Speed regulation of DC motor, regulating device and air conditioner

Abstract

The present invention provides a method, device and air conditioner for regulating the rotational speed of a DC motor. The method includes: S1: obtaining the starting time corresponding to the first time when the rotational speed difference between the current rotational speed and the target rotational speed of the DC motor is less than a first rotational speed preset value; S2: when the starting time is greater than a specified preset time, sending a voltage command for increasing the voltage change amount of the output voltage of the DC motor to increase or decrease the output voltage until the starting time is less than the specified preset time; S3: obtaining the number of times when the rotational speed difference is greater than the first rotational speed preset value within a specified time, and when the number of times is greater than a number threshold, sending a rotational speed command for increasing the first rotational speed preset value and returning to S1; S4: controlling and regulating the output voltage according to the comparison result between the rotational speed difference and the first rotational speed preset value and the voltage command; and / or regulating the output voltage by increasing the first rotational speed preset value according to the rotational speed command. The present invention can take into account both the rising speed of the rotational speed and the running stability, and is applicable to different installation environments.

Description

Technical Field

[0001] The present invention relates to the field of motor control, and specifically to a method and device for regulating the speed of a DC motor and an air conditioner. Background Art

[0002] With the continuous development of the household appliance industry, air-conditioning products equipped with in-drive DC motors have entered more and more families and usage scenarios with high noise requirements due to the quietness and comfort brought by their stepless speed regulation. Currently, stepless speed regulation DC motors on the market often use the given voltage as the control of the speed, and the main control MCU adjusts the given voltage according to the speed feedback.

[0003] Currently, there is usually only one speed regulation scheme on the market and it cannot be adjusted; when the speed regulation scheme is relatively comfortable, the speed increase is slow and cannot meet the user's needs; when the speed regulation scheme is relatively drastic, the speed is unstable, resulting in a poor user experience and also unable to meet the user's needs. In addition, since the loads of the motor are diverse, for different loads, the applicable control schemes are also different. Currently, the DC motor cannot adjust the output speed accordingly according to the installation environment where the air conditioner is located, and can only output according to the preset environment, resulting in the problem that its speed output does not match the environmental load. In addition, the in-drive DC motor can only feedback the speed and cannot feedback the current, and it is impossible to evaluate the matching degree of the environmental load and the system through the current. Summary of the Invention

[0004] In view of the above problems, the present invention provides a method and device for regulating the speed of a DC motor and an air conditioner, which can take into account both the speed increase rate of the DC motor and the stable operation of the DC motor, and enable the DC motor to adapt to different installation environments.

[0005] To solve the above problems, the present invention provides a method for regulating the speed of a DC motor, including the following steps:

[0006] S1: Obtain the starting time corresponding to the first time when the speed difference between the current speed and the target speed of the DC motor is less than the first speed preset value;

[0007] S2: When the starting time is greater than the specified preset time, issue a voltage command to increase or decrease the output voltage by increasing the voltage change amount of the output voltage of the DC motor until the starting time is less than the specified preset time, and the DC motor operates at a fixed speed preset value;

[0008] S3: Obtain the number of times when the speed difference of the DC motor within the specified time is greater than the first speed preset value. When the number is greater than the number threshold, issue a speed command to increase the first speed preset value, and return to step S1;

[0009] S4: Obtain the current speed of the DC motor at regular time intervals, and control and adjust the output voltage based on the comparison result between the speed difference and the first speed preset value in combination with the voltage command; and / or adjust the output voltage by increasing the first speed preset value according to the speed command.

[0010] The present invention adjusts the voltage change amount of the output voltage of the DC motor according to the comparison between the starting time of the DC motor and the specified preset time, thereby adjusting the rising or falling amplitude of the speed, solving the problem of too slow or too fast speed rise. By obtaining the speed difference at regular time intervals and combining the voltage command issued according to the comparison result between the starting time and the specified preset time, the output voltage can be dynamically adjusted. By detecting the relationship between the number of times the speed difference exceeds the first speed preset value and the number threshold to judge the running stability of the DC motor, the output voltage can be dynamically adjusted while ensuring the steady operation of the DC motor. By continuously adjusting the output voltage and judging whether the DC motor is running stably, the applicable range of the DC motor can be improved, so as to adapt to different installation environments. Further, increasing the first speed preset value expands the running range of the DC motor speed, prevents excessive adjustment, and further ensures the running stability of the DC motor. The present invention can adjust the motor speed without increasing additional costs, saving production costs.

