CN220156219U - Locked rotor protection circuit of direct-current brushless motor of air fryer - Google Patents
Locked rotor protection circuit of direct-current brushless motor of air fryer Download PDFInfo
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- CN220156219U CN220156219U CN202321656964.2U CN202321656964U CN220156219U CN 220156219 U CN220156219 U CN 220156219U CN 202321656964 U CN202321656964 U CN 202321656964U CN 220156219 U CN220156219 U CN 220156219U
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Abstract
The utility model discloses a locked rotor protection circuit of an air fryer direct current brushless motor, which relates to the field of food processing, and comprises: the brushless DC motor comprises a power module, a brushless DC motor and a current fuse body, wherein the current fuse body is used for cutting off a current loop of the brushless DC motor when the brushless DC motor is locked; the positive pole of the direct current brushless motor is communicated with the power module, the negative pole of the direct current brushless motor is communicated with the current fuse link, and the current fuse link is communicated with the power moduleThe method comprises the steps of carrying out a first treatment on the surface of the Wherein the maximum output limiting current of the power supply module is A 1 The fusing current of the current fusing body is A 2 The working current of the direct current brushless motor is A 3 The method comprises the following steps: 2A 3 ≤A 1 ≤3A 2 . The technical problem that the motor is damaged due to the fact that the DC brushless motor is likely to be blocked is solved.
Description
Technical Field
The utility model relates to the field of food processing, in particular to a locked rotor protection circuit of an air fryer direct current brushless motor.
Background
Nowadays, with the improvement of life quality, demands of consumers on food processors are also increasing, and among them, demands on portability and the like of the entire machine of the food processor such as an air fryer are also increasing. However, the current air fryer on the market generally uses an alternating current shaded pole motor to rotate convection fan blades, the volume of the alternating current shaded pole motor is large, one machine head of the alternating current shaded pole motor occupies half of the volume of the air fryer, the whole machine is heavy, the volume utilization rate is low, and the increasing requirements of consumers on the portability of the food processor are difficult to meet.
At present, a direct current brushless motor is used for rotating a convection fan blade, but the direct current brushless motor possibly has the condition of motor stalling, the prior art has no better anti-stalling solution, and if the air fryer is stalled in use, the temperature rise of the motor exceeds standard, the magnetic force of a rotor magnet in the motor can be damaged, and the motor is damaged.
Therefore, how to solve the technical problem that the direct current brushless motor may cause the motor damage due to the occurrence of locked rotation is a urgent need.
Disclosure of Invention
The utility model provides a locked rotor protection circuit of a direct current brushless motor of an air fryer, which aims to solve the technical problem that in the prior art, the direct current brushless motor may be locked to cause motor damage.
According to one aspect of the present utility model, there is provided a stall protection circuit for an air fryer DC brushless motor, comprising: the brushless DC motor comprises a power module, a brushless DC motor and a current fuse body, wherein the current fuse body is used for cutting off a current loop of the brushless DC motor when the brushless DC motor is locked; the positive pole of the direct current brushless motor is communicated with the power module, the negative pole of the direct current brushless motor is communicated with the current fuse link, and the current fuse link is communicated with the power module; wherein the saidMaximum output limiting current of power supply module is A 1 The fusing current of the current fusing body is A 2 The working current of the direct current brushless motor is A 3 The method comprises the following steps: 2A 3 ≤A 1 ≤3A 2 。
Optionally, the motor control device further comprises a control module for controlling the rotating speed of the direct current brushless motor; the control module is respectively connected with the power module and the direct current brushless motor.
Optionally, the control module comprises a single chip microcomputer and a controllable switch, wherein the voltage input end of the single chip microcomputer is connected with the power supply module through a DC-DC converter, and the output end of the single chip microcomputer is connected with the negative electrode of the DC brushless motor through the controllable switch.
Optionally, the control module further includes a rotation speed signal output line, where the rotation speed signal output line is respectively connected with the brushless dc motor and the single-chip microcomputer, and can send the rotation speed signal of the brushless dc motor to the single-chip microcomputer.
Optionally, the control module is configured to control the brushless dc motor to stop working when the rotational speed of the brushless dc motor is less than or equal to a preset rotational speed.
Optionally, the maximum output limiting current of the power supply module is greater than or equal to 1.2A and less than or equal to 1.5A.
