Cord strength training apparatus with resistance maintenance circuit

Abstract

The application discloses a rope strength training instrument power-off resistance maintaining circuit, and relates to the technical field of fitness equipment, which comprises a power converter and at least one electromagnetic switch, wherein: the input end of the power converter is connected with an input power module of the rope strength training instrument, and the output end of the power converter is connected with the two ends of the coil of the electromagnetic switch; the electromagnetic switch comprises at least one group of normally closed contacts, and the at least one group of normally closed contacts is connected between at least two of the first motor wire, the second motor wire and the third motor wire of a three-phase permanent magnet motor of the rope strength training instrument; the first motor wire is connected with any one of the U phase, the V phase and the W phase of input alternating current, and the second motor wire and the third motor wire are correspondingly connected with the remaining two phases of input alternating current; the application reduces the power-off resistance maintaining cost, installation volume, installation precision requirement, power consumption and heat generation of the rope strength training instrument, and improves the power-off resistance maintaining response speed.

Description

Technical Field

[0001] This application relates to the field of fitness equipment technology, and in particular to a resistance-maintaining circuit for a rope strength training device. Background Technology

[0002] A new type of rope strength training device, using a motor as a digitally controlled resistance source to drive the rope for resistance training, is rapidly developing. In existing rope strength training devices, the rope is taken in by a take-up mechanism inside the device. This take-up mechanism is directly or indirectly connected to the motor shaft, and the motor drives its rotation. The user connects a handle to one end of the rope inside the take-up mechanism and pulls the handle to perform resistance training. When the rope strength training device suddenly loses power, the motor rotor becomes free and without torque, providing no resistance. The take-up mechanism connected to the motor shaft also becomes free and without resistance. If the user is performing heavy weight and wide-range rope pulling movements under these conditions, they may fall due to the sudden loss of resistance.

[0003] To ensure that the motor rotor of a rope strength trainer can still provide some resistance in the event of a sudden power outage, existing designs install a mechanical electromagnetic friction plate resistance brake device on the motor shaft. However, mechanical electromagnetic friction plate resistance brake devices have disadvantages such as high cost, slow response speed, large size, high installation precision requirements, high power consumption, and high heat generation. Summary of the Invention

[0004] The purpose of this application is to provide a resistance-maintaining circuit for a rope strength training device, which can solve the problems of high cost, slow response speed, large installation size, high installation accuracy requirements, high power consumption and high heat generation associated with maintaining resistance in a rope strength training device by installing a mechanical electromagnetic friction plate resistance brake device on the motor shaft.

[0005] To achieve the above objectives, this application provides the following solution:

[0006] In a first aspect, this application provides a resistance-maintaining circuit for a rope strength training device, comprising a power converter and at least one electromagnetic switch, wherein:

[0007] The input terminal of the power converter is connected to the input power module of the rope strength training device, and the output terminal of the power converter is connected to both ends of the coil of the electromagnetic switch.

[0008] The electromagnetic switch includes at least one set of normally closed contacts. At least two of the first motor wire, second motor wire, and third motor wire of the three-phase permanent magnet motor of the rope strength training device are connected to at least one set of the normally closed contacts. The first motor wire is connected to any one of the U, V, and W phases of the input AC power, and the second and third motor wires are connected to the remaining two phases of the input AC power.

[0009] Optionally, the electromagnetic switch includes at least one of an electromagnetic relay and a contactor;

[0010] The normally closed contacts are provided in two sets, wherein:

[0011] The first set of normally closed contacts is connected between the first motor line and the second motor line, and the second set of normally closed contacts is connected between the third motor line and the second motor line or between the third motor line and the first motor line.

[0012] Optionally, the two sets of normally closed contacts are disposed within one electromagnetic switch.

[0013] Optionally, the two sets of normally closed contacts are respectively arranged in the two electromagnetic switches.

[0014] Optionally, the electromagnetic switch includes at least one of an electromagnetic relay and a contactor;

[0015] The normally closed contacts are provided in three sets, of which:

[0016] The first contacts of the three sets of normally closed contacts are connected together, and the second contacts of the three sets of normally closed contacts are connected one-to-one with the first motor line, the second motor line and the third motor line.