[0011] In an alternative technical solution of the present invention, the step of controlling and adjusting the output voltage according to the comparison result between the speed difference and the first speed preset value and the voltage command includes:

[0012] When the target speed is greater than the current speed, control the output voltage to increase according to the voltage change amount; when the target speed is less than the current speed, control the output voltage to decrease according to the voltage change amount; when the target speed is equal to the current speed, maintain the output voltage unchanged.

[0013] In an alternative technical solution of the present invention, when the target speed is greater than the current speed and the speed difference is less than the first speed preset value, the output voltage increases by the first voltage variable; when the speed difference is less than the second speed preset value, the output voltage increases by the second voltage variable; when the speed difference is greater than the second speed preset value, the output voltage increases by the third voltage variable; the first speed preset value is less than the second speed preset value, and the first voltage variable, the second voltage variable, and the third voltage variable increase in sequence.

[0014] According to this technical solution, different speed difference ranges correspond to different voltage change amounts, so that the change amplitude of the output voltage can be adjusted according to different speed difference ranges, thereby reducing the voltage change amount, improving the accuracy of output voltage adjustment and the stability of system operation.

[0015] In an alternative technical solution of the present invention, the target speed is less than the current speed, the speed difference is less than the first speed preset value, and the output voltage decreases by the first voltage variable; when the speed difference is less than the second speed preset value, the output voltage decreases by the second voltage variable, and when the speed difference is greater than the second speed preset value, the output voltage decreases by the third voltage variable. The first speed preset value is less than the second speed preset value; the first voltage variable, the second voltage variable, and the third voltage variable increase in sequence.

[0016] According to this technical solution, different speed difference ranges correspond to different voltage change amounts, so that the change amplitude of the output voltage can be adjusted according to different speed difference ranges, thereby reducing the change amount of the output voltage, improving the accuracy of the output voltage adjustment and the stability of the system operation.

[0017] In an alternative technical solution of the present invention, it further includes step S5: when the number of times is less than the number threshold, control the DC motor to enter the trial operation mode, and the trial operation mode adjusts the operation of the DC motor by modifying the target speed.

[0018] According to this technical solution, the trial operation mode adjusts the operation of the DC motor by modifying the target speed, which can improve the matching degree between the target speed and the current speed, so as to adapt to different installation environments.

[0019] In an alternative technical solution of the present invention, the trial operation mode controls the modification of the target speed according to the comparison between the current ambient temperature and the specified temperature preset value.

[0020] According to this technical solution, the current ambient temperature reflects the cooling or heating effect of the air conditioner. By modifying the target speed according to the comparison result between the current ambient temperature and the specified temperature preset value, the operation of the DC motor runs around the target speed, so that the cooling or heating effect of the air conditioner is closer to the specified temperature preset value, thereby meeting the user's needs. The present invention provides a method for evaluating whether the environmental load matches the system by comparing the current ambient temperature with the temperature preset value, and solves the problem in the prior art that it is impossible to evaluate whether the environmental load matches the DC motor through the current.

[0021] In an alternative technical solution of the present invention, step S5 further includes sub-step S51: when the current ambient temperature is lower than the specified temperature preset value, judge the modification times of the target speed, and when the modification times are greater than 0, control the target speed to be permanently modified. By continuously modifying the target speed until the target speed meets the requirements, the matching degree between the system and the installation environment is improved.

[0022] In an alternative technical solution of the present invention, step S5 further includes sub-step S52: when the current ambient temperature is higher than the specified temperature preset value, determine whether the number of modifications to the target speed exceeds the specified number of modifications. When the specified number of modifications is not exceeded, control to increase the target speed and return to step S5; or when the specified number of modifications is exceeded, stop the operation of the DC motor.

[0023] According to this technical solution, when the operation of the DC motor does not meet the expectations, that is, when it does not match the installation environment, the operation of the DC motor is made to meet the expectations by continuously increasing the speed; when the number of modifications exceeds the specified number of modifications, that is, increasing the speed cannot make the operation of the DC motor meet the expectations, the operation of the DC motor is stopped.

