Motor steering detection device and single-motor bath heater

Abstract

The utility model relates to the technical field of motors, in particular to a motor steering detection device and a single-motor bath heater, a motor comprises a first winding, a second winding and a starting capacitor which are in ring connection, the first winding is connected with the starting capacitor and provided with a first node, and the second winding is connected with the starting capacitor and provided with a second node. The first winding and the second winding are connected and are provided with a third node, the third node is connected with a zero line of the mains supply, and the first node and the second node are respectively and controllably connected with a live line of the mains supply, the detection device comprises a first detection module, a second detection module and a processing module, and the first detection module is connected with the live line or the zero line to detect a first signal of the mains supply; the second detection module is connected with the first node to detect a second signal of the first winding and the starting capacitor, and the processing module determines the rotation direction of the motor according to the first signal and the second signal, so that the forward and reverse rotation states of the motor are accurately detected under the condition of low cost, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor detection, in particular to a motor steering detection device and a single-motor bathroom heater. Background Art

[0002] A single-motor bathroom heater blows air and ventilates by controlling the forward and reverse rotation of the motor, so the direction information of the motor is an important parameter for accurately obtaining the operating status of the motor.

[0003] In the related technology, current transformers are generally used to detect the current information of the motor, but the cost of current transformers is very high, which directly increases the selling price of the bathroom heater and thus reduces the user experience. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a motor rotation detection device that can accurately detect the forward and reverse rotation state of the motor under low-cost conditions to improve user experience.

[0005] The second purpose of the utility model is to provide a single-motor bathroom heater.

[0006] To achieve the above-mentioned purpose, the first embodiment of the utility model proposes a motor steering detection device, wherein the motor includes a first winding, a second winding and a starting capacitor, one end of the first winding is connected to one end of the starting capacitor and has a first node, one end of the second winding is connected to the other end of the starting capacitor and has a second node, the other end of the first winding is connected to the other end of the second winding and has a third node, the third node is connected to the neutral line of the power supply of the motor, and the first node and the second node are both connected to the live line of the power supply of the motor through a switching device, and the detection device includes: a first detection module, the first detection module is connected to the live line or the neutral line of the power supply and the first detection module includes a first optical coupler, the first detection module is used to detect a first signal of the power supply through the first optical coupler; a second detection module, the second detection module is connected to the first node and the second detection module includes a second optical coupler, the second detection module is used to detect a second signal of the first winding and the starting capacitor from the first node through the second optical coupler; a processing module, the processing module is connected to the first detection module and the second detection module respectively, and is used to determine the steering direction of the motor according to the first signal and the second signal.

[0007] In the motor steering detection device of the utility model, the motor includes a first winding, a second winding and a starting capacitor, the first winding, the second winding and the starting capacitor are connected in series and connected end to end, the connection point between the first winding and the starting capacitor is a first node, the connection point between the second winding and the starting capacitor is a second node, the connection point between the first winding and the second winding is a third node, the third node is connected to the neutral line of the mains, the first node and the second node are both connected to the live line of the mains through a switching device, the detection device includes a first detection module, a second detection module and a processing module, the first detection module is connected to the live line of the mains, and detects a first signal of the power supply through a first optical coupler in the first detection module, the second detection module is connected to the first node, so as to detect a second signal of the first winding and the starting capacitor through a second optical coupler in the second detection module, the processing module is respectively connected to the first detection module and the second detection module, and determines the steering direction of the motor according to the first signal and the second signal, so as to accurately detect the forward and reverse state of the motor under low-cost conditions and improve user experience.

[0008] In some examples, the first detection module also includes: a first voltage divider module, the first voltage divider module includes at least one voltage divider resistor, the input end of the first optical coupler is connected to both ends of a voltage divider resistor in the first voltage divider module; a first filter module, the input end of the first filter module is connected to the output end of the first optical coupler, and the output end of the first filter module is connected to the processing module.

