CN204408102U - Permagnetic synchronous motor and include the helical-lobe compressor of this permagnetic synchronous motor - Google Patents

Abstract

Permagnetic synchronous motor and include the helical-lobe compressor of this permagnetic synchronous motor, belongs to motor radiating technical field.Comprise motor casing, motor rear cover, motor stator, rotor and motor shaft, motor rear cover is arranged on the end, one end of motor casing length direction, fix with the inwall of motor casing in the die cavity that motor stator is placed in motor casing, rotor is sleeved on motor shaft, maintain gap between the two in the die cavity that this rotor is placed in motor stator, feature: rotor is provided with one without spiral case centrifugal fan on the side away from motor rear cover side, this to be placed in the other end end of motor casing length direction without spiral case centrifugal fan and can to follow rotor coaxial rotation.Also comprise a kind of helical-lobe compressor driven by above-mentioned permagnetic synchronous motor.Advantage: compact conformation, cooling effect of motor are good, can reduce pneumatic noise and the fan power consumption of motor simultaneously, makes compressor operating more steady, long service life.

Description

Permanent magnet synchronous motor and screw compressor including the permanent magnet synchronous motor

technical field

The utility model belongs to the technical field of motor cooling, in particular relates to a permanent magnet synchronous motor, and also relates to a screw compressor including the permanent magnet synchronous motor.

Background technique

The permanent magnet synchronous motor has the characteristics of small size, high overall operating efficiency, high power factor, large starting torque, good force index, and low temperature rise, so it has been used in the drive of compressors in recent years. Compared with the traditional motor, the permanent magnet synchronous motor adopts the permanent magnet in the motor rotor for excitation, which can avoid the excitation loss caused by the magnetic field generated by the excitation current. The disadvantage is that it is necessary to take forced heat dissipation measures to take away the heat inside the permanent magnet synchronous motor To avoid the demagnetization of permanent magnets caused by long-term high temperature working environment. Existing permanent magnet synchronous motors generally use forced blown air cooling for heat dissipation, and the cooling fan on the motor rotor is the same as the traditional motor, using a straight blade centrifugal fan. Its working principle is: when the motor is working, the centrifugal fan throws the airflow out of the blades, and after the thrown out airflow passes through the coil winding at the end of the stator and other structures with sudden changes in the airflow direction, the hot air is discharged from the other side of the motor. For permanent magnet synchronous motors, when the motor is working with frequency conversion, especially when it is running at high frequency, there are relatively prominent problems such as large noise generated by the airflow and high power consumption. The cooling structure is improved.

Contents of the invention

The primary task of the utility model is to provide a permanent magnet synchronous motor with compact structure and good motor cooling effect, which can reduce the airflow noise of the motor and the power consumption of the fan.

Another task of the present utility model is to provide a screw compressor, which can fully reflect the technical effect of the permanent magnet synchronous motor, and make the compressor work more stably and have a longer service life.

In order to complete the primary task, the technical solution provided by the utility model is: a permanent magnet synchronous motor, including a motor casing, a motor back cover, a motor stator, a motor rotor and a motor shaft, and the motor back cover is installed on the motor One end in the length direction of the shell, the motor stator is placed in the cavity of the motor shell and fixed to the inner wall of the motor shell, the motor rotor is sleeved on the motor shaft, and the motor rotor is placed on the motor stator There is a gap in the cavity and there is a gap between the two. It is characterized in that: the motor rotor is equipped with a volute-free centrifugal fan on the side away from the motor rear cover, and the volute-free centrifugal fan is placed in the motor. The other end in the length direction of the shell can rotate coaxially with the rotor of the motor.

In a specific embodiment of the present utility model, the inner wall of the motor casing is provided with an airflow channel at intervals.

In another specific embodiment of the present utility model, an air inlet is opened on the rear cover of the motor.

In yet another specific embodiment of the present utility model, a through hole is opened on the rear cover of the motor, the diameter of the through hole is larger than the diameter of the outer circle of the rotor of the motor at the maximum point, and the through hole is installed There is a ventilating plate of the back cover, and an air inlet is opened on the ventilating plate of the rear cover.