[0024] The present invention further provides a speed regulation device for a DC motor, which executes the speed regulation method of the DC motor. The speed regulation device for the DC motor includes:

[0025] A first acquisition module, which acquires the starting time required for the speed difference between the current speed and the target speed of the DC motor to be less than the first speed preset value for the first time;

[0026] A second acquisition module, which acquires the current speed of the DC motor and the number of times the speed difference of the DC motor is greater than the first speed preset value within a specified time;

[0027] A first control module, which is used to issue a voltage command to increase or decrease the output voltage by increasing the voltage change amount of the output voltage of the DC motor when the starting time is greater than the specified preset time, until the starting time is less than the specified preset time;

[0028] A second control module, which is used to issue a speed command to increase the first speed preset value when the number of times is greater than the number threshold;

[0029] A third control module, which is communicatively connected to the first control module and the second control module. The third control module is used to control and adjust the output voltage according to the comparison result between the speed difference and the first speed preset value and the voltage command; and / or adjust the output voltage by increasing the first speed preset value according to the speed command.

[0030] The present invention further provides an air conditioner, which executes the above-mentioned speed regulation method of the DC motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flowchart of the speed regulation method of the DC motor in the first embodiment of the present invention.

[0032] Figure 2 It is a specific flowchart of the speed regulation method of the DC motor in the first embodiment of the present invention.

[0033] Figure 3It is a schematic flowchart for adjusting the output voltage in step S4 of the first embodiment of the present invention.

[0034] Figure 4 It is a schematic flowchart for the trial operation process in step S5 of the first embodiment of the present invention. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0036]

The first embodiment

[0037] Please refer to Figure 1 、 Figure 2 As shown, the present invention provides a method for adjusting the rotational speed of a DC motor, including the following steps:

[0038] S1: Obtain the starting time corresponding to the first time when the rotational speed difference between the current rotational speed and the target rotational speed of the DC motor is less than the first rotational speed preset value;

[0039] S2: When the starting time is greater than the specified preset time, issue a voltage command to increase or decrease the output voltage by increasing the voltage change amount of the output voltage of the DC motor until the starting time is less than the specified preset time, and the DC motor runs at a fixed rotational speed preset value;

[0040] S3: Obtain the number of times when the rotational speed difference of the DC motor is greater than the first rotational speed preset value within a specified time. When the number of times is greater than the number threshold, issue a rotational speed command to increase the first rotational speed preset value, and return to step S1;

[0041] S4: Obtain the current rotational speed of the DC motor at intervals of a specified time, and control the adjustment of the output voltage according to the comparison result between the rotational speed difference and the first rotational speed preset value in combination with the voltage command; and / or adjust the output voltage by increasing the first rotational speed preset value according to the rotational speed command.

[0042] The present invention adjusts the voltage change amount of the output voltage of a DC motor according to the comparison between the startup time of the DC motor and a specified preset time, and then adjusts the rising or falling amplitude of the rotational speed, so as to solve the problem of too slow or too fast rising of the rotational speed. By obtaining the rotational speed difference at specified time intervals and combining the voltage command issued according to the comparison result between the startup time and the specified preset time, the output voltage can be dynamically adjusted. By detecting the relationship between the number of times the rotational speed difference exceeds the first rotational speed preset value and the number threshold, the operating stability of the DC motor can be judged. While dynamically adjusting the output voltage, the steady-state operation of the DC motor can be ensured. By continuously adjusting the output voltage and judging whether the DC motor operates stably, the applicable range of the DC motor can be increased, so as to adapt to different installation environments. Further, by increasing the voltage change amount, the acceleration of the DC motor can be increased, so that the rising or falling speed of the rotational speed of the DC motor is accelerated, and the response time of the DC motor is shortened to meet the needs of users. Increasing the first rotational speed preset value expands the operating range of the rotational speed of the DC motor, prevents over-regulation, and further ensures the operating stability of the DC motor.

[0043] It should be noted that according to the rotational speed adjustment method shown in steps S1, S2, and S3 of the present invention, the first rotational speed preset value and the adjustment direction of the voltage change amount can be obtained, so that the rotational speed of the motor can be adjusted according to the first rotational speed preset value and the voltage change amount. It is applicable to the rotational speed adjustment of various motor types, not limited to DC motors; for DC motors, the rotational speed of the DC motor can be adjusted by adjusting the output voltage.