[0009] In some examples, the first voltage-dividing module includes a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor and a fourth voltage-dividing resistor connected in series, and one end of the fourth voltage-dividing resistor is grounded, and both ends of the fourth voltage-dividing resistor are connected to the input end of the first optical coupler; the first filtering module includes a first filtering resistor, a second filtering resistor and a first filtering capacitor, the first filtering capacitor and the second filtering resistor are connected in parallel to form a first branch, both ends of the first branch are connected to the output end of the first optical coupler, and one end of the first branch serves as the output end of the first filtering module and is connected to a preset power supply through the first filtering resistor, and the other end of the first branch is grounded.

[0010] In some examples, the second detection module also includes: a second voltage divider module, the second voltage divider module includes at least one voltage divider resistor, the input end of the second optical coupler is connected to both ends of a voltage divider resistor in the second voltage divider module; a second filter module, the input end of the second filter module is connected to the output end of the second optical coupler, and the output end of the second filter module is connected to the processing module.

[0011] In some examples, the second voltage-dividing module includes a fifth voltage-dividing resistor, a sixth voltage-dividing resistor, a seventh voltage-dividing resistor, and an eighth voltage-dividing resistor connected in series, and one end of the eighth voltage-dividing resistor is grounded, and both ends of the eighth voltage-dividing resistor are connected to the input end of the second optical coupler; the second filtering module includes a third filtering resistor, a fourth filtering resistor, and a second filtering capacitor, the second filtering capacitor and the fourth filtering resistor are connected in parallel to form a second branch, both ends of the second branch are connected to the output end of the second optical coupler, and one end of the second branch serves as the output end of the second filtering module and is connected to a preset power supply through the third filtering resistor, and the other end of the second branch is grounded.

[0012] In some examples, the voltage of the preset power supply is 5 volts.

[0013] In some examples, the direction of the motor is determined based on the first signal and the second signal, including: when the period of the first signal is the same as the period of the second signal corresponding to the first winding, or the period of the first signal leads the period of the second signal corresponding to the second winding by a preset time length, then the motor is determined to be in a forward rotation state; when the period of the first signal leads the period of the second signal corresponding to the first winding by a preset time length, or the period of the first signal is the same as the period of the second signal corresponding to the second winding, then the motor is determined to be in a reverse state.

[0014] In some examples, the switching device includes a first switch and a second switch, the first switch is connected between a live line of the power supply and a first node, and the second switch is connected between the live line of the power supply and a second node.

[0015] In some examples, the startup capacitor has a capacitance of 1 microfarad and a withstand voltage of 250 volts.

[0016] In order to achieve the above-mentioned purpose, the second embodiment of the present utility model proposes a single-motor bathroom heater, which includes the motor direction detection device described in the above embodiment.

[0017] The single-motor bathroom heater of the embodiment of the utility model can accurately detect the forward and reverse rotation state of the single motor under low-cost conditions through the motor steering detection device in the above embodiment, thereby improving user experience.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the connection of motor windings in one embodiment of the utility model;

[0020] Figure 2This is a connection diagram of a motor steering detection device in one embodiment of the utility model;

[0021] Figure 3 is a waveform diagram of a first signal and a second signal in a specific embodiment of the utility model;

[0022] Figure 4 is a waveform diagram of a first signal and a second signal in another specific embodiment of the utility model;

[0023] Figure 5 is a waveform diagram of a first signal and a second signal in another specific embodiment of the utility model;

[0024] Figure 6 is a waveform diagram of a first signal and a second signal in another specific embodiment of the utility model;

[0025] Figure 7 It is a schematic diagram of the structure of a single-motor bathroom heater in an embodiment of the utility model. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] The motor steering detection device and the single-motor bathroom heater of the utility model embodiments are described below with reference to the accompanying drawings.

[0028] The utility model proposes a motor steering detection device, wherein, Figure 1 As shown, the motor includes a first winding S1, a second winding S2 and a starting capacitor CS, one end of the first winding S1 is connected to one end of the starting capacitor CS and has a first node, one end of the second winding S2 is connected to the other end of the starting capacitor CS and has a second node, the other end of the first winding S1 is connected to the other end of the second winding S2 and has a third node, the third node is connected to the neutral line of the power supply of the motor, and the first node and the second node are both connected to the live line of the power supply of the motor through a switch device. In some examples, the capacitance of the starting capacitor CS is 1 microfarad and the withstand voltage is 250 volts.

