Alternating current motor with thermoelectric power generation device

Abstract

An alternating-current motor with a thermoelectric power generation device relates to the technical field of motors, and comprises a cooling fan, a three-phase winding and a three-phase alternating-current power supply, first leading-out ends of the three-phase winding are connected, second leading-out ends of the three-phase winding are respectively connected with the three-phase alternating-current power supply, and the three-phase alternating-current power supply is connected with the cooling fan. The system is characterized by further comprising a thermoelectric power generation device and a DC / AC electric energy conversion device, the DC / AC electric energy conversion device is arranged on a rear end cover of the motor, the output end of the DC / AC electric energy conversion device is connected with the second leading-out end of each phase winding, and the input end of the DC / AC electric energy conversion device is connected with the thermoelectric power generation device; the thermoelectric power generation device is in a circular ring shape formed by jointing a plurality of fan-shaped thermoelectric power generation units, a groove is formed in the thermoelectric power generation device, the three-phase winding is partially clamped into the groove, and the thermoelectric power generation units are connected in series. The alternating-current motor with the thermoelectric power generation device can improve the working efficiency of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to the technology of an AC motor with a temperature difference power generation device. Background Art

[0002] When AC motors convert electrical energy into mechanical energy, they inevitably generate heat losses in the windings, cores, and mechanical rotating parts. Heat losses can cause the temperature inside the motor to rise, leading to damage to the insulation system and reducing the life of the motor. Therefore, measures need to be taken to cool the motor.

[0003] Existing motors have a variety of cooling technologies, such as self-cooling, fan internal cooling, and water cooling. Among them, the most common is to install a cooling fan on the motor shaft. When the motor is running, it circulates to inhale cold air, expel hot air and take away the heat loss of the motor. The cooling device will occupy the internal space of the motor, and the cooling device itself needs to consume energy to keep running, which reduces the operating efficiency of the motor.

[0004] Thermoelectric power generation technology uses the temperature difference between the two ends of two conductors or semiconductor materials to generate electromotive force to directly generate electricity. Chinese patent CN108599621A discloses a liquid-cooled hub motor cooling thermoelectric power generation device and its working method. The device includes a hub motor, an oil storage tank, an oil pump, an oil guide pipe, a thermoelectric power generation device and other accessories. The hub motor uses a coolant spray and a circulating oil circuit in the motor housing to dissipate heat and cool down. The oil storage tank shell serves as the thermoelectric power generation hot end, and the metal plate in contact with the external cold air serves as the cold end. The device can reduce the operating temperature of the hub motor, improve the motor's operating performance and life, and can also recover the heat emitted by the hub motor to improve the energy utilization efficiency of the hub motor. However, the thermoelectric power generation device of the device is far away from the heat source, and its power generation efficiency is poor.

[0005] Chinese patent CN211830480U discloses a motor assembly including a thermoelectric generator, which generates electricity through the temperature difference between the hot end and the cold end of the thermoelectric generator, thereby improving energy utilization and reducing the heat generated by the stator winding. However, the thermoelectric generator needs to occupy the stator slot of the motor, which reduces the utilization rate of the stator slot. Utility Model Content

[0006] In view of the defects existing in the above-mentioned prior art, the technical problem to be solved by the present utility model is to provide an AC motor with a temperature difference power generation device which can improve efficiency, increase capacity and reduce temperature rise under the condition of the same motor volume.

[0007] In order to solve the above technical problems, the utility model provides an AC motor with a temperature difference power generation device, comprising a cooling fan, a three-phase winding and a three-phase AC power supply, wherein the first lead ends of the three-phase winding are connected, and the second lead ends of the three-phase winding are respectively connected to the three-phase AC power supply, and the utility model is characterized in that: it also includes a temperature difference power generation device and a DC / AC power conversion device;

[0008] The DC / AC power conversion device is arranged on the rear end cover of the motor, the output end of the DC / AC power conversion device is connected to the second lead end of each phase winding, and the input end is connected to the temperature difference power generation device;

[0009] The temperature difference power generation device is composed of multiple fan-shaped temperature difference power generation units connected into a circular ring shape. A groove is opened on the device, and the three-phase winding is partially inserted into the groove. The left side of the temperature difference power generation device is fixedly connected to the three-phase winding and the stator core by thermal conductive glue, and the right side is fixedly connected to the end cover of the motor by thermal conductive glue. Each temperature difference power generation unit is connected in series.

[0010] The cooling fan is sleeved on the rotating shaft of the motor and rotates synchronously with the rotating shaft. The fan is located between the wind cover and the rear end cover of the motor. The inner side wall of the motor housing is provided with ventilation grooves spaced apart along the circumferential direction.

[0011] Furthermore, the wind shield is provided with meshes.