In order to complete another task, the technical solution provided by the utility model is: a screw compressor, including a screw compressor host, the screw compressor host includes a screw rotor and rotor shafts arranged at both ends of the screw rotor in the length direction, It is characterized in that it also includes the permanent magnet synchronous motor described above for driving the main engine of the screw compressor, the motor shaft of the permanent magnet synchronous motor is connected with the rotor shaft through a coupling, or the motor shaft It is formed by extending directly from the rotor axial direction of the cavity of the motor casing.

After adopting the above structure, the utility model has beneficial effects: the problem of uneven cooling flow field of the permanent magnet synchronous motor is solved by using the heat dissipation effect of the volute-free centrifugal fan, and the structure is compact, the cooling effect of the motor is good, and at the same time it can reduce the The airflow noise of the motor and the power consumption of the fan make the compressor work more smoothly and have a longer service life.

Description of drawings

Fig. 1 is a schematic structural view of the permanent magnet synchronous motor described in the present invention.

Fig. 2 is a schematic diagram of the cooling air flow of the permanent magnet synchronous motor described in the present invention.

Fig. 3 is a perspective view of the installation of the volute-less centrifugal fan and the motor rotor of the present invention.

FIG. 4 is a perspective view of the embodiment of FIG. 3 in another direction.

Fig. 5 is a structural schematic diagram of a screw compressor including a permanent magnet synchronous motor according to the present invention.

In the figure: 1. Motor casing; 2. Motor back cover; 3. Back cover ventilation plate; 4. Motor stator; 5. Centrifugal fan without volute; 6. Screw; 7. Motor rotor; 8. Fixed plate; 9 . Fixing bolts; 10. Motor shaft; 11. Screw rotor; 12. Rotor shaft.

Detailed ways

In order to enable the public to fully understand the technical essence and beneficial effects of the present utility model, the applicant will describe the specific implementation of the present utility model in detail below in conjunction with the accompanying drawings, but the applicant's description of the embodiments is not a limitation to the technical solution, any Changes made in form but not in substance according to the concept of the utility model should be regarded as the protection scope of the utility model.

Please refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the utility model relates to a permanent magnet synchronous motor, which includes a motor casing 1, a motor back cover 2, a motor stator 4, a motor rotor 7 and a motor shaft 10, the The motor stator 4 described above is placed in the cavity of the motor housing 1 and fixed to the inner wall of the motor housing 1 , and the inner wall of the motor housing 1 is provided with an air flow channel at intervals. The motor rear cover 2 is installed at one end of the motor housing 1 in the length direction, and an air inlet for sucking outside air into the motor is provided on the motor rear cover 2; or a through hole is provided on the motor rear cover 2 , the diameter of the through hole is greater than the diameter of the outer circle of the motor rotor 7 at the maximum point, the through hole can facilitate the motor rotor 7 to be loaded into the cavity of the motor stator 4, and a protective device is installed in the through hole The ventilating panel 3 of the rear cover, on the ventilating panel 3 of the rear cover, is provided with the air inlet that sucks the outside air into the motor, preferably in this embodiment: the technology of installing the ventilating panel 3 of the rear cover 2 on the motor plan. The motor rotor 7 is set on the motor shaft 10, and the motor shaft 10 is connected with the input shaft of the corresponding main machine driven by the motor through a coupling, or the input shaft of the corresponding main machine extends from the cavity of the motor housing 2 In this embodiment, the motor shaft 10 is preferably the latter. A fixed plate 8 is pressed against the motor rotor 7 at the end of the motor shaft 10, and the fixed bolt 9 is screwed into the motor shaft 10 through the through hole on the fixed plate 8, thereby realizing the axial fixation of the motor rotor 7. The motor rotor 7 is placed in the cavity of the motor stator 4 with a gap between them. The motor rotor 7 is provided with a volute-free centrifugal fan 5 on the side away from the motor rear cover 2. The volute-free centrifugal fan 5 is placed in the other end of the motor casing 1 in the length direction and can follow the motor. The rotor 7 rotates coaxially.