[0029] Specifically, the third node in this embodiment is connected to the neutral line of the power supply, and the first node and the second node are connected to the live line of the power supply through their respective switch devices. The power supply in this embodiment can be AC ​​power, wherein the first node can be connected to the live line of the AC power through the first switch K1, and the second node can be connected to the live line of the AC power through the second switch K2. The motor in this embodiment can be a unidirectional asynchronous motor used in a bathroom heater. The unidirectional asynchronous motor can blow warm air into the bathroom when rotating forward, and can exhaust the bathroom air and introduce fresh air when rotating reversely. The starting capacitor CS can improve the current and power factor of the unidirectional asynchronous motor when starting, so as to achieve the normal operation of the unidirectional asynchronous motor. For example, when the first switch K1 is closed, the first winding S1 can be used as a running winding, and the second winding S2 can be used as a starting winding. The starting winding and the starting capacitor CS are connected in series. Since the charging and discharging of the starting capacitor CS will cause the current cycle of the starting winding to lag behind the running winding by a quarter of a cycle, a rotating magnetic field is generated to drive the motor forward; when the second switch K2 is closed, the second winding S2 can be used as a running winding, and the first winding S1 can be used as a starting winding. The starting winding and the starting capacitor CS are connected in series. Since the charging and discharging of the starting capacitor CS will cause the current cycle of the starting winding to lag behind the running winding by a quarter of a cycle, a rotating magnetic field is generated to drive the motor to reverse.

[0030] In this embodiment, the motor steering detection device includes a first detection module 11, a second detection module 12 and a processing module 13, wherein the first detection module 11 is connected to the live wire of the power supply and the first detection module 11 includes a first photocoupler, and the first detection module 11 is used to detect a first signal of the power supply through the first photocoupler; the second detection module 12 is connected to the first node and the second detection module 12 includes a second photocoupler IC2, and the second detection module 12 is used to detect a second signal of the first winding S1 and the starting capacitor CS from the first node through the second photocoupler; the processing module 13 is respectively connected to the first detection module 11 and the second detection module 12, and is used to determine the steering direction of the motor according to the first signal and the second signal.

[0031] Specifically, see Figure 2As shown, the first detection module 11 includes a first optical coupler IC1, and the first detection module 11 is connected to the live wire and the processing module 13 respectively, and the second detection module 12 includes a second optical coupler IC2, and the second detection module 12 is connected to the first node and the processing module 13 respectively. The first detection module 11 can detect the first signal of the power supply, and the second detection module 12 can detect the second signal of the first winding S1 and the starting capacitor CS through the first node, and the second signal can be a voltage signal. Of course, in some examples, the second detection module 12 can also be connected to the second node to detect the second signal of the second winding S2 and the starting capacitor CS through the second node, and the processing module 13 can obtain the first signal through the first detection module 11 and the second signal through the second detection module 12, and then determine the direction of the motor according to the periodic relationship between the first signal and the second signal. It can be understood that in the two conditions of forward rotation and reverse rotation of the motor, the periodic relationship between the first signal and the second signal is different, and there may be three different situations of the same period, period lag and period advance.

[0032] It should be noted that, in some examples, the first detection module 11 can also be connected to the neutral line and the processing module 13 respectively. The first detection module 11 is used for zero-crossing detection. The signal obtained by the zero-crossing detection is the first signal. The first signal can determine the specific opening and closing conditions of the switch according to the periodic relationship between the second signals, and then determine the blowing and exhaust functions of the bathroom. Since the judgment principles of the two situations where the first detection module 11 is connected to the neutral line and the live line are similar, this embodiment is described in detail with the situation where the first detection module 11 is connected to the live line. In order to avoid redundancy, the other situation will not be repeated.

