CN101359862B - Permanent magnetic synchronous motor having single electricity port and dual mechanical port of same speed in reversed direction - Google Patents

Abstract

A permanent magnet synchronous motor with a single electric port and reverse dual mechanical ports at the same speed, relates to a motor used in a counter-rotating propeller propulsion system of an underwater vehicle, the solid shaft and the hollow shaft of the permanent magnet synchronous motor are concentric, and the solid shaft The left end is equipped with inner shaft front bearing, stator front end cover, outer shaft front bearing, hollow shaft, casing bearing, casing bearing front end cover in sequence from inside to outside. Function, the left end of the connector is fixed on the front end cover of the stator, and the right end is fixed on the rear end cover of the stator. The beneficial effects of the present invention are: the two inner and outer rotors are used to directly drive the counter-rotating propellers (blade inclination angles are opposite), which can make the two propellers generate propulsion while canceling out the rotational moment generated in the circumferential direction, thus effectively avoiding The rolling phenomenon of the underwater vehicle is eliminated, the forward attitude of the vehicle is guaranteed, and the operating efficiency of the system is improved.

Description

Permanent magnet synchronous motor with single electrical port and same-speed reverse dual mechanical port

technical field

The invention relates to a motor used in a counter-rotating propeller propulsion system of an underwater vehicle, in particular to a permanent magnet synchronous motor with a single electric port and double mechanical ports at the same speed and reverse direction.

Background technique

At present, the known contra-rotating propeller propulsion motors of underwater vehicles are dual-rotor DC motors, which require two sets of brushes and slip ring structures, which reduces the reliability of the motor and increases the mechanical volume, weight, maintenance difficulty and cost. .

Contents of the invention

In order to overcome the shortcomings of the existing dual-rotor DC motor as the propulsion motor of the underwater vehicle, the present invention provides a permanent magnet synchronous motor with a single electrical port and a same-speed reverse dual mechanical port, which eliminates the need for brushes and The slip ring device realizes brushless while ensuring the output of the same speed and different rotation torque, and improves the overall performance of the propulsion system of the underwater vehicle.

The present invention proposes a permanent magnet synchronous motor with a single electrical port and dual mechanical ports at the same speed. The single electrical port means that the frequency converter only supplies power to one set of windings, while the dual mechanical ports allow the two rotors of the motor to independently output mechanical power.

The present invention adopts the following technical scheme: the permanent magnet synchronous motor includes a stator, an inner permanent magnet rotor, an outer permanent magnet rotor, a hollow shaft, a solid shaft, a stator front end cover, a stator rear end cover, an outer rotor rear end cover, and a casing front end cover , Housing rear cover, bearings, front bearing cover, housing and external wiring holes, etc. The solid shaft and the hollow shaft are concentric, the left end of the solid shaft is sequentially assembled with the inner shaft front bearing, the stator front end cover, the outer shaft front bearing, the hollow shaft, the casing bearing, the casing bearing front end cover, and the right end of the solid shaft is from the inside to the outside. The rear bearing of the inner shaft, the rear end cover of the stator, the rear bearing of the outer shaft, the rear end cover of the outer rotor, and the rear end cover of the casing are assembled in sequence, and the inner permanent magnet rotor, stator, outer Permanent magnet rotor and housing. The inner permanent magnet rotor is fixed on the solid shaft, and there is a connecting piece in the middle of the stator, which plays the role of tightening the stator silicon steel sheet. The left end of the connecting piece is fixed on the front end cover of the stator, and the right end is fixed on the rear end cover of the stator. The rear end cover of the stator is provided with an external wiring hole close to the bearing, through which the frequency converter supplies power directly to the internal stator winding, the left end of the outer permanent magnet rotor is connected to the hollow shaft, the right end is connected to the rear end cover of the outer rotating shaft, the stator and the outer permanent magnet Because the rotor is fixed at both ends, the mechanical stability of the motor is enhanced during operation.

The inner circular wall and the outer circular wall of the stator of the motor are evenly slotted, and the single-feed annular cross stator winding is embedded, and any two-phase windings in the windings embedded in the inner slot and outer slot of the stator are selected, and the single-feed annular cross The stator winding is wound from the outer circular wall slot through the end of the stator to the inner circular wall slot, and a single-feed ring cross stator winding is formed at the cross exchange position of the stator end. Radial grooves are evenly opened on the inner and outer circumferences, and single-feed ring-type cross-type three-phase stator windings are embedded. Compared with the traditional winding, the end of the ring winding is shorter, especially for motors with a small number of poles and a large radius, which improves the utilization rate of the winding, reduces the leakage reactance of the end, and improves the performance of the entire motor. Select any two-phase windings in the windings embedded in the inner slot and outer slot of the stator, and exchange their positions at the end of the stator, so that the phase sequence of the inner winding and the outer winding is opposite. The inner air gap and the outer air gap respectively generate a reverse rotating magnetic field at the same speed, thereby driving the rotor to rotate in reverse, and because the number of poles of the windings on both sides of the stator of the motor is the same, the rotation speed of the magnetic field in the inner air gap and the outer air gap of the stator is the same and the direction is opposite, so The inner permanent magnet rotor and the outer permanent magnet rotor rotate at the same speed and in opposite directions, and the mechanical power output by the two rotors may also be different. The inner and outer rotors adopt a permanent magnet surface-mounted (or plug-in) structure, and the mechanical output of the two rotors adopts a single-end concentric double-shaft structure.