Optionally, the fusing current of the current fusing body is greater than or equal to 0.5A and less than or equal to 0.8A.
Optionally, the brushless direct current motor is started in a PWM soft start mode, wherein the duty ratio of PWM is less than or equal to 50% and greater than or equal to 40%.
Optionally, the power module comprises a power chip, and a chip selection pin of the power chip is connected with the limiting current adjusting module.
Optionally, the limiting current adjusting module includes a first adjusting resistor, a second adjusting resistor, and a third adjusting resistor connected in parallel.
The embodiment of the utility model provides a locked rotor protection circuit of a direct current brushless motor of an air fryer, wherein a current fuse link is respectively connected with a power supply module and the direct current brushless motorThe output ends of the brushless motors are connected; the maximum output limiting current of the power supply module is A 1 The fusing current of the current fusing body is A 2 The working current of the direct current brushless motor is A 3 The method comprises the following steps: 2A 3 ≤A 1 ≤3A 2 . The arrangement mode can ensure that when the circuit current is the working current of the direct current brushless motor, the current fuse link keeps a passage, so that the normal work of the direct current brushless motor is ensured, and meanwhile, under the large current generated when the direct current brushless motor is started, the current fuse link can still keep the passage and not be fused; when locked-rotor occurs, the circuit current is increased to the maximum output limiting current, the current is higher than the fusing current of the current fusing body, and the current fusing body can be fused in a short time, so that the circuit is broken, the direct-current brushless motor is protected from being damaged by high current, and the technical problem that the direct-current brushless motor is likely to be locked-rotor and then damaged is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a locked rotor protection circuit for a DC brushless motor of an air fryer in accordance with the present utility model;
FIG. 2 is a schematic diagram of a locked rotor protection circuit for a DC brushless motor of an air fryer in accordance with another embodiment of the present utility model.
Reference numerals
1, a power module;
2, a direct current brushless motor;
3, a current fuse link;
the control module, 41 singlechip, 42 controllable switch, 43 rotation speed signal output line;
a 5DC-DC converter.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the prior art, in order to meet the increasing demand of consumers on the portability of food processors, the use of a brushless DC motor to rotate a convection fan blade exists in the market at present, but the brushless DC motor may have the condition of motor stalling, and the prior art has no better anti-stalling solution, and if the stalling occurs in use, the temperature rise of the motor is out of standard, the magnetic force of a rotor magnet in the motor is damaged, and the motor is damaged.
Therefore, based on the technical problems, the utility model provides a locked rotor protection circuit of a direct current brushless motor of an air fryer, which can solve the technical problems that the direct current brushless motor in the prior art is likely to be locked to cause motor damage.
FIG. 1 is a locked rotor protection circuit for an air fryer DC brushless motor in accordance with an embodiment of the utility model; as shown in fig. 1, the locked rotor protection circuit includes: a power module 1, a brushless dc motor 2, and a current fuse 3 for cutting off a current loop of the brushless dc motor 2 when the brushless dc motor 2 is locked; the positive electrode of the brushless DC motor 2 is communicated with the power module 1, the negative electrode of the brushless DC motor 2 is communicated with the current fuse link 3, and the current fuse link 3 is communicated with the power module 1; wherein the maximum output limiting current of the power module 1 is A 1 The fusing current of the current fusing body 3 is A 2 The working current of the brushless DC motor 2 is A 3 The method comprises the following steps: 2A 3 ≤A 1 ≤3A 2 。
Specifically, the maximum output limiting current of the power supply module 1 is a 1 The fusing current of the current fusing body 3 is A 2 The working current of the brushless DC motor 2 is A 3 The method comprises the following steps: 2A 3 ≤A 1 ≤3A 2 . At this time, when the circuit current is the operation current A of the DC brushless motor 2 3 When the direct current brushless motor 2 works, the current fuse link 3 can keep a passage, so that the direct current brushless motor 2 works normally; in addition, when the brushless dc motor 2 is started, a large starting current is generated, and the current fuse 3 can remain in the path without fusing even when the brushless dc motor 2 is started and the large current is generated; and when the DC brushless motor 2 is locked, the circuit current is increased to the maximum output limiting current A 1 The current fusing body 3 can be fused in a short time to break a circuit, so that the direct current brushless motor 2 is protected from being damaged by large current, and the technical problem that the direct current brushless motor 2 is likely to be blocked and damaged is solved.