[0033] In some embodiments of the present invention, Figure 2 As shown, the first detection module 11 also includes a first voltage divider module and a first filtering module, wherein the first voltage divider module includes at least one voltage divider resistor, and the input end of the first optocoupler IC1 is connected to both ends of a voltage divider resistor in the first voltage divider module; the input end of the first filtering module is connected to the output end of the first optocoupler IC1, and the output end of the first filtering module is connected to the processing module 13.

[0034] Specifically, the first voltage-dividing module includes multiple voltage-dividing resistors, the output end of the first optocoupler IC1 includes two terminals, and the two terminals are respectively connected to the two ends of a voltage-dividing resistor in the first voltage-dividing module. The output end of the first optocoupler IC1 also includes two terminals, and the two terminals are respectively connected to the input end of the first filtering module, and the output end of the first filtering module is also connected to the processing module 13.

[0035] More specifically, the first optocoupler IC1 includes a light source emitter and a light source detector. The light source emitter may be a light emitting diode, and both ends of the light source emitter serve as input ends of the first optocoupler IC1. The light source detector may be a photoresistor, and both ends of the light source detector serve as output ends of the first optocoupler IC1.

[0036] In this embodiment, the first voltage-dividing module includes a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a third voltage-dividing resistor R3 and a fourth voltage-dividing resistor R4 connected in series, and one end of the fourth voltage-dividing resistor R4 is grounded, and both ends of the fourth voltage-dividing resistor R4 are connected to the input end of the first optical coupler IC1; the first filtering module includes a first filtering resistor R11, a second filtering resistor R12 and a first filtering capacitor C1, the first filtering capacitor C1 and the second filtering resistor R12 are connected in parallel to form a first branch, both ends of the first branch are connected to the output end of the first optical coupler IC1, and one end of the first branch serves as the output end of the first filtering module and is connected to a preset power supply through the first filtering resistor R11, and the other end of the first branch is grounded.

[0037] Specifically, Figure 2 As shown, the two ends of the fourth voltage-dividing resistor R4 are connected to the input end of the first optical coupler IC1. After the live wire is processed by the voltage-dividing module of the first voltage-dividing module, the input end of the first optical coupler IC1 can obtain the same voltage as the fourth voltage-dividing resistor R4, and then the light source emitter works and emits the light source. After the light source detector detects the light source emitted by the light source emitter, it can adjust the resistance so that the output end of the first optical coupler IC1 outputs the corresponding first signal. The filter voltage-dividing circuit composed of the first filter resistor R11, the second filter resistor R12 and the first filter capacitor C1 in the first filter module can ensure the successful output of the first signal. It should be noted that the size of the first signal is also related to the size of the preset power supply. In this embodiment, the voltage size of the preset power supply can be 5 volts.

[0038] In some embodiments of the present invention, Figure 2 As shown, the second detection module 12 also includes a second voltage divider module and a second filtering module, wherein the second voltage divider module includes at least one voltage divider resistor, and the input end of the second optocoupler IC2 is connected to both ends of a voltage divider resistor in the second voltage divider module; the input end of the second filtering module is connected to the output end of the second optocoupler IC2, and the output end of the second filtering module is connected to the processing module 13.

[0039] Specifically, the second voltage-dividing module includes multiple voltage-dividing resistors, the output end of the second optocoupler IC2 includes two terminals, the two terminals are respectively connected to the two ends of a voltage-dividing resistor in the second voltage-dividing module, the output end of the second optocoupler IC2 also includes two terminals, the two terminals are respectively connected to the input end of the second filtering module, and the output end of the second filtering module is also connected to the processing module 13.

[0040] More specifically, the second optocoupler IC2 also includes a light source emitter and a light source detector. The light source emitter can be a light emitting diode, and the two ends of the light source emitter serve as input ends of the second optocoupler IC2. The light source detector can be a photoresistor, and the two ends of the light source detector serve as output ends of the second optocoupler IC2.