[0044] In a preferred embodiment of the present invention, as Figure 3 shown, the steps of controlling and adjusting the output voltage according to the comparison result between the rotational speed difference and the first rotational speed preset value and the voltage command include:

[0045] When the target rotational speed is greater than the current rotational speed, control the output voltage to increase the output voltage according to the voltage change amount; when the target rotational speed is less than the current rotational speed, control the output voltage to decrease the output voltage according to the voltage change amount; when the target rotational speed is equal to the current rotational speed, maintain the output voltage unchanged.

[0046] By the above method, when the target rotational speed is greater than the current rotational speed, control to increase the output voltage of the DC motor and further increase the output voltage; when the target rotational speed is less than the current rotational speed, control to decrease the output voltage of the DC motor, and the output voltage can be further decreased.

[0047] Specifically, in order to improve the accuracy of output voltage adjustment and the operating stability of the system, for different rotational speed difference ranges, the voltage change amount of the output voltage is different.

[0048] Such as Figure 3As shown, when the target speed is greater than the current speed and the speed difference is different, the values of the voltage change amounts (the first voltage variable, the second voltage variable, and the third voltage variable) are different. Further, when the speed difference is less than the first speed preset value, the output voltage of the DC motor increases by the first voltage variable; when the speed difference is less than the second speed preset value, the output voltage of the DC motor increases by the second voltage variable; when the speed difference is greater than the second speed preset value and the first speed preset value is less than the second speed preset value, the output voltage of the DC motor increases by the third voltage variable, and the first voltage variable, the second voltage variable, and the third voltage variable increase in sequence.

[0049] When the target speed is less than the current speed and the speed difference is different, the values of the voltage change amounts (the first voltage variable, the second voltage variable, and the third voltage variable) are different. Further, when the speed difference is less than the first speed preset value, the output voltage of the DC motor decreases by the first voltage variable; when the speed difference is less than the second speed preset value, the output voltage of the DC motor decreases by the second voltage variable; when the speed difference is greater than the second speed preset value, the output voltage of the DC motor decreases by the third voltage variable, and the first speed preset value is less than the second speed preset value, and the first voltage variable, the second voltage variable, and the third voltage variable increase in sequence. In a specific embodiment of the present invention, the values of the first specified voltage variable and the second specified voltage variable may be the same or different, and the present invention does not limit the values of the first specified voltage variable and the second specified voltage variable.

[0050] In the above manner, different speed difference ranges correspond to different voltage change amounts, so that the change amplitude of the output voltage can be adjusted according to different speed difference ranges, thereby reducing the change amount of the output voltage and improving the accuracy of the output voltage adjustment and the stability of the system operation.

[0051] In a preferred embodiment of the present invention, as Figure 2 shown, when the startup time is greater than the specified preset time, the third voltage variable is increased. Specifically, when the target speed is less than the current speed and the speed difference is greater than the second speed preset value, the rising amplitude of the output voltage of the DC motor is greater, further increasing the output voltage and the current speed. When the target speed is greater than the current speed and the speed difference is greater than the second speed preset value, the falling amplitude of the output voltage is greater, further reducing the output voltage and the current speed. The present invention does not limit the increase amount of the third voltage variable, and those skilled in the art can debug and operate the DC motor according to the actual situation and adjust the increase amount of the third voltage variable.

[0052] In a preferred embodiment of the present invention, when the number of times that the difference between the current speed and the target speed of the DC motor within a specified time is greater than a second specified preset value is greater than the number threshold, the output voltage of the DC motor is controlled and adjusted by increasing the first speed preset value and the second speed preset value, thereby adjusting the speed of the DC motor. The present invention does not limit the increase amounts of the first speed preset value and the second speed preset value. Those skilled in the art can debug and operate the DC motor according to the actual situation and adjust the increase amounts of the first speed preset value and the second speed preset value.

[0053] As Figure 2 , Figure 4 shown, in a preferred embodiment of the present invention, it further includes S5: when the number is less than the number threshold, control the DC motor to enter the trial operation mode, and the trial operation mode adjusts the operation of the DC motor by modifying the target speed. Adjusting the operation of the DC motor by modifying the target speed in the trial operation mode can improve the matching degree between the target speed and the current speed, thereby adapting to different installation environments.