[0017] Optionally, the three sets of normally closed contacts are disposed within one electromagnetic switch.

[0018] Optionally, the three sets of normally closed contacts are respectively arranged in the three electromagnetic switches.

[0019] Optionally, the three sets of normally closed contacts are disposed in two electromagnetic switches, wherein the first electromagnetic switch is provided with two sets of normally closed contacts and the second electromagnetic switch is provided with one set of normally closed contacts.

[0020] Optionally, an induced voltage discharge diode is connected in parallel across the coil of each electromagnetic switch;

[0021] The two ends of the coil of the electromagnetic switch are connected to the first end of the first interface, and the second end of the first interface is used to connect to the power converter.

[0022] Each normally closed contact of the electromagnetic switch is connected to the first end of the second port, and the second end of the second port is used to connect to the first motor line, the second motor line, or the third motor line.

[0023] Optionally, the input power module includes a third interface and a power conversion circuit, wherein:

[0024] The first end of the third interface is connected to a DC voltage or a standard AC voltage.

[0025] If the first terminal of the third interface is connected to a DC voltage, the power conversion includes a filter circuit and a three-phase inverter circuit connected in sequence, wherein:

[0026] The input terminal of the filter circuit is connected to the second terminal of the third interface, and the output terminal of the three-phase inverter circuit is connected to the first motor line, the second motor line, and the third motor line respectively.

[0027] If the first terminal of the third interface is connected to a standard AC voltage, the power conversion circuit further includes a rectifier circuit, wherein:

[0028] The input terminal of the rectifier circuit is connected to the second terminal of the third interface, and the output terminal of the rectifier circuit is connected to the input terminal of the filter circuit.

[0029] The input terminal of the power converter or the second terminal of the first interface is connected to the second terminal of the third interface.

[0030] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0031] This application provides a resistance-maintaining circuit for a rope strength training device. Since the resistance-maintaining circuit includes at least one electromagnetic switch, and the electromagnetic switch includes at least one set of normally closed contacts, the resistance-maintaining circuit includes at least one set of normally closed contacts. By connecting the input power module of the rope strength training device to the electromagnetic switch via a power converter, the opening and closing of each set of normally closed contacts can be controlled by energizing and de-energizing the input power module of the rope strength training device. Furthermore, by connecting at least two of the first, second, and third motor lines of the three-phase permanent magnet motor of the rope strength training device to at least two of the first, second, and third motor lines, the opening and closing of the normally closed contacts can control the connection and disconnection of at least two of the first, second, and third motor lines of the three-phase permanent magnet motor.

[0032] When the rope strength trainer is running normally, the coil ends of the electromagnetic switch are energized, and each set of normally closed contacts connected between at least two of the first, second, and third motor lines of the three-phase permanent magnet motor is in the open state, so the three-phase permanent magnet motor of the rope strength trainer works normally.

[0033] If a power outage suddenly occurs during the operation of the rope strength trainer, the coil of the electromagnetic switch will be de-energized. At least two normally closed contacts connected to at least two of the first, second, and third motor wires of the three-phase permanent magnet motor will switch to a normally closed state. At least two of the first, second, and third motor wires will then be interconnected, creating an external short-circuit loop at least two of the connections in the three-phase stator windings of the three-phase permanent magnet motor. When an external force pulls the rope, the rope drives the take-up coil to rotate. The rotation of the permanent magnets on the rotor of the three-phase permanent magnet motor induces an electromotive force (EMF) in the three-phase stator windings. Since at least two of the connections in the three-phase stator windings form an external short-circuit loop, the induced EMF also has a current loop. This current synchronously generates an electromagnetic force, which in turn creates mutual electromagnetic resistance on the permanent magnets on the motor rotor, preventing the rotor of the three-phase permanent magnet motor from rotating. This generates a corresponding external pulling resistance on the external rope end, preventing a fall due to a sudden loss of resistance caused by a power outage.

