Permanent magnet synchronous speed reducer for intelligent storage
By using a combination of permanent magnet synchronous reducer and inverter in the intelligent storage system, the problems of low efficiency and large speed fluctuations in the asynchronous motor-driven reducer equipment are solved, efficient and safe operation is achieved, cost is reduced, and system improvement is improved overall performance.
Patent Information
- Application Number
- CN202420978391.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-08
AI Technical Summary
The reduced gear equipment driven by existing asynchronous motors is low in efficiency and large fluctuations in speed, resulting in reduced system control accuracy, affecting safe and reliable operation, and is costly.
The combination of permanent magnet synchronous reducer and inverter is adopted to achieve current measurement error correction through the inverter's three-phase current sensor, balance the three-phase current, and combine the integrated controller and thermal isolation structure to improve system efficiency and safety.
It improves the efficiency and safety of the system, reduces costs, improves personal economic security, and increases efficiency to 85%~90%.
Smart Images
Figure CN222366165U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of intelligent warehousing reducers, and in particular relates to a permanent magnet synchronous reducer used for intelligent warehousing. Background Art
[0002] As the core equipment of intelligent warehousing power transmission, reducers have the characteristics of large quantity demand and high power requirements, and belong to the group of high-cost and high-energy-consuming equipment. Reducers are usually composed of motors and reducers.
[0003] Due to the advantages of asynchronous motors such as mature technology, simple operation, direct connection to 380V power supply and low price of asynchronous motors themselves, most of the reducer equipment in the industry is driven by asynchronous motors.
[0004] The efficiency of the reducer equipment driven by asynchronous motor is 60%~70%. Asynchronous motors also require additional excitation current, have large reactive power, and the speed will fluctuate with the load, with a fluctuation range of ±5%.
[0005] Asynchronous motors generate a lot of heat. In actual applications, current measurement errors are caused by factors such as temperature drift (changes in device parameters caused by temperature changes). Current measurement errors can reduce system control accuracy and make it impossible to operate stably, induce torque pulsation, and further amplify speed fluctuations. Speed fluctuations can affect the safe and reliable operation of the system and threaten personal and economic safety.
[0006] In view of this, how to solve the defects existing in the above technical solutions has become one of the problems to be solved urgently in the technical field of permanent magnet synchronous motor reduction devices. Utility Model Content
[0007] In view of the problems existing in the background technology, the utility model provides a permanent magnet synchronous reducer for intelligent warehousing, comprising: a permanent magnet synchronous reducer body, the permanent magnet synchronous reducer body comprising a permanent magnet synchronous motor, a reducer connected to the permanent magnet synchronous motor;
[0008] An inverter for converting a DC power supply into an AC power required by the permanent magnet synchronous motor, and connected to the permanent magnet synchronous motor, wherein an input port of the inverter is connected to a DC power supply;
[0009] The three groups of output ports provided in the inverter are respectively connected to the three-phase winding interfaces of the permanent magnet synchronous motor, and are used to convert the DC power supply into AC power supplied to the permanent magnet synchronous motor;
[0010] Wherein, a first current sensor and a second current sensor are arranged on the two branches of the inverter.
[0011] Optionally, the positive port of the DC power supply is connected to the port P of the inverter, and the negative port of the DC power supply is connected to the port N of the inverter (P is the positive pole of the bus, and N is the negative pole of the bus).
[0012] Optionally, a capacitor (CDC) is connected in parallel across the DC power supply
[0013] Optionally, the three-phase windings of the permanent magnet synchronous motor are respectively A-phase winding, B-phase winding and C-phase winding; the three groups of output ports of the inverter are respectively A-phase interface, B-phase interface and C-phase interface; wherein the A-phase winding, B-phase winding and C-phase winding of the reducer are respectively connected to the corresponding A-phase interface, B-phase interface and C-phase interface of the inverter;
[0014] A first current sensor is provided on a connecting branch between the A-phase winding and the A-phase interface, and a second current sensor is provided on a connecting branch between the B-phase winding and the B-phase interface;
[0015] Specifically, the input cable of the A-phase winding and the input cable of the B-phase winding respectively pass through the corresponding signal acquisition port of the first current sensor and the signal acquisition port of the second current sensor to achieve closed-loop control of the current, and the cable input to the inverter also passes through the signal acquisition port of the first current sensor and the signal acquisition port of the second current sensor respectively.