The beneficial effects of the present invention are: the two inner and outer rotors are used to directly drive the counter-rotating propellers (blade inclination angles are opposite), which can make the two propellers generate propulsion while canceling out the rotational moment generated in the circumferential direction, thus effectively avoiding The rolling phenomenon of the underwater vehicle is eliminated, the forward attitude of the vehicle is guaranteed, and the operating efficiency of the system is improved. It realizes the brushless dual-rotor motor used in the propulsion system of the underwater vehicle contra-rotating propeller, simplifies the mechanical structure of the dual-rotor DC motor used in this field, and improves the reliability of operation. When fed into a group of three-phase symmetrical The alternating current can output two mechanical torques with the same rotating speed and opposite directions, and the speed of double propeller rotation can be precisely adjusted through the frequency converter, which continues the advantage of this type of motor without axial torque, and at the same time has the efficiency of permanent magnet synchronous motor High, high torque density and other advantages.

Description of drawings

Fig. 1 is the schematic diagram of motor structure of the present invention;

Fig. 2 is a schematic diagram of the connection at the end of the motor stator ring cross winding of the present invention:

Fig. 3 is the distribution diagram of the counter-rotating magnetic field produced by the single-feed ring cross winding of the motor stator of the present invention:

(a) When the current phase ωt=0°, the distribution diagram of the counter-rotating magnetic field generated by the single-feed ring cross winding of the stator

(b) When the current phase ωt=30°, the distribution diagram of the counter-rotating magnetic field generated by the single-feed ring cross winding of the stator

(c) When the current phase ωt=60°, the distribution diagram of the counter-rotating magnetic field generated by the single-feed ring cross winding of the stator

(d) When the current phase ωt=90°, the distribution diagram of the counter-rotating magnetic field generated by the single-feed ring cross winding of the stator

(e) When the current phase ωt=120°, the distribution diagram of the counter-rotating magnetic field generated by the single-feed ring cross winding of the stator

(f) When the current phase ωt=150°, the distribution diagram of the counter-rotating magnetic field generated by the single-feed ring cross winding of the stator

In Fig. 1: 1 casing, 2 solid shaft, 3 hollow shaft, 4 stator front end cover, 5 casing bearing front end cover, 6 inner permanent magnet rotor, 7 inner rotor permanent magnet, 8 stator, 9 casing front end cover, 10 Stator connector, 11 outer rotor permanent magnet, 12 outer permanent magnet rotor, 13 outer fixing piece, 14 casing rear end cover, 15 outer rotor rear end cover, 16 stator rear end cover, 17 outer wiring hole, 18 outer shaft rear Bearing, 19 housing bearings, 20 outer rotor front bearings, 21 inner rotor front bearings, 22 inner shaft rear bearings.

Detailed ways

The motor of the present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the structure schematic diagram of the motor of the present invention, the solid shaft 2 and the hollow shaft 3 are concentric, and the left end of the solid shaft 2 is sequentially assembled with an inner shaft front bearing 21, a stator front end cover 4, an outer shaft front bearing 20, Hollow shaft 3, casing bearing 19, casing bearing front end cover 5, and the right end of solid shaft 2 are installed sequentially from inside to outside as inner shaft rear bearing 22, stator rear end cover 16, outer shaft rear bearing 18, outer rotor rear end cover 15 1. The rear end cover 14 of the casing, the middle part of the solid shaft is assembled with the inner permanent magnet rotor 6, the stator 8, the outer permanent magnet rotor 12 and the casing 1 in sequence from the inside to the outside along the vertical direction, and the inner permanent magnet rotor 6 is fixed on the solid shaft 2 , there is a connecting piece 10 in the middle of the stator 8, and this connecting piece 10 plays the role of tightening the stator silicon steel sheet. The left end of the connecting piece 10 is assembled on the stator front end cover 4, and the right end is assembled on the stator rear end cover 16. The end cover 16 is provided with an external wiring hole 17 near the bearing, through which the frequency converter supplies power directly to the internal stator winding. The left end of the outer permanent magnet rotor 12 is connected with the hollow shaft 3 through screws, and the right end is connected with the rear end cover 15 of the outer rotating shaft through screws. The stator 8, the stator front end cover 4, the stator rear end cover 16 and the stator connector 10 together form the structure of the stator system, and the hollow shaft 3, the outer permanent magnet rotor 12 and the outer rotor rear end cover 15 jointly form the structure of the outer rotor rotation system. The inner permanent magnet rotor 6 and the solid shaft 2 together form the structure of the inner rotor rotation system, and the solid shaft 2 is longer than the hollow shaft 3 .

