Motor starting control method and device of oral irrigator, storage medium and program product

Abstract

The invention relates to a motor starting control method and device of an oral irrigator, a storage medium and a program product, a motor comprises a stator formed by a permanent magnet, a rotor formed by a coil winding, an electric brush, a positive terminal and a negative terminal, the positive terminal and the negative terminal are connected with two electrodes of a direct current power supply to form a closed loop, and an Mcu and a driving MOS are arranged on the closed loop. The Mcu controls and drives the MOS to output a PWM signal. The method comprises the following steps: giving an initial value a to the duty ratio of the PWM signal; an increment b is added to the duty ratio and lasts for a period of time t; and judging whether the duty ratio reaches a threshold value m, if so, maintaining the duty ratio output, and if not, returning to the previous step. The program product is stored on the storage medium and configured on the oral irrigator, so that the phenomenon of coil burning and smoking can be avoided by implementing the method, and the potential safety hazard of a fire hazard is eliminated.

Description

Technical Field

[0001] The present invention relates to a water flosser, and in particular to a motor start-up control method, device, storage medium and program product of the water flosser. Background Art

[0002] The water flosser is a device that uses high-pressure water to flush the oral cavity, clean the teeth, interdental spaces and gums. Its power source is a DC permanent magnet brushless motor. Figure 1 This motor includes a stator 10 composed of two magnets arranged facing each other, a rotor 20 composed of a winding coil, a brush 40 and positive and negative terminals 30. The positive and negative terminals 30 are connected to a DC power supply to form a closed loop. With the support of the DC power supply, the motor provides an inexhaustible source of power for the water flosser.

[0003] However, when the existing motor is started, a constant rated voltage is directly given to start it. As the current passes through the winding coil, the rotor continuously accelerates its rotation under the action of the magnetic field of the stator magnet. However, the distribution of the magnetic field between the two permanent magnets arranged opposite to each other is uneven. When the rotor rotates to a weak area of ​​the magnetic field, the electromagnetic force decreases and the rotor is easily stuck. After being stuck, the coil generates excessive current under the action of the constant rated voltage, which is easy to burn the coil and smoke, causing a fire safety hazard.

[0004] The above are the shortcomings of the prior art. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to provide a program product, which is stored on a storage medium and configured on a water flosser, and can implement a motor starting control method, which can avoid the phenomenon of smoke from burning coils and eliminate fire safety hazards.

[0006] The technical solution of the present invention is: a motor start-up control method for a dental flosser, wherein the motor comprises a stator composed of a permanent magnet, a rotor composed of a coil winding, a brush and positive and negative terminals, wherein the positive and negative terminals are connected to two electrodes of a DC power supply to form a closed loop, wherein an MCU and a driving MOS are provided on the closed loop, wherein the MCU controls the driving MOS to output a PWM signal, and the method comprises a program for executing the following steps:

[0007] Assign an initial value a to the duty cycle of the PWM signal;

[0008] Increase the duty cycle by an increment b for a period of time t;

[0009] Determine whether the duty cycle reaches a threshold value m, if yes, maintain the duty cycle output, if no, return to the previous step.

[0010] The preferred parameter range is: 35% <a<39%,

[0011] 1.5% <b<2.5%,

[0012] 180ms <t<220ms,

[0013] 98.5% <m<99.5%。

[0014] The model of the MCU is FT61EC22A, and the model of the driving MOS is TDM2310.

[0015] Another technical solution of the present invention is: a water flosser, comprising a motor, the motor comprising a stator composed of permanent magnets, a rotor composed of coil windings, brushes and positive and negative terminals, the positive and negative terminals are connected to two electrodes of a DC power supply to form a closed loop, and its characteristic is: the closed loop is provided with an MCU and a driving MOS, the MCU controls the driving MOS to output a PWM signal, the MCU is provided with a memory, a processor and a program stored in the memory, and the processor executes the program to implement the steps of the method as described above.

[0016] Another technical solution of the present invention is: a computer-readable storage medium having a computer program / instruction stored thereon, which implements the steps of the above-mentioned method when the computer program / instruction is executed by a processor.

[0017] Another technical solution of the present invention is: a computer program product, comprising a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0018] The technical effect of the present invention is: the single-chip microcomputer controls the MOS drive DC brush motor to start through an algorithm, and adopts voltage PWM modulation and gradually increasing duty cycle. In the startup phase, the voltage and matching current are increased for the motor, and the transient voltage at both ends of the motor presents a slowly increasing trend, thereby avoiding excessive current in the coil. Even if the rotor is stuck in a weak position of the permanent magnet (stator) magnetic field, the coil will not be burned or smoke will not occur, thereby eliminating the fire safety hazard; the present invention controls the voltage and current startup through software, thereby improving the stability of the power supply of the water flosser system, prolonging the life of the motor, and making the products using the motor more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of a DC brushless permanent magnet motor for a dental flosser.