[0016] Optionally, the reducer is provided with a protective housing, and the protective housing is provided with a first interface and a second interface; wherein the first interface and the second interface both adopt I / O control interfaces;
[0017] The first interface and the second interface are used to connect the 380V industrial power supply and the control cable respectively. The first interface and the second interface can be used to send control instructions to achieve related control functions, such as start / stop, forward / reverse, etc.
[0018] Optionally, the permanent magnet synchronous motor and the reducer are integrated into one body, and the whole adopts a horizontal structure.
[0019] Optionally, a thermal isolation structure (not annotated in the figure) is fixedly installed inside the permanent magnet synchronous reducer body, which is divided into two groups of independently arranged air ducts by the thermal isolation structure, and the two groups of independently arranged air ducts are respectively provided with the permanent magnet synchronous motor and the reducer, so that the permanent magnet synchronous motor and the reducer are independently arranged. When used, the heat of the permanent magnet synchronous motor will not be transferred to the inside of the reducer, thereby ensuring the operating ambient temperature of the reducer.
[0020] Optionally, the protective shell arranged at the position of the reducer air duct is installed with at least two sets of cooling fans, so that the cold air is connected to the reducer air duct.
[0021] Optionally, a heat dissipation structure is provided on the protective shell.
[0022] Optionally, the thermal isolation structure adopts a heat insulation board.
[0023] A controller is arranged inside the protective shell, and the controller is integrated by a reducer controller, an inverter controller and a permanent magnet synchronous motor controller.
[0024] Optionally, an oil leakage groove is provided on the protective housing at the connection position between the reducer and the permanent magnet synchronous motor. During installation, the oil leakage groove only needs to be installed directly below the connection end surface between the permanent magnet synchronous motor and the reducer, and fixed to the protective housing with fixing screws, so that it is easy to disassemble and check.
[0025] In summary, the beneficial effects of the utility model are:
[0026] The utility model adds an inverter, and a first current sensor and a second current sensor are arranged on the two-phase branches A and B of the inverter; and the input cables of the A-phase winding and the B-phase winding of the permanent magnet synchronous reducer body are respectively connected; and the adverse effects caused by the current measurement error are further reduced, so that the true values of the three-phase currents are equivalent to having approximately equal gains, and balanced three-phase currents are obtained, thereby eliminating the torque and speed fluctuations caused by the current measurement error; improving the characteristics of safe and reliable operation of the system, and improving personal and economic safety.
[0027] The utility model can change the rotation speed and the acceleration of the starting and stopping process according to different working conditions and requirements by adding the first interface and the second interface.
[0028] The utility model provides a permanent magnet synchronous reducer body to replace the traditional asynchronous motor drive reducer method, thereby greatly reducing the cost compared with other products and improving the profit margin of the product.
[0029] The utility model provides a permanent magnet synchronous reducer body to replace the traditional asynchronous motor drive reducer method, and is used in conjunction with an inverter. The inverter frequency conversion control is utilized to further improve the efficiency, and the efficiency is increased from 60%~70% of the original asynchronous motor to 85%~90%. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 A schematic diagram of the overall structure provided for one embodiment of the utility model;
[0031] Figure 2 A right side view of a permanent magnet synchronous reducer body provided in one embodiment of the utility model;
[0032] Figure 3 for Figure 1An enlarged view of the structure at position A shown in FIG.
[0033] Figure 4 for Figure 1 A topological structure diagram of a permanent magnet synchronous reducer drive system with a current measurement error correction function provided by an embodiment of the utility model.