Place the inner rotor front bearing 21 and the inner shaft rear bearing 22 respectively between the inner rotor rotation system and the stationary stator system; respectively place the outer shaft front bearing 20 and the outer shaft rear bearing between the stationary stator system and the outer rotor rotation system 18. The two sets of bearing systems cleverly separate the inner rotor rotating system, the stationary stator system and the outer rotor rotating system to ensure their independent and stable operation, which is the key to realize the output of dual mechanical ports. The casing bearing between casing 4 plays the role of supporting and positioning the outer rotor rotating system.

Since both the stator and the outer rotor rotating system use two sets of bearings to support the double-ended fixed structure, the overall stability of the motor has been greatly improved, allowing the motor to output greater power and operate at a higher speed. Stable operation expands the application field of the motor.

Figure 2 is a schematic diagram of the end connection of the stator ring cross winding. Taking a 6-pole 36-slot motor as an example, the end connection of the ring cross winding of the motor is drawn. In the figure, A-X, B-Y, and C-Z are the connectors of the three-phase winding respectively. , the upper slot and the lower slot are the slots on the surface of the inner circular wall of the stator and the slots on the surface of the outer circular wall respectively. It can be seen from the figure that the single-feed ring cross stator winding is from the outer circular wall slot through the end of the stator Winding to the inner circular wall slot, the B and C phase windings in the upper slot and the lower slot are crossed and exchanged at the end of the stator, which makes the phase sequence of the winding in the upper slot and the lower slot reversed, that is, the inner circular wall of the stator and the outer The phase sequence of the windings in the round-walled slots is reversed. In this way, when a group of three-phase symmetrical alternating current is fed in, two magnetic fields rotating in different directions and at the same speed can be generated in the air gap on both sides of the stator, thereby driving the two rotors to output different torques from the two mechanical ports.

Figure 3 is the distribution diagram of the counter-rotating magnetic field generated by the stator single-feed ring cross winding. Taking a 6-pole motor as an example, when the stator winding is supplied with a three-phase symmetrical current, as the current phase (or time) changes, the direction of the magnetic field (short and thick arrow) generated inside the stator rotates clockwise, while the magnetic field generated outside the stator The direction (thin arrow) rotates counterclockwise, and the two rotating magnetic fields rotate at the same speed.

Claims (2)

1. A permanent magnet synchronous motor with a single electrical port and reverse dual mechanical ports at the same speed, comprising a stator (8), an inner permanent magnet rotor (6), an outer permanent magnet rotor (12), a hollow shaft (3), a solid Shaft (2), stator front end cover (4), stator rear end cover (16), outer rotor rear end cover (15), casing front end cover (9), casing rear end cover (14), bearing, front bearing The end cover (5), the casing (1) and the external wiring hole (17), are characterized in that the solid shaft (2) and the hollow shaft (3) are concentric, and the left end of the solid shaft (2) is from the inside to the outside The front bearing of the inner shaft (21), the front end cover of the stator (4), the front bearing of the outer shaft (20), the hollow shaft (3), the casing bearing (19), the front end cover of the casing bearing (5), and the solid shaft are assembled in sequence (2) The right end is sequentially assembled with the inner shaft rear bearing (22), the stator rear end cover (16), the outer shaft rear bearing (18), the outer rotor rear end cover (15) and the casing rear end cover (14) from the inside to the outside ), the middle part of the solid shaft (2) is sequentially assembled with an inner permanent magnet rotor (6), a stator (8), an outer permanent magnet rotor (12) and a casing (1) along the vertical direction from inside to outside, and the inner permanent magnet The rotor (6) is fixed on the solid shaft (2); a connector (10) is pierced in the middle of the stator (8), the left end of the connector (10) is fixed on the stator front end cover (4), and the right end is fixed on the On the stator rear end cover (16); the left end of the outer permanent magnet rotor (12) is connected with the hollow shaft (3), and the right end is connected with the outer rotating shaft rear end cover (15); the inner circular wall of the stator (8) and The outer circular wall is evenly slotted, and a single-feed ring-type cross-over three-phase stator winding is embedded; the single-feed ring-type cross-stator winding is wound from the outer circular wall slot to the inner circular wall slot through the end of the stator, and the stator ( 8) Any two-phase winding in the winding embedded in the inner slot and the outer slot forms a single-feed ring cross stator winding at the cross-exchange position at the end of the stator (8). 2. A permanent magnet synchronous motor with a single electric port and reverse dual mechanical ports at the same speed according to claim 1, characterized in that the A-phase winding of the single-feed ring type cross three-phase stator winding is connected from the outside of the stator The circular wall slots are wound to the corresponding inner circular wall slots of the stator through the end of the stator, and the windings in the inner and outer circular wall slots of the B-phase winding and the C-phase winding are crossed and exchanged at the end of the stator so that the three-phase windings are in the inner circle of the stator. The phase sequence of the windings in the wall slot and the outer circular wall slot is opposite.

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