the plurality of stator coils 32 to the end of the mounting groove close to the inside of the stator support 31.

[0045] The commutator 33 can adopt IGBT, and the commutator 33 has at least two, each of which is electrically connected to half of the plurality of mounting grooves, and the mounting grooves electrically connected to the same commutator 33 form an installation group, and the plurality of mounting grooves in the two installation groups are arranged at intervals, so that the magnetic poles on the inside of the detection stator 3 can be sorted in the sequence of “N pole”, “S pole”, “N pole”, … “S pole”, “N pole”, “S pole”.

[0046] The detection rotor 2 can comprise permanent magnets, and the plurality of permanent magnets are fixed to form a cylindrical structure, and the magnetic poles on the outside of the detection rotor 2 are arranged at intervals, for example, in the sequence of “N pole”, “S pole”, “N pole”, … “S pole”, “N pole”, “S pole”.

[0047] By controlling the commutator 33, the detection stator 3 can form resistance to the detection rotor 2, and by controlling the number of coils of the stator coil 32, the resistance can be controlled.

[0048] In the present application, the detection stator 3 forms resistance to the detection rotor 2, and when the N-pole of the detection rotor 2 approaches the next magnetic pole of the detection stator 3, the next magnetic pole of the detection stator 3 changes to an N-pole, and similarly, when the S-pole of the detection rotor 2 approaches the next magnetic pole of the detection stator 3, the next magnetic pole of the detection stator 3 changes to an S-pole.

[0049] In the present application, a Hall magnetic sensor is arranged on the inner side of the stator support 31, and the rotational speed or rotational angle of the detection rotor 2 can be obtained through the Hall magnetic sensor, which facilitates control of the commutator 33.

[0050] In addition, in order to avoid the current in the stator coil 32 being too large to burn out when the detection rotor 2 tightly holds the detection stator 3, the present application further comprises a current limiting control circuit, and the working process of the current limiting control circuit is as follows:

[0051] The resistance values of the bias resistor, the first resistor and the second resistor of the current limiting control circuit are all greater than that of the voltage regulating resistor R4, that is, the current passing through the current limiting control circuit is much smaller than the current passing through the thyristor SCR. When the current passing through the thyristor SCR increases, the voltage drop of the voltage regulating resistor R4 increases, and the voltage at the connection point of the first bias resistor R1 and the second bias resistor R2 decreases accordingly, so that the transistor VT is cut off, and the thyristor SCR has no maintaining current and is cut off, which can avoid the situation that the current in the stator coil 32 is too large to burn out.

[0052] In use, the temperature sensor 5 and the leakage detection sensor 6 can be arranged on the motor housing, and the torque sensor 4 is arranged between the shaft coupling and the detection rotor 2. The present application can conveniently and quickly detect the torque output of the motor, as well as the heating and insulation performance under long-time and high-torque conditions, which facilitates accurate evaluation of the motor performance of the new energy vehicle running for a period of time. In the present application, the motor performance refers to the torque output of the motor, the aging degree of the motor (which is related to the heating and insulation of the motor), which can provide relatively accurate evaluation for subsequent new energy vehicle transactions.

[0053] On the other hand, the present application also provides a new energy motor performance detection method, which is suitable for the new energy motor performance detection device described above. The new energy motor performance detection method comprises:

[0054] S1, using a lifting machine to lift the new energy vehicle, and removing the tires of the new energy vehicle.

[0055] S2, fixing the new energy motor performance detection device to one side of the new energy vehicle, and fixedly connecting the detection rotor 2 and the shaft head of the wheel shaft of the new energy vehicle.

[0056] S3, start the new energy vehicle, make the wheel shaft of the new energy vehicle drive the detection rotor 2 to rotate.

[0057] S4, connect the detection stator 3 with the power supply, monitor the rotation angle of the detection rotor 2, and control the current direction in the plurality of stator coils 32 of the detection stator 3 through the commutator 33, so that the detection stator 3 forms a magnetic field which hinders the rotation of the detection rotor 2.

[0058] S5, collect the external output torque of the wheel shaft of the new energy vehicle through the torque sensor 4, and collect the motor temperature and insulation of the new energy vehicle.

[0059] In some embodiments, before step S5, the new energy motor performance detection method described in the application further includes step S41.

[0060] S41, adjust the number of stator coils 32 in the detection stator 3 to control the magnetic field strength of the detection stator 3 which hinders the rotation of the detection rotor 2.