[0034] The marks in the figure are explained as follows:
[0035] 80. Permanent magnet synchronous reducer body;
[0036] Permanent magnet synchronous motor; 20, first interface; 30, protective housing; 50, heat dissipation structure; 60, cooling fan; 70, reducer; 110, oil leakage groove; 120, inverter; 130, first current sensor; 140, second current sensor; 150, second interface. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Although exemplary embodiments are disclosed in the accompanying drawings, it should be understood that the utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to facilitate a thorough understanding of the utility model and to fully convey the concept of the utility model to those skilled in the art.
[0038] See also Figures 1 to 4 As shown, an embodiment of the utility model provides a permanent magnet synchronous reducer for intelligent warehousing, including a permanent magnet synchronous reducer body 80 , wherein the permanent magnet synchronous reducer body 80 includes a permanent magnet synchronous motor 10 and a reducer 70 , and the reducer 70 is connected to the permanent magnet synchronous motor 10 .
[0039] The inverter 120 is used to convert a DC power supply into an AC power required by the permanent magnet synchronous motor 10 and is connected to the permanent magnet synchronous motor 10. The input port of the inverter 120 is connected to a DC power supply (VDC); the three groups of output ports provided by the inverter 120 are respectively connected to the three-phase winding interfaces of the permanent magnet synchronous motor 10; and the inverter 120 is used to convert a DC power supply into an AC power supplied to the permanent magnet synchronous motor 10.
[0040] A first current sensor 130 and a second current sensor 140 are respectively disposed on the two branches of the inverter 120 .
[0041] Those skilled in the art should be able to understand that the permanent magnet synchronous reducer for intelligent warehousing provided in this embodiment, in the process of actual application, adjusts the balance between the three-phase currents through the inverter 120, the first current sensor 130 and the second current sensor 140. For example, by adding a current sensor, the current value of each phase can be accurately measured, and adjusted through the inverter to obtain a balanced three-phase current. For example, since the inverter itself has the function of converting DC power into AC power, and PWM (pulse width modulation) technology is usually used to control the output voltage and frequency, the inverter can achieve precise regulation and control of the three-phase current.
[0042] In order to minimize the problem of speed fluctuation affecting the safe and reliable operation of the system and threatening personal and economic safety, the positive port of the DC power supply is connected to the port P of the inverter 120, and the negative port of the DC power supply is connected to the port N of the inverter 120 (port P is the positive pole of the bus, and port N is the negative pole of the bus). The two ends of the DC power supply are connected in parallel with a capacitor (CDC).
[0043] Furthermore, the topological structure of the permanent magnet synchronous reducer drive system with current measurement error correction function proposed in the utility model is shown in FIG4 , the three-phase windings of the permanent magnet synchronous motor 10 are respectively A-phase winding, B-phase winding and C-phase winding; the three groups of output ports of the inverter 120 are respectively A-phase interface, B-phase interface and C-phase interface; wherein the A-phase winding, B-phase winding and C-phase winding of the reducer are respectively connected to the A-phase interface, B-phase interface and C-phase interface of the corresponding inverter 120;
[0044] A first current sensor 130 is provided on the connecting branch between the A-phase winding and the A-phase interface, and a second current sensor 140 is provided on the connecting branch between the B-phase winding and the B-phase interface;
[0045] Specifically, the input cable of the A-phase winding and the input cable of the B-phase winding respectively pass through the corresponding signal acquisition port of the first current sensor 130 and the signal acquisition port of the second current sensor 140 to achieve closed-loop control of the current, and the cable of the input inverter 120 also passes through the signal acquisition port of the first current sensor 130 and the signal acquisition port of the second current sensor 140 respectively.
[0046] When correcting the current measurement error, a five-segment SVPWM (without using V7) is used, and the current sampling value at the moment of zero vector V0 is used to realize current closed-loop control. The relationship between the DC bus current and the phase current at different voltage vector action moments is used to realize the calculation of the current measurement error.