[0041] In this embodiment, the second voltage-dividing module includes a fifth voltage-dividing resistor R5, a sixth voltage-dividing resistor R6, a seventh voltage-dividing resistor R7 and an eighth voltage-dividing resistor R8 connected in series, and one end of the eighth voltage-dividing resistor R8 is grounded, and both ends of the eighth voltage-dividing resistor R8 are connected to the input end of the second optocoupler IC2; the second filtering module includes a third filtering resistor R13, a fourth filtering resistor R14 and a second filtering capacitor C2, the second filtering capacitor C2 and the fourth filtering resistor R14 are connected in parallel to form a second branch, both ends of the second branch are connected to the output end of the second optocoupler IC2, and one end of the second branch serves as the output end of the second filtering module and is connected to a preset power supply through the third filtering resistor R13, and the other end of the second branch is grounded.

[0042] Specifically, Figure 2 As shown, the two ends of the eighth voltage-dividing resistor R8 are connected to the input end of the second optical coupler IC2. After the first switch K1 or the second switch K2 is closed, the live wire can be processed by the second voltage-dividing module for voltage-dividing. Then the input end of the second optical coupler IC2 can obtain the same voltage as the eighth voltage-dividing resistor R8, and then the light source emitter works and emits a light source. After the light source detector detects the light source emitted by the light source emitter, it can adjust the resistance so that the output end of the second optical coupler IC2 outputs the corresponding second signal. The filter voltage-dividing circuit composed of the third filter resistor R13, the fourth filter resistor R14 and the second filter capacitor C2 in the second filter module can ensure the successful output of the second signal. It should be noted that the size of the second signal is also related to the size of the preset power supply. In this embodiment, the voltage size of the preset power supply can be 5 volts.

[0043] In some embodiments of the present invention, the direction of rotation of the motor is determined based on the first signal and the second signal, including: when the period of the first signal is the same as the period of the second signal corresponding to the first winding S1, or the period of the first signal leads the period of the second signal corresponding to the second winding S2 by a preset time length, it is determined that the motor is in a forward rotation state; when the period of the first signal leads the period of the second signal corresponding to the first winding S1 by a preset time length, or the period of the first signal is the same as the period of the second signal corresponding to the second winding S2, it is determined that the motor is in a reverse state.

[0044] Specifically, in this embodiment, the first winding S1 corresponds to the winding for controlling the motor to blow air to the bathroom, and the second winding S2 corresponds to the winding for controlling the motor to ventilate the bathroom. Generally, the motor can blow air to the bathroom when it rotates forward, and can ventilate the bathroom when it rotates reversely. If the second signal is a signal corresponding to the first winding S1 detected by the second detection module 12, then when the period of the first signal is the same as the period of the second signal, such as Figure 3 As shown, it means that the first switch K1 is closed and the second switch K2 is turned off, and the two ends of the first winding S1 are connected to the neutral line and the live line respectively. Then, when the second detection module 12 detects the first winding S1 and the second signal obtained by the first detection module 11 detecting the live line is similar, that is, when the period of the first signal and the period of the second signal are the same, it can be determined that the motor is in the forward rotation state; when the period of the first signal leads the period of the second signal by a preset time length, such as Figure 4 As shown in the figure, curve 1 represents the first signal, and curve 2 represents the second signal, which means that the second switch K2 is closed and the first switch K1 is turned off, and the first winding S1 is connected in series with the starting capacitor CS. Since the charging and discharging of the starting capacitor CS will cause the second signal cycle to lag behind the first signal by a preset time length, it can be determined that the motor is also in a reverse state.

[0045] If the second signal is a signal corresponding to the second detection module 12 detecting the second winding S2, then when the period of the first signal is the same as the period of the second signal, Figure 3 As shown, it means that the current second closed first switch K1 is turned off, and the two ends of the second winding S2 are connected to the neutral line and the live line respectively. Then, the second signal obtained by the second detection module 12 detecting the second winding S2 is similar to the first signal obtained by the first detection module 11 detecting the live line, that is, when the period of the first signal is the same as the period of the second signal, it can be determined that the motor is in the reverse state; when the period of the first signal leads the period of the second signal by a preset time length, such as Figure 4As shown in the figure, curve 1 represents the first signal, and curve 2 represents the second signal, which means that the first switch K1 is closed and the second switch K2 is turned off, and the second winding S2 is connected in series with the starting capacitor CS. Since the charging and discharging of the starting capacitor CS will cause the second signal cycle to lag behind the first signal by a preset time length, it can be determined that the motor is also in the forward rotation state.