Alternatively, the maximum output limit current a of the power supply module 1 1 1.2A or more and 1.5A or less.
Optionally, the fusing current a of the current fuse 3 2 0.5A or more and 0.8A or less.
Illustratively, the maximum output limit current A of the power supply module 1 can be made 1 It should be noted that, when the output current of the power module does not exceed the maximum output limiting current, the power module can operate in a constant voltage source mode, and when the output current of the power module reaches 1.4A, the power module can maintain the 1.4A current to continuously operate, and the voltage of the power module can be reduced along with the increase of the output power. The fusing current A of the current fusing body 3 can be made 2 0.63A, the working current A of the DC brushless motor 2 3 0.6A, at which point 2A is satisfied 3 ≤A 1 ≤3A 2 . When the motor rotates, the motor works normally, and the DC brushless motor 2 works at a normal working current A 3 The current does not exceed the fusing current A of the current fusing body 3 2 . When the brushless DC motor 2 is locked, the brushless DC motor 2 works in the maximum output limiting current A of the power module 1 1 The current far exceeds the fusing current A of the current fusing body 3 2 When the maximum output limit current A of the power module 1 1 The current fuse link 3 is fused within 20s after passing through the current fuse link 3. Therefore, in the locked-rotor working state, the power supply of the brushless motor is cut off, and the motor is prevented from being excessively accurate in temperature rise and even damaged in ignition due to continuous heavy current operation.
Optionally, the motor also comprises a control module 4 for controlling the rotating speed of the direct current brushless motor 2; the control module 4 is connected with the power module 1 and the brushless DC motor 2 respectively.
Optionally, the control module 4 includes a single-chip microcomputer 41 and a controllable switch 42, a voltage input end of the single-chip microcomputer 41 is connected with the power module 1 through the DC-DC converter 5, and an output end of the single-chip microcomputer 41 is connected with a negative electrode of the DC brushless motor 2 through the controllable switch 42.
Specifically, the voltage input end of the single-chip microcomputer 41 is connected with the power module 1 through the DC-DC converter 5, and the DC-DC converter 5 can convert the mains voltage into 25V voltage for providing the normal operation of the DC brushless motor 2, and can convert the 25V voltage into 5V voltage to provide the 5V power for the normal operation of the control module 4. The controllable switch 42 is used for controlling the switch of the motor of the brushless DC motor 2 and performing PWM speed regulation on the brushless DC motor 2. In the embodiment shown in fig. 2, the controllable switch 42 is a MOS transistor.
Optionally, the control module 4 further includes a rotation speed signal output line 43, where the rotation speed signal output line 43 is connected to the brushless dc motor 2 and the single-chip microcomputer 41, respectively, and is capable of sending the rotation speed signal of the brushless dc motor 2 to the single-chip microcomputer 41.
Optionally, the control module 4 is configured to control the brushless dc motor 2 to stop working when the rotation speed of the brushless dc motor 2 is less than or equal to a preset rotation speed.
Specifically, the control module 4 further includes a rotation speed signal output line 43, where the rotation speed signal output line 43 can send the rotation speed signal of the dc brushless motor 2 to the single chip microcomputer 41, so that the single chip microcomputer 41 can determine the state of the dc brushless motor 2 according to the rotation speed of the dc brushless motor 2, and make a corresponding control action. For example, if the motor rotation speed is detected to be lower than the preset rotation speed, it is determined that the current motor has locked rotation or friction, and the brushless dc motor 2 is controlled to stop working. The preset rotation speed may be selected according to practical situations, which is not limited in the present utility model, and the preset rotation speed may be 1300r/min.
Optionally, the brushless dc motor 2 is started by adopting a PWM soft start mode, where the duty ratio of the PWM is less than or equal to 50% and greater than or equal to 40%.
The PWM start-up causes the start-up current of the dc brushless motor 2 to be a pulse current that gradually increases. Thereby reducing the root mean square of the starting current of the brushless dc motor 2. Therefore, the current fusing body 3 is effectively protected, and cannot be fused when the direct current brushless motor 2 is started. And if the brushless DC motor 2 is in a locked state in the initial starting stage, the protection current fuse link 3 can not be fused quickly, the reliability of the whole system is improved, and the maintenance cost is reduced.