[0054] In a preferred embodiment of the present invention, the trial operation mode controls and modifies the target speed according to the comparison between the current ambient temperature and the specified temperature preset value. The current ambient temperature reflects the cooling or heating effect of the air conditioner. By modifying the target speed according to the comparison result between the current ambient temperature and the specified temperature preset value, the operation of the DC motor runs around the target speed, so that the cooling or heating effect of the air conditioner is closer to the specified temperature preset value, thereby meeting the needs of users.

[0055] In a preferred embodiment of the present invention, step S5 further includes sub-step S51: when the current ambient temperature is lower than the specified temperature preset value, judge the number of times of modifying the target speed, and when the number of times of modification is greater than 0, control to permanently modify the target speed. By continuously modifying the target speed until the target speed meets the user's needs, the matching degree between the system and the installation environment is improved.

[0056] In a preferred embodiment of the present invention, step S5 further includes sub-step S52: when the current ambient temperature is higher than the specified temperature preset value, judge whether the number of times of modifying the target speed exceeds the specified number of modification times, and when it does not exceed the specified number of modification times, control to increase the target speed and return to step S5, or when it exceeds the specified number of modification times, stop operating the DC motor.

[0057] By the above method, when the operation of the DC motor does not meet the expectation, that is, it does not match the installation environment, the operation of the DC motor is made to meet the expectation by continuously increasing the speed; when the number of modification times exceeds the specified number of modification times, even if the speed is increased, the operation of the DC motor cannot meet the expectation, that is, stop operating the DC motor. In some embodiments, the technician will be informed after several consecutive failures to meet the expectation, and the target speed that does not meet the expectation will not be recorded.

[0058] In a preferred embodiment of the present invention, it further includes judging whether the DC motor matches the environmental load according to the comparison result between the current environmental temperature and the temperature threshold. When the current environmental temperature is lower than the temperature threshold, the environmental load does not match the DC motor system. Technicians can increase the target speed according to the actual situation. Further, in the trial operation mode, the current environmental temperature can be detected and compared with the temperature threshold to judge whether the DC motor matches the environmental load.

[0059] Corresponding to the first embodiment of the present invention, the present invention further provides a speed regulation device for a DC motor, which executes the above-mentioned speed regulation method for the DC motor. The speed regulation device for the DC motor includes:

[0060] A first acquisition module, which acquires the starting time required for the speed difference between the current speed and the target speed of the DC motor to be less than the first speed preset value for the first time;

[0061] A second acquisition module, which acquires the current speed of the DC motor and the number of times that the speed difference of the DC motor is greater than the first speed preset value within a specified time;

[0062] A first control module, which is communicatively connected to the first acquisition module, and is used for when the starting time is greater than the specified preset time, sending out a voltage command to increase or decrease the output voltage by increasing the voltage change amount of the output voltage of the DC motor until the starting time is less than the specified preset time;

[0063] A second control module, which is communicatively connected to the second acquisition module, and is used for when the number of times is greater than the number threshold, sending out a speed command to increase the first speed preset value;

[0064] A third control module, which is communicatively connected to the first control module and the second control module. The third control module is used for controlling and adjusting the output voltage according to the comparison result between the speed difference and the first speed preset value and the voltage command; and / or adjusting the output voltage by increasing the first speed preset value according to the speed command.

[0065] Although the above modules of the speed regulation device are shown in the embodiments of the present invention, the structural composition of the speed regulation device is not limited to the above modules. For example, it further includes a storage module, which is used for storing the above-mentioned starting time, specified temperature preset value, speed preset value, output voltage, voltage change amount, target speed, current speed, etc., so as to adjust the operation of the DC motor with reference to the above-mentioned values, so that the speed rising speed and operation stability of the DC motor meet the expectations.

[0066]

Second Embodiment

[0067] The second embodiment of the present invention provides an air conditioner, which executes the speed regulation method of the DC motor in the first embodiment or includes the above-mentioned speed regulation device for the DC motor.

[0068] In the above manner, it is possible to ensure that the speed of the DC motor of the air conditioner operates quickly and smoothly, meets the needs of users, and matches the installation environment.

