CN-224233421-U - High-speed permanent magnet synchronous motor rotor for dynamometer

Abstract

The utility model discloses a high-speed permanent magnet synchronous motor rotor for a dynamometer, which comprises a rotor shaft, wherein a plurality of axial vent holes along the axial direction and radial vent holes along the radial direction are formed in the rotor shaft, the axial vent holes are formed in one end of the rotor shaft, the radial vent holes are formed in the other end of the rotor shaft, the axial vent holes are communicated with the radial vent holes, a plurality of magnetic isolation strips are uniformly arranged at intervals in the circumferential direction of the rotor shaft, a permanent magnet is arranged between the magnetic isolation strips, and a carbon fiber sheath is sleeved on the outer surface of the permanent magnet.

Inventors

• LI YONGHONG
• LI TINGTING

Assignees

• 苏州艾克斯电机技术有限公司

Dates

Publication Date

20260512

Application Date

20250526

Claims (7)

1. 1. The utility model provides a high-speed permanent magnet synchronous motor rotor for dynamometer, its characterized in that includes rotor shaft (1), a plurality of axial ventilation holes (11) and radial ventilation holes (12) along its radial are seted up to rotor shaft (1) inside, axial ventilation holes (11) are seted up in the one end of rotor shaft (1), radial ventilation holes (12) are seted up at the other end of rotor shaft (1), axial ventilation holes (11) and radial ventilation holes (12) intercommunication, rotor shaft (1) circumference evenly spaced are provided with a plurality of magnetism isolating strips (2), are provided with permanent magnet (3) between magnetism isolating strips (2), permanent magnet (3) surface cover is equipped with carbon fiber sheath (4).
2. 2. The high-speed permanent magnet synchronous motor rotor for the dynamometer of claim 1, wherein the rotor shaft (1) is a hollow shaft.
3. 3. The high-speed permanent magnet synchronous motor rotor for the dynamometer of claim 2, wherein balance rings (5) are arranged at two ends of the rotor shaft (1).
4. 4. The high-speed permanent magnet synchronous motor rotor for the dynamometer of claim 3, wherein the balancing ring (5) is provided with a plurality of screw holes (51) radially and uniformly.
5. 5. The high-speed permanent magnet synchronous motor rotor for the dynamometer of claim 1, wherein the rotor shaft (1) is provided with a positioning groove (13), and the magnetism isolating strips (2) are embedded into the positioning groove (13) and fixed.
6. 6. The rotor of the high-speed permanent magnet synchronous motor for the dynamometer of claim 3 or 4, wherein positioning steps (14) matched with the balance ring (5) are formed at two ends of the rotor shaft (1), and the balance ring (5) is in interference fit with the positioning steps (14).
7. 7. The high-speed permanent magnet synchronous motor rotor for the dynamometer of claim 6, wherein the balance ring (5) is made of stainless steel.

Description

High-speed permanent magnet synchronous motor rotor for dynamometer Technical Field The utility model relates to the technical field of motor rotor cooling, in particular to a high-speed permanent magnet synchronous motor rotor for a dynamometer. Background In the field of high-speed permanent magnet synchronous motors for dynamometers, a rotor cooling technology is a key for guaranteeing efficient and stable operation of the motor. At present, a conventional cooling scheme mainly adopts a liquid cooling system, and the cooling system utilizes cooling liquid to circularly flow in a pipeline through the synergistic effect of a cooling pipeline, a radiator, an electric pump and other components to absorb and take away heat generated by the operation of a rotor. The liquid cooling technology relies on the characteristic of high specific heat capacity of cooling liquid, can meet the heat dissipation requirement under the working condition of high power density, and ensures the stable operation of the motor under the conditions of high speed and high load. However, the existing liquid cooling technology has the obvious defects that firstly, the system structure is complex, the technology difficulty is high, the cost is high due to the cooperative design and manufacture of multiple components, the initial investment is high, the later-stage cooling liquid replacement and system maintenance cost are greatly increased, secondly, the sealing performance is strictly required, once the sealing failure causes the leakage of the cooling liquid, serious faults such as motor short circuit and the like can be caused, and the service life of equipment can be shortened due to the corrosion problem of the cooling liquid to the motor components after long-term use. Disclosure of utility model The utility model mainly solves the technical problem of providing the high-speed permanent magnet synchronous motor rotor for the dynamometer, which can effectively dissipate heat under the condition of not using cooling liquid and simplifying the rotor structure. In order to solve the technical problem, the utility model adopts the technical scheme that the rotor of the high-speed permanent magnet synchronous motor for the dynamometer comprises a rotor shaft, wherein a plurality of axial vent holes along the axial direction and radial vent holes along the radial direction are formed in the rotor shaft, the axial vent holes are formed in one end of the rotor shaft, the radial vent holes are formed in the other end of the rotor shaft, the axial vent holes are communicated with the radial vent holes, a plurality of magnetic isolation strips are uniformly arranged at intervals in the circumferential direction of the rotor shaft, permanent magnets are arranged between the magnetic isolation strips, and carbon fiber sheaths are sleeved on the outer surfaces of the permanent magnets. Preferably, the rotor shaft is a hollow shaft. Preferably, the rotor shaft is provided with balancing rings at both ends. Preferably, the balance ring is radially and uniformly provided with a plurality of screw holes. Preferably, the rotor shaft is provided with a positioning groove, and the magnetic isolation strips are embedded into the positioning groove and fixed. Preferably, the two ends of the rotor shaft are provided with positioning steps matched with the balance ring, and the balance ring is in interference fit with the positioning steps. Preferably, the balance ring is made of stainless steel. The utility model has the beneficial effects that the axial vent holes and the radial vent holes are formed on the rotor shaft so as to penetrate through the interior of the rotor shaft, and further the air duct passing through the interior of the rotor shaft is increased, thereby increasing the cooling efficiency of the rotor shaft. And the complex structure of the traditional liquid cooling system is obviously simplified as a whole, and the manufacturing cost and the maintenance difficulty are reduced. The accurate cooperation design of location step and balanced ring screw hole has further strengthened mechanical fixation reliability and dynamic balance and has adjusted the convenience. Drawings FIG. 1 is a schematic overall construction of the present utility model; FIG. 2 is a schematic illustration of the structure of the present utility model with the carbon fiber sheath removed; FIG. 3 is a schematic structural view of the rotor shaft of the present utility model; Fig. 4 is a cross-sectional view of the present utility model. The components in the drawings are marked as follows: 1. Rotor shaft, 11, axial vent holes, 12, radial vent holes, 13, positioning grooves, 14 and positioning steps; 2. A magnetic isolation strip; 3. A permanent magnet; 4. a carbon fiber sheath; 5. balance ring, 51, screw hole. Detailed Description In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of