[0034] Compared to existing technologies that use mechanical electromagnetic friction plate resistance brakes mounted on motor shafts, this application replaces expensive and bulky mechanical motor electromagnetic brakes with low-cost and small-volume electromagnetic switches. This reduces the cost, installation size, installation accuracy requirements, power consumption, and heat generation of rope strength training equipment while improving the response speed of resistance maintenance. It solves the problems of high cost, slow response speed, large installation size, high installation accuracy requirements, high power consumption, and high heat generation associated with using mechanical electromagnetic friction plate resistance brakes mounted on motor shafts for resistance maintenance in rope strength training equipment. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a resistance-maintaining circuit for a rope strength training device according to an embodiment of this application;

[0037] Figure 2A schematic diagram of the first circuit principle of a resistance-maintaining circuit for a rope strength training device provided in an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the second circuit principle of a resistance-maintaining circuit for a rope strength training device, provided as another embodiment of this application.

[0039] In the diagram, 1. Power converter, 2. Electromagnetic switch, 3. Input power module, 4. Three-phase permanent magnet motor, 5. Third interface, 6. Filter circuit, 7. Three-phase inverter circuit, 8. Rectifier circuit. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] In one exemplary embodiment, such as Figure 1 As shown, a resistance-maintaining circuit for a rope strength training device is provided, including a power converter 1 and at least one electromagnetic switch 2. The input terminal of the power converter 1 is connected to the input power module 3 of the rope strength training device, and the output terminal of the power converter 1 is connected to both ends of the coil of the electromagnetic switch 2.

[0043] The electromagnetic switch 2 includes at least one set of normally closed contacts. At least two of the first motor wire, the second motor wire, and the third motor wire of the three-phase permanent magnet motor 4 of the rope strength training device are connected to at least one set of normally closed contacts. The first motor wire is connected to any one of the U, V, and W phases of the input AC power, and the second and third motor wires are connected to the remaining two phases of the input AC power.

[0044] In this embodiment, if the first motor wire is connected to the U phase of the input AC power, the second motor wire can be connected to the V phase of the input AC power, and the third motor wire can be connected to the W phase of the input AC power. In this case, at least one set of normally closed contacts can be connected between the first and second motor wires, between the first and third motor wires, or between the second and third motor wires.

[0045] The specific structure of the power converter 1 is not limited and can be selected according to actual needs, as long as it can provide power to the coil of the electromagnetic switch 2. For example, a switching power supply can be used as the power converter 1. Another example is using a power frequency transformer as the power converter 1.

[0046] The connection method between the input terminal of power converter 1 and the input power module 3 of the rope strength training equipment, as well as the connection method between the output terminal of power converter 1 and the two ends of the coil of electromagnetic switch 2, are not specifically limited. They can be directly connected or indirectly connected, and can be set according to actual needs. For example, the output terminal of power converter 1 can be connected to the two ends of the coil of electromagnetic switch 2 through a voltage regulator.

[0047] Electromagnetic switch 2 is a mechanical electromagnetic switch, including at least one set of normally closed contacts. Electromagnetic switch 2 controls the operation of each set of normally closed contacts through the attraction force generated by the coil. If the coil of electromagnetic switch 2 is energized, the attraction force generated by the coil controls the opening of each set of normally closed contacts at the reed end. If the coil of electromagnetic switch 2 is de-energized, the coil does not generate an attraction force, and each set of normally closed contacts at the reed end resets and closes.

[0048] The electromagnetic switch 2 includes at least one of an electromagnetic relay and a contactor. If one electromagnetic switch 2 is used, the electromagnetic switch 2 uses either an electromagnetic relay or a contactor. If two or more electromagnetic switches 2 are used, both electromagnetic switches 2 can use either an electromagnetic relay or a contactor, or they can use both an electromagnetic relay and a contactor simultaneously.

