A method for motor locked-rotor protection

Abstract

The application discloses a motor stall protection method, and relates to the technical field of consumer electronic products, and comprises the following specific steps: measuring a current diagram of a motor during operation, and drawing a current-rotational speed corresponding table; determining an expected effect of motor stall protection; setting a full-speed fixed operation time of the motor as 350 ms; after full-speed operation for 350 ms, stopping power supply of the motor to slow down the motor; after 100 ms, re-starting power supply of the motor, and detecting the current size of the motor based on a detection circuit; after stopping power supply, re-starting power supply of the motor after 100 ms; detecting whether the current is greater than 200 mA based on the detection circuit; and when the detected current is greater than 200 mA, stopping power supply of the motor. The motor stall protection method judges the rotational speed of the current motor based on the current size, and reduces the impact force by reducing the speed, so that the motor is protected from damage.

Description

Technical Field

[0001] This invention relates to the field of consumer electronics technology, specifically to a method for motor stall protection. Background Technology

[0002] Consumer electronics products are specific types of household appliances containing electronic components. They are typically used for entertainment, communication, and document processing, such as telephones, audio-visual educational materials, televisions, DVD players, and even electronic clocks. The electronic components in consumer electronics also include motors, which are electromagnetic devices that convert or transmit electrical energy based on the law of electromagnetic induction. They primarily utilize a energized coil to generate a rotating magnetic field, which acts on a rotor to create magnetoelectric torque.

[0003] In existing technology, a motor drives a shaft to rotate via a reduction gearbox. The shaft is only allowed to rotate a certain angle, limited by a limit point. When the shaft reaches its maximum angle, it stops rotating because it is stopped by the limit point. The motor is also forced to stop rotating, but it remains energized, causing an increase in current and generating significant heat. Prolonged exposure to this heat will damage the motor. Furthermore, when the maximum rotation angle is reached, the motor stops abruptly due to the limit point, and the resulting impact can damage the reduction gearbox.

[0004] To address the aforementioned issues, we propose a method for motor stall protection. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for protecting a motor from stall, thereby resolving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a motor stall protection method, which detects the motor current based on a detection circuit and provides stall protection for the motor based on the detected current. The motor stall protection method includes the following specific steps:

[0007] S1. Use the detection circuit to measure the current diagram of the motor during operation, and draw a table corresponding to the current and speed.

[0008] S2. Determine the desired effect of motor stall protection;

[0009] S3. Set the motor's full-speed fixed running time to 350ms;

[0010] S4. After running at full speed for 350ms, the power supply to the motor is stopped to slow down the motor.

[0011] S5. After 100ms, the power supply to the motor is restored, and the current of the motor is detected by the detection circuit to determine whether to stop the power supply to the motor.

[0012] S6. After the power supply is stopped, the power supply to the motor will be restored after 100ms.

[0013] S7. Based on the detection circuit, if the current is greater than 200mA, continue to supply power to the motor if it is less than 200mA;

[0014] S8. When the detected current is greater than 200mA, the motor rotates to the stall position, the power supply to the motor is stopped, and the whole process is completed.

[0015] To further optimize this technical solution, the detection circuit includes an ADC current detection module and a detection resistor. The detection resistor is connected in series with the motor, and the ADC current detection module is connected in parallel between the motor and the detection resistor.

[0016] To further optimize this technical solution, the detection circuit is used to measure the current flowing through the motor, the resistance value of the detection resistor is 1Ω, and the detection circuit measures the current diagram when the motor is running.

[0017] To further optimize this technical solution, the drawing of the current-speed correspondence table in step S1 includes the following process: using a detection circuit to measure the current diagram of the motor during operation, and combining it with the motor's specifications and the actual test results of the detection circuit, a current-speed correspondence table is obtained.

[0018] To further optimize this technical solution, the actual test is used to test the total time from the starting point to the stall impact position of the motor. The total time from the starting point to the stall impact position of the motor is 450ms, and the corresponding current is 200mA.

[0019] To further optimize this technical solution, in step S2, the desired effect is that when the motor rotates to the stall impact position, the motor collides at a speed of 50 r / min, and the corresponding current is 130mA, which is used to reduce damage to the gearbox.

[0020] To further optimize this technical solution, in step S3, the motor runs at full speed for 350ms to ensure that the motor has not reached the stall impact position and is at a distance from the stall impact position.

[0021] To further optimize this technical solution, in step S5, when the detection circuit detects that the current is lower than 130mA corresponding to 50r / min, that is, when the motor speed exceeds the set desired effect, the power supply to the motor is stopped again.

[0022] Compared with the prior art, the present invention provides a method for motor stall protection, which has the following beneficial effects:

[0023] This motor stall protection method uses a circuit to detect the motor current, determines the current speed of the motor based on the current, and reduces the impact force by slowing down the speed, thereby protecting the motor from damage. Attached Figure Description

[0024] Figure 1 This is a schematic flowchart of a motor stall protection method proposed in this invention;

[0025] Figure 2 This is a circuit diagram of the detection circuit in a motor stall protection method proposed in this invention;

[0026] Figure 3 This is a current diagram of the motor during operation in a motor stall protection method proposed in this invention. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example:

[0029] Please see Figure 1 A method for motor stall protection is proposed, which uses a detection circuit to detect the motor current and performs stall protection on the motor based on the detected current.

