Motor rotor, assembly method thereof and motor

Abstract

The invention provides a motor rotor, an assembly method and a motor. The motor rotor is used in a permanent-magnet synchronous motor and comprises a rotor core, wherein a first end ring and a secondend ring are respectively arranged at two ends of the rotor core, a plurality of magnetic isolation guide strips are connected between the first end ring and the second end ring, the plurality of magnetic isolation guide strips penetrate through grooves in the rotor core, a plurality of magnetic steel grooves are formed in the rotor core, and the grooves are arranged in a region between two magnetic steel grooves with opposite-polarity magnetic poles. In the motor rotor, the assembly method thereof and the motor, provided by the invention, the magnetic isolation guide strips are connected withthe end rings, the connection reliability and the structure integration of the motor rotor are improved, and meanwhile, magnetic isolation can be performed on adjacent opposite-polarity magnetic poles of the motor rotor.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a motor rotor, an assembly method thereof, and a motor. Background technique [0002] At present, high-speed permanent magnet synchronous motors are developing rapidly and are widely used in centrifuges and other working conditions of HVAC equipment. Due to the high speed of the motor (generally above 10,000rpm) and the large moment of inertia of the rotor, the rotor structure generally adopts the impact motor. Slender rotor core with small outer diameter and large stack thickness (embedded magnetic steel 5'), figure 1 A side view of the current motor rotor is given, figure 2 gives figure 1 The sectional view of the motor rotor of the structure shows the common structure of the current high-speed permanent magnet synchronous motor rotor punching plate 6', in which four small round holes 1' can be used for cooling and ventilation, and eight long slots 2'...

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Problems solved by technology

[0003] However, since the existing slot wedge 3' is mostly made of non-metallic insulating material, and the end ring 4' is made of metal non-magnetic material, the two cannot be connected together structurally, the stability and reliability of the rotor connection is not high, and the structural integrity is poor; In addition, when the load of the motor is unbalanced or the motor has an asymmetrical short circuit, the rotor will have a short-term axial flow current. The frequency of this current is the induced current twice the frequency of the inverter current. The induced current will heat the rotor, which is extremely dangerous. It may cause irreversible demagnetization of the magnetic steel, that is, the existing slot wedge structure cannot protect the rotor under abnormal conditions of motor operation

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