[0047] Furthermore, the utility model proposes a permanent magnet synchronous reducer for intelligent warehousing. Figure 1As shown, the permanent magnet synchronous motor 10 and the reducer 70 are arranged in a horizontal structure as a whole. A controller (not annotated in the figure) is arranged inside the protective housing 30. The controller is integrated with the reducer controller, the inverter controller and the permanent magnet synchronous motor controller, and does not require many cables and independent placement space. Instead of the current variable frequency reduction permanent magnet synchronous motor controller which usually adopts an external architecture setting, the integrated design is more concise.
[0048] Furthermore, the utility model proposes a permanent magnet synchronous reducer for intelligent warehousing. Figure 1 As shown, the reducer 70 is provided with a protective housing 30, and the protective housing 30 is provided with a first interface 20 and a second interface 150; wherein the first interface 20 and the second interface 150 both adopt I / O control interfaces;
[0049] The first interface 20 and the second interface 150 are used to connect the 380V industrial power supply and the control cable, respectively. The first interface 20 and the second interface 150 can be used to send control instructions for data transmission. Through the first interface 20 and the second interface 150, the control signal can be sent to the control system of the permanent magnet synchronous reducer 80 through the controller, thereby realizing related control functions, and then controlling the speed, forward / reverse direction, start / stop, etc. of the permanent magnet synchronous reducer 80.
[0050] It should be noted that the utility model can be equipped with different operating speed control, acceleration setting, speed control and other requirements by adding a first interface and a second interface, such as setting multiple operating speeds and other functions, which can be specifically equipped according to needs. In order to solve the problem that the reducer driven by the traditional asynchronous motor is relatively large in size and weight, and is often directly driven by industrial three-phase electricity, it is impossible to set the speed, start and stop time, etc. When the industrial three-phase electric drive is used directly, the permanent magnet synchronous motor has excessive acceleration when starting and stopping, and the speed is fixed. Since the reducer directly driven by the industrial three-phase electric drive cannot adjust the speed of the permanent magnet synchronous motor. Once a sudden acceleration or deceleration occurs, causing heavy cargo to lose control due to inertia, it will cause large economic losses and may even threaten personal safety.
[0051] See also Figure 1~2 As shown, this embodiment provides a permanent magnet synchronous reducer for intelligent warehousing, with a thermal isolation structure (not annotated in the figure) fixedly installed inside, and the inner cavity of the permanent magnet synchronous reducer body 80 is divided into two groups of independently arranged air ducts by the thermal isolation structure, and the two groups of independent air ducts are respectively provided with controllers of the permanent magnet synchronous motor 10 and the reducer 70, so that the permanent magnet synchronous motor 10 and the reducer 70 are independently arranged. When used, the heat of the permanent magnet synchronous motor will not be transferred to the inside of the reducer 70, thereby ensuring the operating environment temperature of the reducer.
[0052] Furthermore, the protective shell 30 arranged at the air duct position of the reducer 70 is installed with at least two sets of cooling fans 60, so that the cold air is connected to the reducer air duct. The cooling fan can be a TYJ series cooling fan or other cooling fans with cooling function.
[0053] It should be noted that, in actual application, heat is dissipated by a heat dissipation fan.
[0054] Furthermore, a heat dissipation structure 50 is provided on the protective shell 30, and the heat dissipation structure 50 is arranged in two groups, one group is arranged on the two side walls of the protective shell 30, and the other group is arranged on the front end surface of the protective shell 30 (the end surface of the protective shell 30 away from the permanent magnet synchronous motor).
[0055] It should be noted that in order to minimize the current measurement error caused by factors such as temperature drift (changes in device parameters caused by temperature changes), a heat dissipation structure 50 is provided on the protective shell 30. In actual application, cold air first flows through the bottom surface of the insulation structure (the surface of the permanent magnet synchronous motor), and a large amount of heat is taken away by the heat dissipation structure located on the two side walls of the protective shell 30 (this part of heat will not flow through the air duct of the reducer).
[0056] Furthermore, the thermal isolation structure adopts a thermal insulation board.