[0030] In this embodiment, as Figure 2 As shown, the detection circuit includes an ADC current detection module and a detection resistor. The detection resistor is connected in series with the motor, and the ADC current detection module is connected in parallel between the motor and the detection resistor. The detection circuit is used to measure the magnitude of the current flowing through the motor. The resistance value of the detection resistor is 1Ω, and the detection circuit obtains the current diagram of the motor during operation.

[0031] The motor stall protection method includes the following specific steps:

[0032] S1. Use the detection circuit to measure the current diagram of the motor during operation and draw a table corresponding to the current and speed.

[0033] In this embodiment, the drawing of the current-speed correspondence table in step S1 includes the following process: using a detection circuit to measure the current diagram of the motor during operation, the current diagram is as follows: Figure 3 As shown, based on the motor's specifications and the actual test results of the detection circuit, a current-speed correspondence table is obtained.

[0034] According to actual test results, the total time for the motor to rotate from the starting point to the stall impact position is 450ms.

[0035] Furthermore, the corresponding table for the current and rotational speed is shown in Table 1 below:

[0036] Current mA 60 70 80 90 100 110 120 130 Rotational speed (r / min) 250 200 150 100 80 70 60 50

[0037] S2. Determine the desired effect of motor stall protection.

[0038] In this embodiment, the desired effect in step S2 is that when the motor rotates to the stall impact position, the motor collides at a speed of 50 r / min, and the corresponding current is 130 mA, which is used to reduce damage to the gearbox.

[0039] S3. Set the motor to run at full speed for a fixed time of 350ms.

[0040] In this embodiment, in step S3, the motor runs at full speed for 350ms to ensure that the motor has not reached the stall impact position and is at a certain distance from the stall impact position.

[0041] S4. After running at full speed for 350ms, the power supply to the motor is stopped to slow down the motor.

[0042] S5. After 100ms, the power supply to the motor is restored, and the current of the motor is detected by the detection circuit to determine whether to stop the power supply to the motor.

[0043] Furthermore, in step S5, when the detection circuit detects that the current is lower than 130mA corresponding to 50r / min, that is, when the motor speed exceeds the set desired effect, the power supply to the motor is stopped again.

[0044] S6. After the power supply is stopped, the power supply to the motor will be restored after 100ms.

[0045] S7. The detection circuit detects whether the current is greater than 200mA. If it is less than 200mA, the power supply to the motor continues.

[0046] S8. When the detected current is greater than 200mA, the motor rotates to the stall position, the power supply to the motor is stopped, and the whole process is completed.

[0047] This method involves designing a circuit to detect the magnitude of the motor current, determining the current speed of the motor based on the current magnitude, and reducing the impact force by decreasing the speed, thereby protecting the motor from damage.

[0048] The beneficial effects of this invention are:

[0049] This motor stall protection method uses a circuit to detect the motor current, determines the current speed of the motor based on the current, and reduces the impact force by slowing down the speed, thereby protecting the motor from damage.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for protecting a motor from stall, characterized in that, The motor stall protection method involves detecting the motor current using a detection circuit and then applying the detected current to the motor for stall protection. The specific steps of this method are as follows: S1. Use the detection circuit to measure the current diagram of the motor during operation, and draw a table corresponding to the current and speed. The process of drawing the current-speed correspondence table includes the following steps: using a detection circuit to measure the current diagram of the motor during operation, and combining it with the motor's specifications and the actual test results of the detection circuit, the current-speed correspondence table is obtained. The actual test was used to test the total time it takes for the motor to rotate from the starting point to the stall impact position. The total time it takes for the motor to rotate from the starting point to the stall impact position is 450ms, and the corresponding current is 200mA. S2. Determine the desired effect of motor stall protection; S3. Set the motor's full-speed fixed running time to 350ms; S4. After running at full speed for 350ms, the power supply to the motor is stopped to slow down the motor. S5. After 100ms, the power supply to the motor is restored, and the current of the motor is detected by the detection circuit to determine whether to stop the power supply to the motor. S6. After the power supply is stopped, the power supply to the motor will be restored after 100ms. S7. Based on the detection circuit, if the current is greater than 200mA, continue to supply power to the motor if it is less than 200mA; S8. When the detected current is greater than 200mA, the motor rotates to the stall position, the power supply to the motor is stopped, and the whole process is completed.

2. The method for motor stall protection according to claim 1, characterized in that, The detection circuit includes an ADC current detection module and a detection resistor. The detection resistor is connected in series with the motor, and the ADC current detection module is connected in parallel between the motor and the detection resistor.

3. The motor stall protection method according to claim 2, characterized in that, The detection circuit is used to measure the current flowing through the motor, the resistance value of the detection resistor is 1Ω, and the detection circuit measures the current diagram when the motor is running.

4. The motor stall protection method according to claim 1, characterized in that, In step S2, the desired effect is that when the motor rotates to the stall impact position, the motor collides at a speed of 50 r / min, and the corresponding current is 130 mA, which is used to reduce damage to the gearbox.

5. A method for protecting a motor from stall according to claim 1, characterized in that, In step S3, the motor runs at full speed for 350ms to ensure that the motor has not reached the stall impact position and is at a distance from the stall impact position.

6. The method for motor stall protection according to claim 1, characterized in that, In step S5, when the detection circuit detects that the current is lower than 130mA corresponding to 50r / min, that is, when the motor speed exceeds the set expected effect, the power supply to the motor is stopped again.

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