Motor soft start energy-saving control protection device

Abstract

The utility model discloses a motor soft start energy-saving control protection device, which is characterized in that when a motor is started, a switch unit controls the motor to be conducted with a frequency conversion unit, the frequency conversion unit controls the voltage frequency output to the motor to gradually rise from 0 to the voltage frequency of a power supply so as to realize the soft start of the motor, and then the switch unit performs switching so as to realize the soft start of the motor. The switch unit enables the motor to be directly connected with the power supply, at the moment, the frequency conversion unit stops working, the motor is directly connected with the power supply, after the motor is started, the current sampling unit can sample power supply current of the power supply to the motor, and when the power supply current is interrupted, the control unit can control the frequency conversion unit and the switch unit to work. And soft start of the motor is carried out again. According to the utility model, soft start of the motor can be realized, and the frequency conversion unit stops working after the motor is started so as to reduce extra electric energy loss.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor soft-start energy-saving control and protection device. Background Art

[0002] At present, AC motors are used in power equipment in various industries. Generally, the AC motors are directly driven by the power grid. However, when the AC motor is driven, it is often accompanied by several times of impact current. This impact current can easily cause damage to the motor. In order to solve the above problems, there are currently some solutions that use inverters to soft-start the AC motor. However, after starting the motor, the inverter will also be involved in the work for a long time, which will cause additional energy loss. Utility Model Content

[0003] The present application provides a motor soft-start energy-saving control protection device, which can realize motor soft-start and stop the frequency conversion unit after starting the motor to reduce additional power loss.

[0004] The motor soft-start energy-saving control protection device provided in the present application includes a power supply, a rectifier unit, a voltage sampling unit, a frequency conversion unit, a switch unit, a current sampling unit, a control unit and a motor;

[0005] The input end of the rectifier unit is electrically connected to the power supply, the output end of the rectifier unit is electrically connected to the input end of the frequency conversion unit, the output end of the frequency conversion unit is connected to the first input end of the switch unit, the output end of the switch unit is electrically connected to the motor, the voltage sampling unit is connected to the power supply and the signal input end of the frequency conversion unit, the voltage sampling unit is used to collect the voltage frequency of the power supply and transmit it to the frequency conversion unit, the second input end of the switch unit is electrically connected to the power supply, the output end of the switch unit is electrically connected to the motor, and the switch unit is used to control the motor to be turned on with the frequency conversion unit or the power supply;

[0006] The input end of the current sampling unit is connected between the second input end of the switch unit and the power supply, the output end of the current sampling unit is electrically connected to the input end of the control unit, and the output end of the control unit is electrically connected to the control end of the frequency conversion unit and the switch unit respectively.

[0007] Preferably, the motor soft-start energy-saving control and protection device further comprises a temperature detection unit, which is used to detect the temperature of the motor, and the output end of the temperature detection unit is electrically connected to the input end of the control unit.

[0008] Preferably, the temperature detection unit is a temperature sensor.

[0009] Preferably, the motor soft-start energy-saving control and protection device further comprises a communication unit, and the communication unit is electrically connected to the control unit.

[0010] Preferably, the communication unit is an Ethernet communication module.

[0011] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0012] The motor soft-start energy-saving control and protection device of the present application, when the motor starts, the switch unit controls the motor and the frequency conversion unit to be turned on, the frequency conversion unit controls the voltage frequency output to the motor to gradually increase from 0 to the voltage frequency of the power supply to achieve the soft start of the motor, and then the switch unit switches, the switch unit makes the motor and the power supply directly turned on, at this time the frequency conversion unit stops working, and the motor is directly connected to the power supply, in this way, the present application can achieve the soft start of the motor, and the frequency conversion unit stops working after starting the motor to reduce additional energy loss, and after the motor starts, the current sampling unit can sample the power supply current of the power supply to the motor, when the power supply current is interrupted, the control unit can control the frequency conversion unit and the switch unit to work, so as to re-soft-start the motor to protect the normal operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 Schematic diagram of the circuit structure of the first embodiment;

[0015] Figure 2 It is a schematic diagram of the circuit structure of the second embodiment. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0017] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products, or devices.

[0018] Embodiment 1

[0019] like Figure 1 As shown, the motor soft start energy-saving control protection device of this embodiment includes a power supply 10, a rectifier unit 20, a voltage sampling unit 30, a frequency conversion unit 40, a switch unit 50, a current sampling unit 60, a control unit 70 and a motor 80.

[0020] The input end of the rectifier unit 20 is electrically connected to the power supply 10, and the output end of the rectifier unit 20 is electrically connected to the input end of the frequency conversion unit 40. The rectifier unit 20 is used to rectify the alternating current output by the power supply 10 into direct current. The output end of the frequency conversion unit 40 is connected to the first input end of the switch unit 50, and the output end of the switch unit 50 is electrically connected to the motor 80. The voltage sampling unit 30 is connected to the power supply 10 and is electrically connected to the signal input end of the frequency conversion unit 40. The voltage sampling unit 30 is used to collect the voltage frequency of the power supply 10 and transmit it to the frequency conversion unit 40. When the motor 80 starts, the frequency conversion unit 40 controls the voltage frequency output to the motor to gradually increase from 0 to the voltage frequency of the power supply 10 to achieve soft start of the motor 80.