[0049] The electromagnetic switch 2 can be connected as a separate device between the power converter 1 and the three-phase permanent magnet motor 4, with all three connected by wires, to function as an independent braking unit. Alternatively, the power converter 1 and the electromagnetic switch 2 can be integrated onto the controller circuit board of the three-phase permanent magnet motor 4.

[0050] Since the resistance-breaking pressure maintenance circuit of the rope strength training device of this application includes at least one electromagnetic switch 2, and the electromagnetic switch 2 includes at least one set of normally closed contacts, the resistance-breaking pressure maintenance circuit of the rope strength training device of this application includes at least one set of normally closed contacts. By connecting the input power module 3 of the rope strength training device to the electromagnetic switch 2 through the power converter 1, the opening and closing of each set of normally closed contacts can be controlled by the power-on and power-off of the input power module 3 of the rope strength training device. By connecting at least two of the first motor wire, second motor wire and third motor wire of the three-phase permanent magnet motor 4 of the rope strength training device with at least one set of normally closed contacts, the opening and closing of the normally closed contacts can control the opening and closing of at least two of the first motor wire, second motor wire and third motor wire of the three-phase permanent magnet motor 4.

[0051] When the rope strength trainer is running normally, the coil of electromagnetic switch 2 is energized, and each set of normally closed contacts connected between at least two of the first motor wire, second motor wire and third motor wire of the three-phase permanent magnet motor 4 is in the open state, and the three-phase permanent magnet motor 4 of the rope strength trainer is working normally.

[0052] If a power outage suddenly occurs during the operation of the rope strength trainer, the coil of electromagnetic switch 2 will be de-energized. At least two normally closed contacts connected to at least two of the first, second, and third motor wires of the three-phase permanent magnet motor 4 will switch to a normally closed state. At least two of the first, second, and third motor wires will then be interconnected, forming an external short-circuit loop in at least two connections of the three-phase stator windings of the three-phase permanent magnet motor 4. When an external force pulls the rope, the rope drives the take-up reel to rotate. The rotation of the permanent magnets on the rotor of the three-phase permanent magnet motor 4 induces an electromotive force (EMF) in the three-phase stator windings. Since at least two connections in the three-phase stator windings form an external short-circuit loop, the induced EMF has a current loop. The current synchronously generates an electromagnetic force, which in turn creates mutual electromagnetic resistance on the permanent magnets on the motor rotor, preventing the rotor of the three-phase permanent magnet motor 4 from rotating. This generates a corresponding external pulling resistance on the external rope end, preventing a sudden loss of resistance and potential fall due to power failure.

[0053] Compared to existing technologies that use mechanical electromagnetic friction plate resistance brakes mounted on motor shafts, this application replaces expensive and bulky mechanical motor electromagnetic brakes with a low-cost and small-volume electromagnetic switch 2. This reduces the cost, installation size, installation accuracy requirements, power consumption, and heat generation of rope strength training equipment while improving the response speed of resistance maintenance. It solves the problems of high cost, slow response speed, large installation size, high installation accuracy requirements, high power consumption, and high heat generation associated with using mechanical electromagnetic friction plate resistance brakes mounted on motor shafts for resistance maintenance in rope strength training equipment.

[0054] There are no specific limitations on the number and type of electromagnetic switches 2; they can be selected according to actual needs. The only requirement is that when the coil of electromagnetic switch 2 is de-energized (i.e., the rope strength trainer is de-energized), at least two of the first, second, and third motor wires of the three-phase permanent magnet motor 4 are short-circuited through the normally closed contacts of electromagnetic switch 2. For example, a single-pole single-throw electromagnetic switch containing a set of normally closed contacts or a single-pole double-throw electromagnetic switch containing a set of normally closed contacts and a set of normally open contacts can be selected. This set of normally closed contacts is connected between any two of the first, second, and third motor wires of the three-phase permanent magnet motor 4.

[0055] In another exemplary embodiment of this application, to improve the response speed of the cable strength trainer to interrupt resistance force, such as Figure 2As shown, the normally closed contacts mentioned above are provided in two sets, wherein:

[0056] The first set of normally closed contacts is connected between the first motor line and the second motor line, and the second set of normally closed contacts is connected between the third motor line and the second motor line or between the third motor line and the first motor line.