[0061] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0062] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A new energy motor performance detection device, characterized in that, The utility model relates to a new energy motor performance detection device, including: A fixed support is fixedly connected with the ground; A detection rotor, both ends of which are rotating shafts, and the middle part of which is a magnetic block, is movably arranged on the fixed support, and the detection rotor has a tendency to rotate around the center line thereof; A detection stator is arranged on the fixed support, and the detection stator is in the form of a tubular structure as a whole, and the detection rotor is arranged on the inner side of the detection stator; A torque sensor is fixed to one end of the rotating shaft of the detection rotor; A temperature sensor is configured to obtain the temperature of the motor housing of the new energy vehicle; An electric leakage detection sensor is electrically connected with the motor housing, and the electric leakage detection sensor is configured to detect the insulation of the motor. The detection stator comprises: A stator support in the form of a tubular structure with open ends as a whole, a plurality of mounting grooves are arranged on the side wall of the stator support, and the plurality of mounting grooves are uniformly arranged in the circumferential direction of the side wall of the stator support; At least one stator coil is arranged in each mounting groove; A commutator is electrically connected with the plurality of stator coils, and the commutator is configured to control the direction of current in the stator coils; A Hall sensor is fixed to the stator support, and the Hall sensor is used to obtain the position of the detection rotor. The new energy motor performance detection device further comprises a control circuit, and the control circuit comprises: A rectifier circuit is electrically connected with the commercial power supply; A voltage stabilizing circuit is electrically connected with the rectifier circuit; The anode of a thyristor is electrically connected with the positive output end of the voltage stabilizing circuit, and the cathode of the thyristor is electrically connected with the commutator; One end of a current limiting control circuit is electrically connected with the positive output end of the voltage stabilizing circuit, and the other end of the current limiting control circuit is electrically connected with the control electrode of the thyristor; A voltage regulating resistor is arranged between the positive output end of the voltage stabilizing circuit and the anode of the thyristor. The current limiting control circuit comprises a first bias resistor, a second bias resistor, a transistor and a current limiting resistor; one end of the first bias resistor and one end of the current limiting resistor are electrically connected with the positive output end of the voltage stabilizing circuit; the other end of the first bias resistor is connected in series with one end of the second bias resistor; the other end of the second bias resistor is electrically connected with the other end of the voltage regulating resistor; the other end of the current limiting resistor is electrically connected with the collector of the transistor; the base of the transistor is electrically connected with the connection point of the first bias resistor and the second bias resistor; and the emitter of the transistor is electrically connected with the control electrode of the thyristor.

2. The new energy motor performance detection device according to claim 1, characterized in that, The detection rotor comprises a plurality of permanent magnets, which are uniformly arranged around the center line of the rotating shaft of the detection rotor, and the N and S poles of the plurality of permanent magnets are arranged alternately.

3. The new energy motor performance detection device according to claim 2, characterized in that, The new energy motor performance detection device further comprises a controller, which is electrically connected with the torque sensor, the temperature sensor, the electric leakage detection sensor, the commutator and the Hall sensor.

4. The new energy motor performance detection device according to claim 3, characterized in that, The inner side wall of the stator support is provided with a Hall sensor, and the Hall sensor comprises a Hall magnetic sensor.

5. The new energy motor performance detection device according to claim 4, characterized in that, The mounting groove is a pipe with open ends, and two wire grooves are arranged on the inner side wall of the mounting groove; and a anti-disengagement ring is arranged on the end of the mounting groove close to the inner side of the stator support; The stator support further comprises a closed shell which is adapted to the structure of the end of the mounting groove close to the outer side of the stator support, and the closed shell is buckled to the wire groove; and an extension piece is arranged on the closed shell and used for fixing the stator coil.

6. The new energy motor performance detection device according to claim 5, characterized in that, The two wire grooves in each mounting groove are electrically connected with the commutator, and the commutator comprises a first output end and a second output end; one of the two wire grooves in the mounting groove is electrically connected with the first output end, and the other of the two wire grooves in the mounting groove is electrically connected with the second output end.

7. The new energy motor performance detection device according to claim 6, characterized in that, The commutator is at least two, and the mounting grooves are divided into multiple mounting groups, each mounting group is electrically connected with a corresponding commutator, and the mounting grooves in the multiple mounting groups are arranged alternately.

8. A new energy motor performance detection method, suitable for the new energy motor performance detection device of any one of claims 1-7, characterized in that, The new energy motor performance detection method comprises: The lifting machine is used to lift the new energy vehicle, and the tire of the new energy vehicle is removed; The new energy motor performance detection device is fixed on one side of the new energy vehicle, and the detection rotor and the shaft head of the wheel shaft of the new energy vehicle are fixedly connected; The new energy vehicle is started, and the wheel shaft of the new energy vehicle drives the detection rotor to rotate; The detection stator is connected with the power supply, the rotation angle of the detection rotor is monitored, the current direction in the multiple stator coils of the detection stator is controlled through the commutator, and the detection stator forms a magnetic field which hinders the rotation of the detection rotor; The torque sensor is used to collect the external output torque of the wheel shaft of the new energy vehicle, and the motor temperature and the insulation of the new energy vehicle are collected.

9. The new energy motor performance detection method according to claim 8, characterized in that, The number of the stator coils in the detection stator is adjusted to control the magnetic field strength of the detection stator which hinders the rotation of the detection rotor.

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