[0046] In another specific embodiment, when the first detection module 11 is connected to the neutral line, the second signal is still the signal detected by the second detection module 12 corresponding to the first winding S1. Then, when the period of the first signal differs from the period of the second signal by half a period, Figure 5 As shown, it means that the first switch K1 is closed and the second switch K2 is turned off, and the two ends of the first winding S1 are connected to the neutral line and the live line respectively. Then the second detection module 12 detects the first winding S1 to obtain a second signal that is obtained by detecting the live line, while the first detection module 11 detects the first signal that is obtained by detecting the neutral line. The two signals are opposite, and the periods are exactly half a period apart, that is, when the period of the first signal and the period of the second signal differ by half a period, it can be determined that the motor is in the forward rotation state; when the period of the first signal leads the period of the second signal by a preset time length, as Figure 6 As shown in the figure, curve 1 represents the first signal, and curve 2 represents the second signal, which means that the second switch K2 is closed and the first switch K1 is turned off, and the first winding S1 is connected in series with the starting capacitor CS. Since the charging and discharging of the starting capacitor CS will cause the second signal cycle to lag behind the first signal by a preset time length, it can be determined that the motor is also in a reverse state.

[0047] If the second signal is a signal corresponding to the second detection module 12 detecting the second winding S2, then when the period of the first signal differs from the period of the second signal by half a period, Figure 5 As shown, it means that the current second closed first switch K1 is turned off, and the two ends of the second winding S2 are connected to the neutral line and the live line respectively. Then the second detection module 12 detects the second winding S2 to obtain a second signal that is obtained by detecting the live line, and the first detection module 11 detects the first signal obtained by detecting the neutral line. The two signals are opposite, and the periods differ by half a period, that is, the period of the first signal differs from the period of the second signal by half a period. Then it can be determined that the motor is in a reverse state; when the period of the first signal leads the period of the second signal by a preset period, such as Figure 6 As shown in the figure, curve 1 represents the first signal, and curve 2 represents the second signal, which means that the first switch K1 is closed and the second switch K2 is turned off, and the second winding S2 is connected in series with the starting capacitor CS. Since the charging and discharging of the starting capacitor CS will cause the second signal cycle to lag behind the first signal by a preset time length, it can be determined that the motor is also in the forward rotation state.

[0048] It should be noted that, in this embodiment, the preset duration may be determined according to experimental data, and the processing module 13 in this embodiment may be a single chip microcomputer.

[0049] In summary, the motor rotation detection device of the present invention can accurately detect the forward and reverse rotation state of the motor at a low cost, thereby improving user experience.

[0050] Figure 7 It is a schematic diagram of the structure of a single-motor bathroom heater in an embodiment of the utility model.

[0051] Furthermore, if Figure 7 As shown, the utility model proposes a single-motor bathroom heater 100, which includes the motor steering detection device in the above embodiment.

[0052] The single-motor bathroom heater of the embodiment of the utility model can accurately detect the forward and reverse rotation state of the single motor under low-cost conditions through the motor steering detection device in the above embodiment, thereby improving user experience.

[0053] In addition, other structures and functions of the single-motor bathroom heater in the embodiment of the utility model are known to technicians in this field and will not be described here to reduce redundancy.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of the features. In the description of the present invention, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0057] In the present utility model, unless otherwise clearly specified or limited in the embodiments, the terms "install", "connect", "connect" and "fix" etc. appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific implementation situation.