[0057] like Figure 2 As shown, the first set of normally closed contacts can be connected between the motor lines of the three-phase permanent magnet motor 4 that are connected to the W phase and V phase of the three-phase AC power, and the second set of normally closed contacts can be connected between the motor lines of the three-phase permanent magnet motor 4 that are connected to the V phase and U phase of the three-phase AC power.

[0058] In another exemplary embodiment of this application, such as Figure 2 As shown, in order to improve the insulation effect of the two sets of normally closed contacts, the two sets of normally closed contacts are respectively set in the two electromagnetic switches 2, that is, there are two electromagnetic switches 2, and each electromagnetic switch 2 is provided with at least one set of normally closed contacts.

[0059] In this embodiment, the selection of each electromagnetic switch 2 is not specifically limited; it can be selected according to actual needs. For example, each electromagnetic switch 2 can be a single-pole single-throw electromagnetic switch containing a set of normally closed contacts or a single-pole double-throw electromagnetic switch containing a set of normally closed contacts and a set of normally open contacts. For example, one electromagnetic switch 2 can be a single-pole single-throw electromagnetic switch containing a set of normally closed contacts, and another electromagnetic switch 2 can be a single-pole double-throw electromagnetic switch containing a set of normally closed contacts and a set of normally open contacts. As another example, at least one electromagnetic switch 2 can be an electromagnetic switch containing at least two sets of synchronously operating and mutually insulated normally closed contacts. If one electromagnetic switch 2 is an electromagnetic switch containing at least two sets of synchronously operating and mutually insulated normally closed contacts, wherein the at least two sets of synchronously operating and mutually insulated normally closed contacts are opened / closed by at least one coil through energization / de-energization control, the other electromagnetic switch 2 can be a single-pole single-throw electromagnetic switch containing a set of normally closed contacts or a single-pole double-throw electromagnetic switch containing a set of normally closed contacts and a set of normally open contacts.

[0060] In another exemplary embodiment of this application, to reduce costs, the two sets of normally closed contacts described above are disposed within an electromagnetic switch 2.

[0061] In this embodiment, the electromagnetic switch 2 can be selected as an electromagnetic switch containing at least two sets of normally closed contacts that operate synchronously and are mutually insulated.

[0062] In another exemplary embodiment of this application, such as Figure 3 As shown, there are three sets of normally closed contacts. The first contacts of the three sets of normally closed contacts are connected together, and the second contacts of the three sets of normally closed contacts are connected to the first motor line, the second motor line, and the third motor line respectively.

[0063] In this embodiment, the second contact of each of the three normally closed contacts is connected to a corresponding first motor wire, a second motor wire, and a third motor wire, meaning that the second contact of each normally closed contact is connected to a motor wire. For example, the second contact of the first normally closed contact is connected to the first motor wire, the second contact of the second normally closed contact is connected to the second motor wire, and the second contact of the third normally closed contact is connected to the third motor wire.

[0064] In another exemplary embodiment of this application, such as Figure 3 As shown, in order to improve the insulation effect of the three sets of normally closed contacts, the three sets of normally closed contacts are respectively set in the three electromagnetic switches 2, that is, there are three electromagnetic switches 2, and each electromagnetic switch 2 has at least one set of normally closed contacts.

[0065] In this embodiment, the selection of each electromagnetic switch 2 is not specifically limited; it can be selected according to actual needs. For example, each electromagnetic switch 2 can be a single-pole single-throw electromagnetic switch containing a set of normally closed contacts, a single-pole double-throw electromagnetic switch containing a set of normally closed contacts and a set of normally open contacts, or an electromagnetic switch containing at least two sets of synchronously operating and mutually insulated normally closed contacts. For example, any one or two electromagnetic switches 2 can be a single-pole single-throw electromagnetic switch containing a set of normally closed contacts, and the remaining electromagnetic switches 2 can be a single-pole double-throw electromagnetic switch containing a set of normally closed contacts and a set of normally open contacts. As another example, at least one electromagnetic switch 2 can be an electromagnetic switch containing at least two sets of synchronously operating and mutually insulated normally closed contacts. If one or two electromagnetic switches 2 are selected as electromagnetic switches containing at least two sets of synchronously operating and mutually insulated normally closed contacts, the remaining electromagnetic switches 2 can be a single-pole single-throw electromagnetic switch containing a set of normally closed contacts or a single-pole double-throw electromagnetic switch containing a set of normally closed contacts and a set of normally open contacts.