Optionally, the power module 1 further includes a power chip, and a chip selection pin of the power chip is connected with a limiting current adjusting module.
Optionally, the limiting current adjusting module includes a first adjusting resistor, a second adjusting resistor, and a third adjusting resistor connected in parallel.
Specifically, for example, if the maximum output limiting current of the power module is set to 1.4A, the resistance values of the first adjusting resistor, the second adjusting resistor, and the third adjusting resistor may be 1R, and 0.75R, respectively.
Thus far, the technical solution of the present disclosure has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the protective scope of the present disclosure is not limited to only these specific embodiments. The technical solutions in the above embodiments may be split and combined by those skilled in the art without departing from the technical principles of the present disclosure, and equivalent modifications or substitutions may be made to related technical features, which all fall within the scope of the present disclosure.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.
Claims (10)
1. The utility model provides a locked rotor protection circuit of air fryer DC brushless motor which characterized in that includes: the brushless DC motor comprises a power module, a brushless DC motor and a current fuse body, wherein the current fuse body is used for cutting off a current loop of the brushless DC motor when the brushless DC motor is locked;
the positive pole of the direct current brushless motor is communicated with the power module, the negative pole of the direct current brushless motor is communicated with the current fuse link, and the current fuse link is communicated with the power module;
wherein the maximum output limiting current of the power supply module is A 1 The fusing current of the current fusing body is A 2 The working current of the direct current brushless motor is A 3 The method comprises the following steps: 2A 3 ≤A 1 ≤3A 2 。
2. The stall-protection circuit of claim 1, further comprising a control module for controlling the rotational speed of the dc brushless motor; the control module is respectively connected with the power module and the direct current brushless motor.
3. The locked rotor protection circuit of an air fryer direct current brushless motor according to claim 2, wherein the control module comprises a single chip microcomputer and a controllable switch, a voltage input end of the single chip microcomputer is connected with the power supply module through a DC-DC converter, and an output end of the single chip microcomputer is connected with a negative electrode of the direct current brushless motor through the controllable switch.
4. The locked rotor protection circuit of an air fryer direct current brushless motor according to claim 3, wherein the control module further comprises a rotational speed signal output line, wherein the rotational speed signal output line is respectively connected with the direct current brushless motor and the singlechip, and can send rotational speed signals of the direct current brushless motor to the singlechip.
5. The stall protection circuit of claim 4 wherein the control module is configured to control the brushless dc motor to stop operation when the brushless dc motor is at or below a predetermined rotational speed.
6. The locked rotor protection circuit for a brushless direct current motor of an air fryer of claim 1, wherein said maximum output limiting current of said power module is greater than or equal to 1.2A and less than or equal to 1.5A.
7. The locked rotor protection circuit of an air fryer direct current brushless motor according to claim 1, wherein the fusing current of the current fusing body is greater than or equal to 0.5A and less than or equal to 0.8A.
8. The locked rotor protection circuit for a brushless DC motor of an air fryer of claim 1, wherein said brushless DC motor is started by a PWM soft start mode, wherein a duty cycle of said PWM is 50% or less and 40% or more.
9. The locked rotor protection circuit for an air fryer DC brushless motor of claim 1, wherein the power supply module comprises a power chip, and wherein a limiting current adjustment module is connected to a chip select pin of the power chip.
10. The locked rotor protection circuit for an air fryer DC brushless motor according to claim 9, wherein the limiting current regulator module comprises a first regulator resistor, a second regulator resistor, and a third regulator resistor connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321656964.2U CN220156219U (en) | 2023-06-28 | 2023-06-28 | Locked rotor protection circuit of direct-current brushless motor of air fryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321656964.2U CN220156219U (en) | 2023-06-28 | 2023-06-28 | Locked rotor protection circuit of direct-current brushless motor of air fryer |
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| Publication Number | Publication Date |
|---|---|
| CN220156219U true CN220156219U (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321656964.2U Active CN220156219U (en) | 2023-06-28 | 2023-06-28 | Locked rotor protection circuit of direct-current brushless motor of air fryer |
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| Country | Link |
|---|---|
| CN (1) | CN220156219U (en) |
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2023
- 2023-06-28 CN CN202321656964.2U patent/CN220156219U/en active Active
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