CN203574467U - Non-salient pole synchronous motor rotor end portion ventilation unit - Google Patents

Abstract

The utility model relates to a ventilation device for the rotor end of a hidden pole synchronous motor. The unit capacity of synchronous motors continues to increase, which makes the local temperature rise of the unit relatively high, and the thermal stress and thermal deformation are relatively large. The utility model consists of: a rotor (15), the rotor is axially symmetrical, 24 slots are opened on the cross-section of the rotor, and there are fan-shaped slots between the end arc sections ( 9 ) of the slots An insulating stopper ( 5 ), with a transverse stopper ( 4 ) between the end straight sections (8) of the long winding slot , and an air inlet (6) is opened at the position where the end arc section is close to the pole center line, A supplementary air outlet (2) is provided at the end straight section of the long winding slot near the entrance of the auxiliary slot, and a ventilation device combining internal and external air cooling in the end arc section is used to adjust the amount of incoming air. The utility model is used in the field of R&D and manufacture of hidden pole synchronous motors.

Description

Ventilation device at the end of the rotor of the hidden pole synchronous motor

Technical field:

The utility model relates to a ventilation device for the rotor end of a hidden pole synchronous motor.

Background technique:

1. End Cooling Technology of Secluded Pole Synchronous Motor

With the development of the national economy, the demand for electric power is increasing day by day. As a high-power transmission equipment, the synchronous motor has an increasing capacity.

The continuous increase of stand-alone capacity is mainly realized by increasing the electromagnetic load. However, increasing the electromagnetic load also increases the copper loss of the wire rod, which makes the local temperature rise of the unit relatively high, and the thermal stress and thermal deformation are relatively large. Therefore, a reasonable cooling method is adopted. It is the key to ensure the continuous improvement of the motor stand-alone capacity.

As the synchronous motor cooling system, the air cooling system has the simplest equipment, easy maintenance, good safety, and high overall economic benefits, so the use of air cooling has become one of the current development trends of electric motors. Compared with other cooling media, air has lower thermal conductivity, lower heat capacity, higher density, and greater wind mill loss; Larger; when the temperature rises to a certain level, it will first endanger the safety of insulating materials, and then endanger the safety of metal structural parts, and the motor will not be able to run safely.

At present, the key technology encountered in the large-scale process of various air-cooled motors is the cooling problem under complex structures. Reasonable ventilation methods, reasonable distribution of flow, and enhanced cooling of windings at high temperatures can ensure the service life and safety of the motor. Reliable operation. At home and abroad, accidents that endanger the safe operation of the motor due to the short circuit between the turns of the rotor winding and the serious deformation of the structure caused by the heating of the motor components occur from time to time.

2. Significance of Ventilation at the Rotor End of Secrecy-pole Synchronous Motor

There are many kinds of ventilation systems commonly used for air-cooled hidden-pole synchronous motors. Part of the air in this device enters the cooling air duct inside the rotor from the air inlet at the end of the rotor close to the center line of the pole. It flows out from the air outlet of the slot wedge on the surface of the rotor. For slots with longer winding lengths, an air replenishment port is opened at the end straight section near the entrance of the auxiliary slot. . In addition, part of the air flows through the external cooling air channel formed by the block to cool the rotor end winding, further reducing the temperature of the rotor winding and ensuring the safe and stable operation of the motor.

Therefore, it has important practical significance and good application prospect to develop and develop the ventilation device at the end of the rotor of the hidden pole synchronous motor.

Invention content:

The purpose of the utility model is to provide a ventilation device for the rotor end of a hidden pole synchronous motor.

The purpose of this utility model is achieved in that:

A ventilation device for the rotor end of a secluded pole synchronous motor, which consists of: a rotor, the rotor is axially symmetrical, 24 slots are opened on the cross section of the rotor, and the arc section at the end of the slot is There is a fan-shaped insulating stopper between them, and there is a transverse stopper between the end straight sections of the long winding slot. A supplementary air outlet is set up near the entrance of the auxiliary tank.