[0020] Figure 2 It is a block diagram of the motor operation of the present invention.

[0021] Figure 3 It is a flow chart of the present invention.

[0022] Figure 4This is a graph showing the relationship between the direct power supply voltage and time of the motor of the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] See also Figure 1 to Figure 3 The present invention is an improvement on the existing motor. The motor 30 includes a stator 10 composed of two magnets arranged opposite to each other, a rotor 20 composed of winding coils, a brush 40, and positive and negative terminals 31 and 32. The positive and negative terminals 31 and 32 are connected to a DC power supply 50 to form a closed loop.

[0025] An MCU (specific model is FT61EC22A) 60 and a driving MOS (specific model is TDM2310) 70 are designed on the closed loop formed by the DC power supply 50 and the motor 30. The driving MOS, the full name of which is MOSFET, is a voltage-controlled device. The voltage between its gate and source determines the conduction of the current between the drain and the source. In order to enable the MOSFET to be turned on and off normally, quickly and reliably, a suitable driving signal is required. Under the action of a certain driving signal, a certain conduction rate is obtained between the drain and the source, thereby obtaining a PWM signal with a certain duty cycle, which is equivalent to changing the transient voltage directly acting on both ends of the motor. In the DC motor speed regulation, PWM is widely used, and the average voltage at both ends of the motor is controlled by changing the duty cycle of the PWM signal, thereby changing the working speed of the motor. This speed regulation principle is mastered by ordinary technicians, but the idea of ​​the present invention is to apply the above principle to the start-up stage of the motor.

[0026] Watch out Figure 3 , is a flow chart of the present invention, which can be summarized into the following steps:

[0027] First, the duty cycle of the PWM signal of the microcontroller is modulated to 37%;

[0028] Secondly, the duty cycle is increased by 2% and lasts for 200ms;

[0029] Then, determine whether the duty cycle increases to above 99%. If so, maintain the duty cycle output; otherwise, return to the previous step to continue execution.

[0030] In the prior art, the DC motor speed increases from 0 to the set speed based on directly providing the rated voltage and current of the motor, that is, the time taken for the voltage to increase from 0 to the rated voltage is 0; while the present invention adopts voltage PWM modulation and increasing duty cycle to power the oral irrigator motor. In the startup phase, the motor is given incremental voltage and matching current. The transient voltage at both ends of the motor increases slowly, avoiding the generation of excessive current in the coil. Even if the rotor is stuck in a weak position of the permanent magnet (stator) magnetic field, the coil will not be burned or smoke will not occur, thereby eliminating the fire safety hazard; and improving the stability of the power supply of the oral irrigator system.

[0031] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

[0032] The source program of the present invention is excerpted as follows;

[0033]

[0034]

[0035]

[0036]

[0037]

Claims

1. A method for controlling the motor start of a dental flosser, wherein the motor comprises a stator composed of a permanent magnet, a rotor composed of a coil winding, a brush, and positive and negative terminals, wherein the positive and negative terminals are connected to two electrodes of a DC power supply to form a closed loop, wherein an MCU and a driving MOS are provided on the closed loop, wherein the MCU controls the driving MOS to output a PWM signal, wherein the method is characterized in that: The method comprises the following steps: Assign an initial value a to the duty cycle of the PWM signal; Increase the duty cycle by an increment b for a period of time t; Determine whether the duty cycle reaches a threshold value m, if yes, maintain the duty cycle output, if no, return to the previous step.

2. The motor start control method of the oral irrigator according to claim 1, characterized in that: The preferred parameter range is: 35% <a<39%, 1.5％<b<2.5％, 180ms <t<220ms, 98.5％<m<99.5％。 3. The motor start control method of the oral irrigator as claimed in claim 1, characterized in that: The model of the MCU is FT61EC22A, and the model of the driving MOS is TDM2310.

4. A tooth flosser, comprising a motor, the motor comprising a stator composed of a permanent magnet, a rotor composed of a coil winding, a brush, and positive and negative terminals, the positive and negative terminals being connected to two electrodes of a DC power supply to form a closed loop, wherein: The closed loop is provided with an MCU and a driving MOS, the MCU controls the driving MOS to output a PWM signal, the MCU is provided with a memory, a processor and a program stored in the memory, and is characterized in that: the processor executes the program to implement the steps of the method according to claim 1.

5. The oral rinser according to claim 4, characterized in that: The preferred parameter range is: 35% <a<39%, 1.5％<b<2.5％, 180ms <t<220ms, 98.5％<m<99.5％。 6. The oral rinser according to claim 4, characterized in that: The model of the MCU is FT61EC22A, and the model of the driving MOS is TDM2310.

7. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to claim 1 are implemented.

8. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to claim 1 are implemented.

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