[0066] In another exemplary embodiment of this application, in order to improve the insulation effect of the three sets of normally closed contacts while reducing costs, the three sets of normally closed contacts are disposed in two electromagnetic switches 2, wherein the first electromagnetic switch 2 is provided with at least two sets of normally closed contacts, and the second electromagnetic switch 2 is provided with at least one set of normally closed contacts.

[0067] In this embodiment, the selection of the two electromagnetic switches 2 is not specifically limited; they can be selected according to actual needs. For example, the first electromagnetic switch 2 can be an electromagnetic switch containing at least two sets of synchronously operating and mutually insulated normally closed contacts, and the second electromagnetic switch 2 can be a single-pole single-throw electromagnetic switch containing one set of normally closed contacts or a single-pole double-throw electromagnetic switch containing one set of normally closed contacts and one set of normally open contacts. Alternatively, both electromagnetic switches 2 can be electromagnetic switches containing at least two sets of synchronously operating and mutually insulated normally closed contacts.

[0068] In another exemplary embodiment of this application, to further reduce costs, the three sets of normally closed contacts described above are disposed within an electromagnetic switch 2.

[0069] In this embodiment of the application, the electromagnetic switch 2 is selected as an electromagnetic switch containing at least three sets of synchronously operating and mutually insulated normally closed contacts, wherein the at least three sets of synchronously operating and mutually insulated normally closed contacts are opened / closed by at least one coil through synchronous control of energization / de-energization.

[0070] In another exemplary embodiment of this application, such as Figure 2-3 As shown, the VCC output terminal (positive terminal) of the power converter 1 is connected to the first terminal of the coil of the electromagnetic switch 2, and the GND output terminal (ground terminal) of the power converter 1 is connected to the second terminal of the coil of the electromagnetic switch 2 via the intermediate control unit.

[0071] In this embodiment, the intermediate control unit functions as follows: when the rope strength training device is powered, it ensures that even in standby mode, there is resistance preventing the rope from being pulled. In standby mode, the output of the input power module 3 is off, and the three-phase permanent magnet motor 4 is not driven. In standby mode, the intermediate control unit controls the coil of the electromagnetic switch 2 to be de-energized, ensuring that all contacts are normally closed, similar to a power-off state, thus preventing the rope from being pulled even in standby mode.

[0072] The specific structure of the intermediate control unit is not limited and can be set according to actual needs, as long as it can control the coil of the electromagnetic switch 2 to be energized or de-energized according to the output of the input power module 3. For example, a transistor can be used as the intermediate control unit. Another example is using a MOSFET as the intermediate control unit.

[0073] When the rope strength training equipment is in standby mode (i.e., the output of the input power module 3 is not energized), the intermediate control unit is disconnected, and the circuit between the power converter 1 and the electromagnetic switch 2 is open. This means the coil of the electromagnetic switch 2 is de-energized, and the electromagnetic switch 2 closes, providing resistance. Once the output of the input power module 3 is energized, the intermediate control unit switches to the closed state, thereby connecting the circuit between the power converter 1 and the electromagnetic switch 2. This means the coil of the electromagnetic switch 2 is energized, the electromagnetic switch 2 opens, and the rope strength training equipment operates normally.

[0074] In another exemplary embodiment of this application, such as Figure 2-3 As shown, an induced voltage discharge diode is connected in parallel across the coil of each electromagnetic switch 2. Figure 2 D5, D6 Figure 3 (D5, D6, D7).