[0069] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for regulating the speed of a DC motor, characterized in that, It includes the following steps: S1: Obtain the starting time corresponding to when the rotational speed difference between the current rotational speed and the target rotational speed of the DC motor is less than the first rotational speed preset value for the first time; S2: When the starting time is greater than the specified preset time, issue a voltage command to increase the voltage change amount of the output voltage of the DC motor to increase or decrease the output voltage until the starting time is less than the specified preset time; S3: Obtain the number of times that the rotational speed difference is greater than the first rotational speed preset value within the specified time. When the number is greater than the number threshold, issue a rotational speed command to increase the first rotational speed preset value, and return to step S1; S4: Control and adjust the output voltage according to the comparison result between the rotational speed difference and the first rotational speed preset value and the voltage command; and / or adjust the output voltage according to the rotational speed command, The step of controlling and adjusting the output voltage according to the comparison result between the rotational speed difference and the first rotational speed preset value and the voltage command includes: When the target rotational speed is greater than the current rotational speed, control the output voltage to increase the output voltage by the voltage change amount; when the target rotational speed is less than the current rotational speed, control the output voltage to decrease the output voltage by the voltage change amount; when the target rotational speed is equal to the current rotational speed, maintain the output voltage unchanged, When the target rotational speed is greater than the current rotational speed and the rotational speed difference is less than the first rotational speed preset value, the output voltage increases by the first voltage variable; when the rotational speed difference is less than the second rotational speed preset value, the output voltage increases by the second voltage variable; when the rotational speed difference is greater than the second rotational speed preset value, the output voltage increases by the third voltage variable; the first rotational speed preset value is less than the second rotational speed preset value, and the first voltage variable, the second voltage variable, and the third voltage variable increase in sequence, When the target rotational speed is less than the current rotational speed and the rotational speed difference is less than the first rotational speed preset value, the output voltage decreases by the first voltage variable; when the rotational speed difference is less than the second rotational speed preset value, the output voltage decreases by the second voltage variable; when the rotational speed difference is greater than the second rotational speed preset value, the output voltage decreases by the third voltage variable, and the first rotational speed preset value is less than the second rotational speed preset value; the first voltage variable, the second voltage variable, and the third voltage variable increase in sequence.

2. The speed regulation method of the DC motor according to claim 1, characterized in that, It further includes step S5: When the number is less than the number threshold, control the DC motor to enter the trial operation mode, and the trial operation mode adjusts the operation of the DC motor by modifying the target rotational speed.

3. The speed regulation method of the DC motor according to claim 2, characterized in that The trial operation mode controls and modifies the target rotational speed according to the comparison between the current ambient temperature and the specified temperature preset value.

4. The speed regulation method of the DC motor according to claim 3, characterized in that Step S5 further includes sub-step S51: When the current ambient temperature is lower than the specified temperature preset value, judge the modification times of the target rotational speed, and when the modification times are greater than 0, control to permanently modify the target rotational speed.

5. The speed regulation method of the DC motor according to claim 4, characterized in that, Step S4 further includes sub-step S52: when the current ambient temperature is higher than the preset value of the specified temperature, determine whether the number of modifications to the target speed exceeds the specified number of modifications, and when it does not exceed the specified number of modifications, control to increase the target speed and return to step S5, or when it exceeds the specified number of modifications, stop operating the DC motor.

6. A speed regulation device for a DC motor, characterized in that, Implement the speed regulation method of the DC motor according to any one of claims 1 to 5, and the speed regulation device of the DC motor includes: A first acquisition module that acquires the startup time required for the speed difference between the current speed and the target speed of the DC motor to be less than the first speed preset value for the first time; A second acquisition module that acquires the current speed of the DC motor and the number of times the speed difference is greater than the first speed preset value within a specified time; A first control module that, when the startup time is greater than the specified preset time, issues a voltage command to increase the voltage change amount of the output voltage of the DC motor to increase or decrease the output voltage until the startup time is less than the specified preset time; A second control module that, when the number of times is greater than the number threshold, issues a speed command to increase the first speed preset value; A third control module that is communicatively connected to the first control module and the second control module, and the third control module is used to control and adjust the output voltage according to the comparison result between the speed difference and the first speed preset value and the voltage command; and / or increase the first speed preset value according to the speed command to adjust the output voltage.

7. An air conditioner, characterized in that, Implement the speed regulation method of the DC motor according to any one of claims 1 to 5.

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