For the ventilation device at the rotor end of the hidden pole synchronous motor, the 24 slots are divided into four groups, namely, slot group one, slot group two, slot group three, and slot group four; the slot group one, slot group There is a transverse stopper between the second group, a transverse stopper between the second and third groove groups, and a transverse stopper between the third and fourth groove groups.

As for the ventilation device at the rotor end of the hidden pole synchronous motor, the slot group one of the 24 slots has long winding slots, including: slot three, slot four, slot five, and slot six; the slot group two, the slot group There are also long winding slots in the third slot group and the fourth slot group, and the positions of the long winding slots correspond to the long winding slots in the first slot group.

As for the ventilation device at the rotor end of the hidden pole synchronous motor, the distance from the position of the air inlet hole at the end arc of slot 1 to the center line of the pole is about half of the total length of the arc, and the opening positions of other slots are the same as their pole angles.

As for the ventilation device at the end of the rotor of the secluded pole synchronous motor, the size of the supplementary air inlet near the entrance of the auxiliary slot in the straight section of the end is the same as the size of the air inlet in the arc section of the end.

至45

度之间。 As for the ventilation device at the rotor end of the secluded pole synchronous motor, the included angle β between the air inlet of the end arc section and the flow direction of the air entering the end straight section is 30

to 45

between degrees.

As for the ventilation device at the rotor end of the hidden pole synchronous motor, the distance d between the air inlet hole in the end arc section and the turning point of the end arc section is greater than zero, and d does not exceed the total length of one arc section of the slot. 1/3 of the length.

Beneficial effect:

1. There are many kinds of ventilation systems commonly used for air-cooled hidden pole synchronous motors. Part of the air enters the cooling air duct inside the rotor from the air inlet at the end of the rotor close to the center line of the pole. After cooling the end winding, it enters with the air from the auxiliary slot It flows out from the air outlet of the slot wedge on the surface of the rotor. For slots with longer winding lengths, an air replenishment port is opened at the end straight section near the entrance of the auxiliary slot. . In addition, part of the air flows through the external cooling air channel formed by the block to cool the rotor end winding, further reducing the temperature of the rotor winding and ensuring the safe and stable operation of the motor.

Description of drawings:

Accompanying drawing 1 is the plan view of opening position of the air inlet hole at the end arc section of the No. 1-6 slot end of the hidden pole synchronous motor rotor and the air supply port at the straight section of the No. 3-6 end part.

Accompanying drawing 2 is the plan view of the structure dimension of the end arc section and the end straight section of the slot one of the rotor slot of the hidden pole synchronous motor.

Accompanying drawing 3 is the structural distribution diagram of the slot on the rotor section.

Detailed ways:

Example 1:

A ventilation device for the rotor end of a secluded pole synchronous motor, which consists of: a rotor 15, the rotor is axially symmetrical, 24 slots are opened on the cross section of the rotor, and the arc section at the end of the slot is There is a fan-shaped insulation stopper 5 between the 9 parts, and a transverse stopper 4 is provided between the end straight sections 8 of the long winding slot, and an air inlet 6 is opened at the position of the end arc section close to the pole center line, and the long winding slot The end straight section of the winding slot is close to the entrance of the auxiliary slot to set up the air supply port 2, and the ventilation device combining the air at the end arc section with internal and external cooling is adopted to adjust the amount of air entering.

Example 2:

According to the ventilation device for the rotor end of the hidden pole synchronous motor described in Embodiment 1, the 24 slots are divided into four groups, namely, slot group one 16, slot group two 17, slot group three 18, and slot group four 19; There is a transverse block between the groove six of the groove group one (item number 7 in the figure) and the groove seven of the groove group two (item number 3 in the figure), and between the groove group two and the groove group three There is also a transverse stopper, and there is also a transverse stopper between said groove group three and groove group four.