[0075] In this embodiment, the induced voltage discharge diode is used for the discharge protection of the coil induced electromotive force of each electromagnetic switch 2.

[0076] In another exemplary embodiment of this application, the two ends of the coil of the electromagnetic switch 2 are connected to the first end of the first interface, the second end of the first interface is used to connect to the power converter 1, each normally closed contact of the electromagnetic switch 2 is connected to the first end of the second port, and the second end of the second port is used to connect to the first motor line, the second motor line or the third motor line of the three-phase permanent magnet motor 4.

[0077] In this embodiment, the electromagnetic switch 2 can be connected between the power converter 1 and the three-phase permanent magnet motor 4 through the first interface and the second interface, realizing an independent modular design that facilitates replacement and maintenance.

[0078] In another exemplary embodiment of this application, such as Figure 2-3 As shown, the above-mentioned input power module 3 includes a third interface 5 and a power conversion circuit, wherein the first end of the third interface 5 is connected to a DC voltage or a standard AC voltage.

[0079] In this embodiment, the standard AC voltage can be a standard AC input voltage such as 220V or 110V. The DC voltage can be a converted DC voltage (such as 12V / 24V / 36V / 48V) or a DC voltage provided by an energy storage battery (such as 12V / 24V / 36V / 48V).

[0080] If the first terminal of the third interface 5 is connected to a DC voltage, the power conversion circuit includes a filter circuit 6 and a three-phase inverter circuit 7 connected in sequence, wherein:

[0081] The input terminal of the filter circuit 6 is connected to the second terminal of the third interface 5, and the output terminal of the three-phase inverter circuit 7 is connected to the first motor line, the second motor line, and the third motor line respectively.

[0082] If the first terminal of the third interface 5 is connected to a standard AC voltage, the power conversion circuit also includes a rectifier circuit 8. The input terminal of the rectifier circuit 8 is connected to the second terminal of the third interface 5, and the output terminal of the rectifier circuit 8 is connected to the input terminal of the filter circuit 6.

[0083] The input terminal of the power converter 1, the second terminal of the first interface, the output terminal of the filter circuit 6, or the output terminal of the rectifier circuit 8 are connected to the second terminal of the third interface 5.

[0084] In another exemplary embodiment of this application, such as Figure 2-3 As shown, the filter circuit 6 described above includes a filter capacitor C1.

[0085] In another exemplary embodiment of this application, the three-phase inverter circuit 7 described above adopts a full-bridge inverter circuit.

[0086] In another exemplary embodiment of this application, such as Figure 2-3 As shown, the full-bridge inverter circuit described above includes switching transistors Q1, Q2, Q3, Q4, Q5, and Q6. The gates of switching transistors Q1 through Q6 are connected to external control signals. The sources of switching transistors Q1, Q2, and Q3 are connected to the positive DC voltage DC+. The drains of switching transistors Q4, Q5, and Q6 are grounded to GND. The drain of switching transistor Q1 is connected to the source of switching transistor Q4, the drain of switching transistor Q2 is connected to the source of switching transistor Q5, and the drain of switching transistor Q3 is connected to the source of switching transistor Q6.

[0087] In this embodiment, the positive DC voltage DC+ can be the positive terminal of the DC voltage output after the standard AC voltage passes through the rectifier circuit 8 and the filter capacitor C1, or it can be the positive terminal of the DC voltage provided by an external DC voltage source directly connected to the full-bridge inverter circuit or an energy storage battery (such as a lithium battery).

[0088] In another exemplary embodiment of this application, the rectifier circuit 8 described above is a bridge rectifier circuit.

[0089] In the embodiments of this application, such as Figure 2-3 As shown, the bridge rectifier circuit includes diodes D1, D2, D3 and D4. The cathodes of diodes D1 and D2 are connected to the positive terminal of the DC voltage DC+, the anode of diode D1 is connected to the cathode of diode D3, the anode of diode D2 is connected to the cathode of diode D4, and the anodes of diodes D3 and D4 are grounded.