[0057] See also Figure 1 and 3 As shown, this embodiment provides a permanent magnet synchronous reducer for intelligent warehousing, including a permanent magnet synchronous motor 10, a reducer 70 connected to the permanent magnet synchronous motor 10, and an oil leakage groove 110 is provided on the protective housing 30 at the connection position between the reducer 70 and the permanent magnet synchronous motor 10. During installation, the oil leakage groove 11 only needs to be installed directly below the end surface where the permanent magnet synchronous motor 10 and the reducer are connected, and fixed to the protective housing 30 with fixing screws, so that it is easy to disassemble and view.
[0058] It should be noted that the utility model prevents occasional oil leakage by adding an oil leakage groove, thereby ensuring that the logistics storage operation environment is not polluted.
[0059] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0060] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.
[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not restrictive. Although the utility model is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solution of the utility model does not deviate from the spirit and scope of the technical solution of the utility model, and should be included in the scope of the claims of the utility model.
Claims
1. A permanent magnet synchronous reducer for intelligent warehousing, comprising a permanent magnet synchronous reducer body (80), wherein the permanent magnet synchronous reducer body (80) is provided with a permanent magnet synchronous motor (10) and a reducer (70) connected to the permanent magnet synchronous motor (10); It is characterized in that Also includes: An inverter (120) for converting a DC power supply into an AC power required by the permanent magnet synchronous motor (10), wherein an input port of the inverter (120) is connected to the DC power supply; The three groups of output ports provided on the inverter (120) are respectively connected to the three-phase winding interfaces of the permanent magnet synchronous motor (10); Wherein, a first current sensor (130) and a second current sensor (140) are respectively arranged on two branches of the inverter (120).
2. The permanent magnet synchronous reducer for intelligent warehousing according to claim 1 is characterized in that: The positive port of the DC power supply is connected to the port P of the inverter (120), and the negative port of the DC power supply is connected to the port N of the inverter (120).
3. The permanent magnet synchronous reducer for intelligent warehousing according to claim 2 is characterized in that: Capacitors are connected in parallel at both ends of the DC power supply.
4. The permanent magnet synchronous reducer for intelligent warehousing according to claim 1 is characterized in that: The three-phase windings of the permanent magnet synchronous motor (10) are respectively an A-phase winding, a B-phase winding and a C-phase winding; the three groups of output ports of the inverter (120) are respectively an A-phase interface, a B-phase interface and a C-phase interface; The A-phase winding, the B-phase winding and the C-phase winding of the permanent magnet synchronous motor (10) are respectively connected to the A-phase interface, the B-phase interface and the C-phase interface of the corresponding inverter (120); A first current sensor (130) is provided on a connecting branch between the A-phase winding and the A-phase interface, and a second current sensor (140) is provided on a connecting branch between the B-phase winding and the B-phase interface.
5. The permanent magnet synchronous reducer for intelligent warehousing according to claim 1 is characterized in that: The reducer (70) is provided with a protective housing (30), and the protective housing (30) is provided with a first interface (20) and a second interface (150); the first interface (20) and the second interface (150) both adopt I / O control interfaces.
6. The permanent magnet synchronous reducer for intelligent warehousing according to claim 1, characterized in that: A thermal isolation structure is installed inside the permanent magnet synchronous reducer body (80), which is divided into two groups of independently arranged air ducts by the thermal isolation structure, and the two groups of independently arranged air ducts are respectively provided with the permanent magnet synchronous motor (10) and the reducer (70).
7. The permanent magnet synchronous reducer for intelligent warehousing according to claim 6 is characterized in that: At least two groups of cooling fans (60) are installed on the protective housing (30) of the permanent magnet synchronous reducer body (80) arranged at the air duct position of the reducer (70).
8. The permanent magnet synchronous reducer for intelligent warehousing according to claim 7, characterized in that: The protection shell (30) is provided with a heat dissipation structure (50).
9. The permanent magnet synchronous reducer for intelligent warehousing according to claim 6, characterized in that: The thermal isolation structure adopts thermal insulation board.
10. The permanent magnet synchronous reducer for intelligent warehousing according to claim 5, characterized in that: An oil leakage groove (110) is provided on the protective housing (30) at a position where the reducer (70) and the permanent magnet synchronous motor (10) are connected.