Please continue to refer to Fig. 2, Fig. 3 and Fig. 4, describe the operating principle of the present utility model:

While the permanent magnet synchronous motor is working, the motor rotor 7 drives the volute-free centrifugal fan 5 to work, and the volute-free centrifugal fan 5 can suck the cooling air from the outside into the motor from the air inlet of the back cover ventilating plate 3 . As shown in the direction of the arrow in Figure 2, the inhaled low-temperature air flows in two ways: one way flows along the gap between the motor rotor 7 and the motor stator 4, and the other way flows along the gap between the motor stator 4 and the motor casing 1 The airflow channel flows. The two cooling air flow modes can better cool the motor rotor 7 and the motor stator 4, ensure long-term high-efficiency operation of the permanent magnet synchronous motor, and avoid demagnetization of the permanent magnet caused by long-term high-temperature working environment. Finally, the heat-absorbed air is thrown out of the motor housing 1 in the radial direction by the volute-less centrifugal fan 5 . Compared with the traditional forced air blowing method, this cooling air flow method has the characteristics of more uniform flow field distribution and stable gas flow, thereby reducing the airflow noise of the motor and reducing the power consumption of the cooling fan.

Please continue to refer to FIG. 5 , a screw compressor includes a screw compressor main body, and the screw compressor main body includes a screw rotor 11 and rotor shafts 12 arranged at both ends of the screw rotor 11 in the length direction, and also includes a screw compressor for driving the screw compressor. The above-mentioned permanent magnet synchronous motor that the machine host works, the motor shaft 10 of the permanent magnet synchronous motor is connected to the rotor shaft 12 through a coupling, or the motor shaft 10 is directly connected to the motor by the rotor shaft 12 The cavity of the shell 2 is extended. In this embodiment, the motor shaft 10 is preferably extended directly from the rotor shaft 12 to the cavity of the motor shell 2, so that the permanent magnet synchronous motor drives the screw compressor to work. . When the screw compressor installed with the permanent magnet synchronous motor works, the permanent magnet synchronous motor has a good cooling effect, and at the same time reduces the airflow noise of the motor and the power consumption of the fan, and the compressor works more stably.

Claims (5)

1. a permanent magnet synchronous motor, comprising a motor casing (1), a motor back cover (2), a motor stator (4), a motor rotor (7) and a motor shaft (10), and the described motor back cover (2 ) is installed at one end of the motor housing (1) in the length direction, and the motor stator (4) is placed in the cavity of the motor housing (1) and fixed to the inner wall of the motor housing (1). The motor rotor (7) is sleeved on the motor shaft (10), the motor rotor (7) is placed in the cavity of the motor stator (4) and there is a gap between the two, it is characterized in that: the motor The rotor (7) is equipped with a volute-free centrifugal fan (5) on the side away from the motor rear cover (2), and the volute-free centrifugal fan (5) is placed at the other end of the motor casing (1) in the length direction It is inside the end and can rotate coaxially with the rotor (7) of the motor. 2. The permanent magnet synchronous motor according to claim 1, characterized in that the inner wall of the motor housing (1) is spaced apart with airflow passages. 3. The permanent magnet synchronous motor according to claim 1, characterized in that an air inlet is opened on the rear cover (2) of the motor. 4. The permanent magnet synchronous motor according to claim 1, characterized in that the motor rear cover (2) is provided with a through hole, and the diameter of the through hole is larger than the outer circle of the motor rotor (7) at the maximum The diameter of place, and a back cover air-permeable plate (3) is installed in the through hole, offers air inlet on the described back cover air-permeable plate (3). 5. A screw compressor, comprising a screw compressor main frame, said screw compressor main frame comprising a screw rotor (11) and rotor shafts (12) arranged at both ends of the screw rotor (11) in the lengthwise direction, characterized in that: Comprising the permanent magnet synchronous motor described in any one of the above claims 1 to 4 for driving the main engine of the screw compressor, the motor shaft (10) of the permanent magnet synchronous motor passes through the rotor shaft (12) The coupling is connected, or the motor shaft (10) is directly extended from the rotor shaft (12) to the cavity of the motor casing (2) .