[0090] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A corded strength training apparatus de-energized resistance maintenance circuit, comprising: The resistance-maintaining circuit of the rope strength training device includes a power converter (1) and at least one electromagnetic switch (2), wherein: The input end of the power converter (1) is connected to the input power module (3) of the rope strength training device, and the output end of the power converter (1) is connected to both ends of the coil of the electromagnetic switch (2). The electromagnetic switch (2) includes at least one set of normally closed contacts. At least two of the first motor wire, second motor wire, and third motor wire of the three-phase permanent magnet motor (4) of the rope strength training device are connected to at least one set of the normally closed contacts. The first motor wire is connected to any one of the U, V, and W phases of the input AC power, and the second and third motor wires are connected to the remaining two phases of the input AC power.

2. The rope strength training apparatus dead band resistance maintenance circuit of claim 1, wherein, The electromagnetic switch (2) includes at least one of an electromagnetic relay and a contactor; The normally closed contacts are provided in two sets, wherein: The first set of normally closed contacts is connected between the first motor line and the second motor line, and the second set of normally closed contacts is connected between the third motor line and the second motor line or between the third motor line and the first motor line.

3. The rope strength training apparatus dead band resistance maintenance circuit of claim 2, wherein, The two sets of normally closed contacts are disposed within one electromagnetic switch (2).

4. The rope strength training apparatus dead band resistance maintenance circuit of claim 2, wherein, The two sets of normally closed contacts are respectively set in the two electromagnetic switches (2).

5. The rope strength training apparatus dead band resistance maintenance circuit of claim 1, wherein, The electromagnetic switch (2) includes at least one of an electromagnetic relay and a contactor; The normally closed contacts are provided in three sets, of which: The first contacts of the three sets of normally closed contacts are connected together, and the second contacts of the three sets of normally closed contacts are connected one-to-one with the first motor line, the second motor line and the third motor line.

6. The rope strength training apparatus dead band resistance maintenance circuit of claim 5, wherein, The three sets of normally closed contacts are disposed within one electromagnetic switch (2).

7. The resistance-maintaining circuit for the rope strength training device according to claim 5, characterized in that, The three sets of normally closed contacts are respectively set in the three electromagnetic switches (2).

8. The resistance-maintaining circuit for the rope strength training device according to claim 5, characterized in that, The three sets of normally closed contacts are disposed in the two electromagnetic switches (2), wherein the first electromagnetic switch (2) is provided with two sets of normally closed contacts, and the second electromagnetic switch (2) is provided with one set of normally closed contacts.

9. The rope strength training apparatus dead band resistance maintenance circuit of claim 1 wherein, Each of the electromagnetic switches (2) has an induced voltage discharge diode connected in parallel across its coil. The two ends of the coil of the electromagnetic switch (2) are connected to the first end of the first interface, and the second end of the first interface is used to connect to the power converter (1). Each normally closed contact of the electromagnetic switch (2) is connected to the first end of the second port, and the second end of the second port is used to connect to the first motor line, the second motor line or the third motor line.

10. The corded strength training apparatus dead band resistance maintenance circuit of any one of claims 1-9, wherein, The input power module (3) includes a third interface (5) and a power conversion circuit, wherein: The first end of the third interface (5) is connected to a DC voltage or a standard AC voltage; If the first terminal of the third interface (5) is connected to a DC voltage, the power conversion circuit includes a filter circuit (6) and a three-phase inverter circuit (7) connected in sequence, wherein: The input terminal of the filter circuit (6) is connected to the second terminal of the third interface (5), and the output terminal of the three-phase inverter circuit (7) is connected to the first motor line, the second motor line and the third motor line respectively. If the first terminal of the third interface (5) is connected to a standard AC voltage, the power conversion circuit further includes a rectifier circuit (8), wherein: The input terminal of the rectifier circuit (8) is connected to the second terminal of the third interface (5), and the output terminal of the rectifier circuit (8) is connected to the input terminal of the filter circuit (6). The input terminal of the power converter (1) or the second terminal of the first interface is connected to the second terminal of the third interface (5).

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