Example 3:

According to the ventilation device for the rotor end of a secluded pole synchronous motor described in Embodiment 1, the long winding slots include: slot group one, the middle and long winding slots include: slot three (item 11), slot four (item 12), slot five (piece 13), said slot six (piece 14), said slot group two, said slot group three, and said slot group four also have long winding slots, the position of said long winding slots is the same as said Corresponds to the long winding described in the first slot set.

Example 4:

According to the ventilation device for the rotor end of the hidden pole synchronous motor described in Embodiment 1, the distance from the position of the air inlet hole in the arc section of the slot end of the slot 1 to the center line of the pole is about half of the total length of the arc section, and the opening positions of other slots same as its polar angle.

Example 5:

According to the ventilation device at the end of the rotor of the hidden-pole synchronous motor described in Embodiment 1, the size of the air supply port near the entrance of the auxiliary slot in the straight section of the end is the same as the size of the air inlet in the arc section of the end. same.

Embodiment 6:

至45

度之间。 According to the ventilator at the end of the rotor of the secluded pole synchronous motor described in Embodiment 1, the angle β between the air inlet of the end arc section and the flow direction of the air entering the end straight section is 30

to 45

between degrees.

Embodiment 7:

According to the rotor end ventilation device of the hidden pole synchronous motor described in Embodiment 1, the distance d between the air inlet hole in the end arc section and the turning point of the end arc section is greater than zero, and d cannot be opened at At the turning point at the junction of the straight section and the arc section, the larger the value of d will lead to the increase of air volume loss, and d shall not exceed 1/3 of the total length of the first arc section of the slot.

Claims (7)

1. A ventilation device for the rotor end of a hidden pole synchronous motor, which consists of: a rotor, characterized in that: the rotor is axially symmetrical, and 24 slots are provided on the cross section of the rotor, and in the slots There is a fan-shaped insulating stopper between the end arc sections of the long winding slot, and a transverse stopper is provided between the end straight sections of the long winding slot. An air inlet is set at the position of the end arc section close to the center line of the pole. The straight section at the end of the winding slot is provided with a supplementary air port close to the entrance of the auxiliary slot. 2. The ventilation device for the rotor end of a hidden pole synchronous motor according to claim 1, wherein the 24 slots are divided into four groups, namely, slot group one, slot group two, slot group three, and slot group 4. There is a transverse stopper between the first and second groove groups, there is a transverse stopper between the second and third groove groups, and between the third and fourth groove groups There are lateral stops. 3. According to claim 1 or 2, the rotor end ventilation device of a secluded pole synchronous motor is characterized in that: said slot group one has long winding slots, including: slot three, slot four, slot five, and slot six There are also long winding slots in the second slot group, the third slot group and the fourth slot group, and the positions of the long winding slots correspond to the long winding slots in the first slot group. 4. The rotor end ventilation device of a secluded pole synchronous motor according to claim 1 or 2, characterized in that: the distance from the position of the air inlet hole in the end arc section of the slot 1 to the center line of the pole is about 10% of the total length of the arc section Half of the other groove opening positions are the same as their polar angles. 5. The rotor end ventilation device of a secluded pole synchronous motor according to claim 1 or 2, characterized in that: the size of the air supply port near the entrance of the auxiliary tank at the straight section of the end is the same as that of the end The air inlets described in the arcs are of the same size. 6. The rotor end ventilation device of a secluded pole synchronous motor according to claim 1 or 2, characterized in that: the flow of air entering the air inlet described in the arc section of the end and the straight section of the end The angle β between the directions is 30

to 45

between degrees. 7. The rotor end ventilation device of a secluded pole synchronous motor according to claim 1 or 2, characterized in that: the distance from the air inlet hole in the end arc section to the turning point of the end arc section d is greater than zero, and d does not exceed 1/3 of the total length of slot one arc.

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