[0021] The second input end of the switch unit 50 is electrically connected to the power supply 10, and the output end of the switch unit 50 is electrically connected to the motor 80. The switch unit 50 is used to control the motor 80 to be conductive with the frequency conversion unit 40 or the power supply 10. The switch unit 50 can switch states to selectively control the motor 80 to be conductive with the frequency conversion unit 40 or the power supply 10.

[0022] When the motor 80 starts, the switch unit 50 controls the motor 80 to be connected with the frequency conversion unit 40, and the frequency conversion unit 40 controls the voltage frequency output to the motor 80 to gradually increase from 0 to the voltage frequency of the power supply 10 to achieve soft start of the motor, and then the switch unit 50 switches, and the switch unit 50 makes the motor 80 directly connected with the power supply 10. At this time, the frequency conversion unit 40 stops working, and the motor 80 is directly connected to the power supply 10.

[0023] The input end of the current sampling unit 60 is connected between the second input end of the switch unit 50 and the power supply 10, the output end of the current sampling unit 60 is electrically connected to the input end of the control unit 70, and the output end of the control unit 70 is electrically connected to the control ends of the frequency conversion unit 40 and the switch unit 50 respectively. The current sampling unit 60 can sample the power supply current of the power supply 10 to the motor 80 and send it to the control unit 70. When the power supply current is interrupted, the control unit 70 can control the frequency conversion unit 40 and the switch unit 50 to work so as to soft-start the motor 80 again.

[0024] Embodiment 2

[0025] like Figure 2 As shown, the motor soft-start energy-saving control protection device of this embodiment adds a temperature detection unit 90 and a communication unit 100 on the basis of the first embodiment. The temperature detection unit 90 is used to detect the temperature of the motor 80. The output end of the temperature detection unit 90 is electrically connected to the input end of the control unit 70. The temperature detection unit 90 sends the detection data to the control unit 70. The communication unit 100 is electrically connected to the control unit 70. In this way, when the motor 80 is working, if the temperature detection unit 90 detects that the temperature of the motor 80 is too high, the control unit 70 controls the motor 80 to stop working for a certain period of time and then soft-starts again, which can effectively protect the operation safety of the motor 80. When the motor 80 is overheated, the control unit 70 can send an alarm signal to the host computer through the communication unit 100.

[0026] The control unit 70 is a microprocessor, the frequency conversion unit 40 is a frequency converter, the temperature detection unit 90 is a temperature sensor, and the communication unit 100 is an Ethernet communication module.

[0027] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. And the above-mentioned specific embodiments of this specification are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0028] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0029] This specification and drawings are merely exemplary illustrations of the present application and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application intends to include these modifications and variations.

Claims

1. A motor soft start energy-saving control protection device, characterized in that: It comprises a power supply (10), a rectifying unit (20), a voltage sampling unit (30), a frequency conversion unit (40), a switch unit (50), a current sampling unit (60), a control unit (70) and a motor (80); The input end of the rectifier unit (20) is electrically connected to the power supply (10), the output end of the rectifier unit (20) is electrically connected to the input end of the frequency conversion unit (40), the output end of the frequency conversion unit (40) is connected to the first input end of the switch unit (50), the output end of the switch unit (50) is electrically connected to the motor (80), the voltage sampling unit (30) is electrically connected to the power supply (10) and the signal input end of the frequency conversion unit (40), the voltage sampling unit (30) is used to collect the voltage frequency of the power supply (10) and transmit it to the frequency conversion unit (40), the second input end of the switch unit (50) is electrically connected to the power supply (10), the output end of the switch unit (50) is electrically connected to the motor (80), and the switch unit (50) is used to control the motor (80) to be conductive with the frequency conversion unit (40) or the power supply (10); The input end of the current sampling unit (60) is connected between the second input end of the switch unit (50) and the power supply (10), the output end of the current sampling unit (60) is electrically connected to the input end of the control unit (70), and the output end of the control unit (70) is electrically connected to the control ends of the frequency conversion unit (40) and the switch unit (50), respectively.

2. The motor soft start energy-saving control protection device according to claim 1 is characterized in that: The motor soft-start energy-saving control and protection device further comprises a temperature detection unit (90), the temperature detection unit (90) is used to detect the temperature of the motor (80), and the output end of the temperature detection unit (90) is electrically connected to the input end of the control unit (70).

3. The motor soft start energy-saving control protection device according to claim 2 is characterized in that: The temperature detection unit (90) is a temperature sensor.

4. The motor soft-start energy-saving control protection device according to claim 3 is characterized in that: The motor soft-start energy-saving control and protection device further comprises a communication unit (100), and the communication unit (100) is electrically connected to the control unit (70).

5. The motor soft-start energy-saving control protection device according to claim 4 is characterized in that: The communication unit (100) is an Ethernet communication module.

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