[0058] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A motor steering detection device, characterized in that: The motor comprises a first winding, a second winding and a starting capacitor, one end of the first winding is connected to one end of the starting capacitor and has a first node, one end of the second winding is connected to the other end of the starting capacitor and has a second node, the other end of the first winding is connected to the other end of the second winding and has a third node, the third node is connected to the neutral line of the power supply of the motor, the first node and the second node are both connected to the live line of the power supply of the motor through a switch device, and the detection device comprises: a first detection module, the first detection module is connected to the live wire or the neutral wire of the power supply and the first detection module includes a first optical coupler, and the first detection module is used to detect a first signal of the power supply through the first optical coupler; a second detection module, the second detection module is connected to the first node and comprises a second optical coupler, and the second detection module is used to detect a second signal of the first winding and the starting capacitor from the first node through the second optical coupler; A processing module, wherein the processing module is connected to the first detection module and the second detection module respectively, and is used to determine the direction of rotation of the motor according to the first signal and the second signal.

2. The motor steering detection device according to claim 1, characterized in that: The first detection module also includes: A first voltage-dividing module, wherein the first voltage-dividing module comprises at least one voltage-dividing resistor, and an input end of the first optical coupler is connected to two ends of a voltage-dividing resistor in the first voltage-dividing module; A first filter module, wherein the input end of the first filter module is connected to the output end of the first optical coupler, and the output end of the first filter module is connected to the processing module.

3. The motor steering detection device according to claim 2, characterized in that: The first voltage-dividing module comprises a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor and a fourth voltage-dividing resistor connected in series, one end of the fourth voltage-dividing resistor is grounded, and both ends of the fourth voltage-dividing resistor are connected to the input end of the first optical coupler; The first filter module includes a first filter resistor, a second filter resistor and a first filter capacitor. The first filter capacitor and the second filter resistor are connected in parallel to form a first branch. Both ends of the first branch are connected to the output end of the first optical coupler, and one end of the first branch serves as the output end of the first filter module and is connected to a preset power supply through the first filter resistor. The other end of the first branch is grounded.

4. The motor steering detection device according to claim 1, characterized in that: The second detection module includes: A second voltage-dividing module, wherein the second voltage-dividing module comprises at least one voltage-dividing resistor, and an input end of the second optical coupler is connected to two ends of a voltage-dividing resistor in the second voltage-dividing module; A second filter module, wherein the input end of the second filter module is connected to the output end of the second optical coupler, and the output end of the second filter module is connected to the processing module.

5. The motor steering detection device according to claim 4, characterized in that: The second voltage-dividing module comprises a fifth voltage-dividing resistor, a sixth voltage-dividing resistor, a seventh voltage-dividing resistor and an eighth voltage-dividing resistor connected in series, one end of the eighth voltage-dividing resistor is grounded, and both ends of the eighth voltage-dividing resistor are connected to the input end of the second optical coupler; The second filter module includes a third filter resistor, a fourth filter resistor and a second filter capacitor. The second filter capacitor and the fourth filter resistor are connected in parallel to form a second branch. Both ends of the second branch are connected to the output end of the second optical coupler, and one end of the second branch serves as the output end of the second filter module and is connected to a preset power supply through the third filter resistor. The other end of the second branch is grounded.

6. The motor steering detection device according to claim 3 or 5, characterized in that: The voltage of the preset power supply is 5V.

7. The motor steering detection device according to any one of claims 1 to 5, characterized in that: Determining the direction of rotation of the motor according to the first signal and the second signal includes: When the period of the first signal is the same as the period of the second signal corresponding to the first winding, or the period of the first signal leads the period of the second signal corresponding to the second winding by a preset time length, it is determined that the motor is in a forward rotation state; When the period of the first signal leads the period of the second signal corresponding to the first winding by a preset time length, or the period of the first signal is the same as the period of the second signal corresponding to the second winding, it is determined that the motor is in a reverse state.

8. The motor steering detection device according to any one of claims 1 to 5, characterized in that: The switch device includes a first switch and a second switch, wherein the first switch is connected between the live line of the power supply and the first node, and the second switch is connected between the live line of the power supply and the second node.

9. The motor steering detection device according to any one of claims 1 to 5, characterized in that: The starting capacitor has a capacitance of 1 microfarad and a withstand voltage of 250 volts.

10. A single-motor bathroom heater, characterized in that: The invention comprises the motor steering detection device according to any one of claims 1 to 9.

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