[0012] The AC motor with a temperature difference power generation device provided by the utility model adopts a motor structure with a built-in temperature difference power generation device. When the motor is working, the temperature difference between the winding and the end cover is used to generate electricity to form energy recovery, which can improve the working efficiency of the motor. Compared with the prior art, while maintaining the same efficiency, the utility model can select a cooling fan with smaller power and volume, thereby reducing the size of the motor. When using a cooling fan of the same power, since the utility model has a higher efficiency, the temperature rise of the utility model is lower and the capacity is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural axial half-section view of an AC motor with a temperature difference power generation device according to an embodiment of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of a temperature difference power generation unit according to an embodiment of the utility model;

[0015] Figure 3 It is a radial half-section view of the casing of the AC motor with the temperature difference power generation device according to the embodiment of the utility model;

[0016] Figure 4 The utility model is a circuit wiring diagram of an AC motor with a temperature difference power generation device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0017] The following is a further detailed description of an embodiment of the utility model in conjunction with the accompanying drawings, but the embodiment is not intended to limit the utility model. All similar structures and similar changes of the utility model should be included in the protection scope of the utility model. The semicolons in the utility model all represent the relationship of and.

[0018] like Figure 1-Figure 3 As shown, an AC motor with a temperature difference power generation device provided by an embodiment of the utility model includes a cooling fan 11, a three-phase winding X (Xa, Xb, Xc) and a three-phase AC power supply U1, the first lead ends of the three-phase windings are connected, and the second lead ends of the three-phase windings are respectively connected to the three-phase AC power supply U1, characterized in that: it also includes a temperature difference power generation device U2 and a DC / AC power conversion device 2;

[0019] The DC / AC power conversion device 2 is arranged on the rear end cover of the motor, the output end of the DC / AC power conversion device 2 is connected to the second lead end of the three-phase winding, and the input end is connected to the temperature difference power generation device U2;

[0020] The temperature difference power generation device U2 is composed of a plurality of fan-shaped temperature difference power generation units connected into a circular ring shape. A groove 152 is provided on the device, and the three-phase winding X is partially inserted into the groove. The left side of the temperature difference power generation device U2 is fixedly connected to the three-phase winding X and the stator core by thermal conductive glue, and the right side is fixedly connected to the end cover of the motor by thermal conductive glue. Each temperature difference power generation unit is connected in series.

[0021] The cooling fan 11 is sleeved on the rotating shaft 12 of the motor and rotates synchronously with the rotating shaft 12. The fan is located between the wind cover 13 and the rear end cover 14 of the motor. The inner wall of the motor housing 15 is provided with ventilation grooves 151 spaced apart along the circumferential direction.

[0022] In the embodiment of the utility model, the ventilation groove 151 is semicircular, and the wind cover 13 is mesh-shaped.

[0023] The working principle of the embodiment of the utility model is as follows:

[0024] When the motor is running, a hot end is formed at the left end of the temperature difference power generation device due to the copper loss and iron loss generated by the three-phase winding X and the stator core; the cooling fan 11 on the shaft rotates with the shaft 12, and the fan blades inhale cooling air from the wind cover 13, and discharge it outward after passing through the side wall of the rear end cover 14 and the ventilation groove 151 on the inner wall of the casing 15, while taking away part of the heat loss of the motor, and the rear end cover cooled by air forms the cold end of the temperature difference power generation device.

[0025] The copper loss and iron loss generated by the three-phase winding X and the stator core account for about 90% of the total motor loss, of which the copper loss of the three-phase winding X accounts for about 60%. Since the copper material used in the winding is easy to conduct heat, the main heat dissipation path is concentrated at the end of the winding. At the same time, the cooling air path significantly reduces the temperature of the rear end cover 14. The temperature difference between the cold end and the hot end of the temperature difference power generation device U2 is large, forming a temperature difference electromotive force, so that the temperature difference power generation device is in a power generation state.

[0026] like Figure 4 As shown, the direct current generated by the temperature difference power generation device is converted into alternating current through the DC / AC power conversion device. At the same time, when it is detected that the output alternating current has the same amplitude, phase and phase sequence as the input three-phase alternating current power supply, it is connected in parallel to the three-phase winding circuit of the motor.

Claims

1. An AC motor with a temperature difference power generation device, comprising a cooling fan, a three-phase winding and a three-phase AC power supply, wherein the first lead ends of the three-phase winding are connected, and the second lead ends of the three-phase winding are respectively connected to the three-phase AC power supply, characterized in that: It also includes a temperature difference power generation device and a DC / AC power conversion device; The DC / AC power conversion device is arranged on the rear end cover of the motor, the output end of the DC / AC power conversion device is connected to the second lead end of each phase winding, and the input end is connected to the temperature difference power generation device; The temperature difference power generation device is formed of a plurality of fan-shaped temperature difference power generation units connected into a ring shape. A groove is provided on the device, and a three-phase winding is partially inserted into the groove. The left side of the temperature difference power generation device is fixedly connected to the three-phase winding and the stator core by a thermal conductive adhesive, and the right side is fixedly connected to the end cover of the motor by a thermal conductive adhesive. Each temperature difference power generation unit is connected in series. The cooling fan is sleeved on the rotating shaft of the motor and rotates synchronously with the rotating shaft. The fan is located between the wind cover and the rear end cover of the motor. The inner side wall of the motor housing is provided with ventilation grooves spaced apart along the circumferential direction.

2. The AC motor with a temperature difference power generation device according to claim 1, characterized in that: The wind shield is provided with meshes.

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