CN105958767A - Built-in radial rare earth permanent magnet steel drive motor for electric automobiles - Google Patents

Abstract

The invention provides a built-in radial rare earth permanent magnet steel drive motor for electric automobiles, and belongs to the technical field of electric automobile motors and appliances. The drive motor is composed of a front end cover, a rear end cover, a case, a rotor, and a stator. The rotor of the drive motor is an embedded permanent magnet rotor with a radial magnetic field, the magnetic field is strong, and the power density is high. The structure is a rotor magnetic bypass structure, which can effectively prevent the problem that permanent magnet steel pieces generate irreversible demagnetization under the armature reaction effect of impact current and ensure that the permanent magnet steel pieces do not lose magnetism. No electric excitation winding is needed, and there is less power consumption. There is neither carbon brush nor mechanical commutator, and the failure rate is low. The drive motor has a compact structure, and works reliably.

Description

Built-in radial rare earth permanent magnet steel drive motor for electric vehicles

technical field

The invention provides a built-in radial rare earth permanent magnet steel driving motor of an electric vehicle, which belongs to the technical field of electric vehicle motors and appliances.

Background technique

At present, most of the driving motors used with electric vehicles are DC motors with carbon brushes and mechanical commutators. Although DC motors have simple structure, high controllability, wide speed range, relatively simple control circuit, and low cost, but Since the magnetic field of the DC drive motor is generated by the electric excitation winding, the power consumption is large and the output efficiency is low. In addition, due to the existence of carbon brushes and mechanical commutators, it not only limits the improvement of the overload capacity and speed of the drive motor, but also if it runs for a long time, it is bound to Frequent maintenance and replacement of carbon brushes and commutators is required, so the DC motor consumes a lot of energy and has a high failure rate, and its performance needs to be further improved.

Contents of the invention

The purpose of the present invention is to provide a built-in diameter electric vehicle that can overcome the above defects, the magnetic field of the drive motor is provided by the built-in permanent magnet steel, no need for electric excitation winding, less power consumption, no carbon brush and mechanical commutator, and low failure rate. Drive the motor to rare earth permanent magnet steel, and its technical content is:

The electric vehicle built-in radial rare earth permanent magnet steel drive motor is composed of a front end cover, a rear end cover, a casing, a rotor and a stator, and is characterized in that: the drive motor rotor is a built-in radial rare earth permanent magnet steel rotor;

The built-in radial rare earth permanent magnet steel rotor is composed of a shaft, a rectangular permanent magnet steel, and a rotor core. There are an even number of rectangular slots running through the thickness of the rotor core distributed on the rotor core. Two adjacent rectangular slots form a positive "eight" Shaped or inverted "eight", the outer ends of the two rectangular grooves forming a positive "eight" shape are not connected, the inner ends of the two rectangular grooves forming an inverted "eight" shape are not connected, and the outer ends of the rectangular grooves are connected to the rotor iron The outer circle of the core is not connected, and the inner end of the rectangular slot is not connected with the inner circle of the rotor core. Two identical rectangular permanent magnet steels are respectively placed on the two sides of the inverted "eight" shape of the rotor core. In a rectangular slot and the inner side of the inverted "eight" shape formed by two rectangular permanent magnet steels is N pole, and then the other two identical rectangular permanent magnetic steels are respectively placed in the other two rectangular permanent magnet steels adjacent to the rotor core. In the inverted "eight"-shaped groove formed by the groove and the inner side of the inverted "eight" shape formed by two pieces of rectangular permanent magnet steel are all S poles, and so on, forming a built-in radial rare earth permanent magnet with N poles and S poles arranged at intervals Steel rotor, the rotor core is press-fitted on the shaft.

Working principle: When the permanent magnet drive motor is connected to the three-phase alternating current modulated by the pulse width of the three-phase inverter, the armature winding of the driving motor generates a spatial rotating magnetic field, which interacts with the magnetic field generated by the permanent magnet steel of the rotor. The rotor generates a rotational torque consistent with the direction of the armature winding's rotating magnetic field, which drives the permanent magnet rotor of the drive motor to drive the electric vehicle.

Compared with the prior art, the present invention has rectangular permanent magnet steel embedded in the rectangular slot of the rotor iron core, and the rotor magnetic field of the drive motor is provided by the radial magnetic field, which has high magnetic field strength and high power density, and does not require electric excitation windings and power consumption Less, no carbon brush and mechanical commutator, low failure rate, high efficiency, high power density, compact structure, reliable operation, etc.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a sectional view of the rotor of the embodiment shown in Fig. 1 .

In the figure: 1. Shaft 2. Front end cover 3. Rectangular permanent magnet steel 4. Rotor core 5. Case 6. Stator 7. Rear end cover.

detailed description

The present invention will be further described below in conjunction with accompanying drawing:

The built-in radial rare earth permanent magnet steel driving motor of electric vehicles is composed of a front end cover 2, a rear end cover 7, a casing 5, a rotor, and a stator 6, and is characterized in that the drive motor rotor is a built-in radial rare earth permanent magnet steel rotor;

The built-in radial rare earth permanent magnet steel rotor is composed of shaft 1, rectangular permanent magnet steel 3 and rotor core 4. There are an even number of rectangular slots running through the thickness of the rotor core 4 distributed on the rotor core 4. The adjacent two rectangular slots Forming a positive "eight" shape or an inverted "eight" shape, the outer ends of the two rectangular grooves forming a positive "eight" shape are not connected, and the inner ends of the two rectangular grooves forming an inverted "eight" shape are not connected. There is no connection between the outer end and the outer circle of the rotor core 4, and there is no communication between the inner end of the rectangular slot and the inner circle of the rotor core 4, and two identical rectangular permanent magnet steels 3 are respectively placed on the rotor core In the two rectangular slots of the inverted "eight" shape of 4 and the inner side of the inverted "eight" shape formed by two rectangular permanent magnet steels 3 are all N poles, and then place the other two identical rectangular permanent magnetic steels 3 respectively In the inverted "eight"-shaped groove formed by the other two adjacent rectangular grooves of the rotor core 4 and the inner side of the inverted "eight" shape formed by two pieces of rectangular permanent magnet steel 3 are all S poles, and so on, forming N poles. The built-in radial rare earth permanent magnet steel rotor with poles and S poles arranged at intervals, and the rotor core 4 is press-fitted on the shaft 1.

Claims (1)

1. An electric vehicle built-in radial rare earth permanent magnet steel drive motor, which consists of a front cover (2), a rear end cover (7), a casing (5), a rotor, and a stator (6), and is characterized in that the drive motor The rotor is a built-in radial rare earth permanent magnet steel rotor; The built-in radial rare earth permanent magnet steel rotor is composed of a shaft (1), a rectangular permanent magnet steel (3), and a rotor core (4). Rectangular groove, two adjacent rectangular grooves form a positive "eight" shape or an inverted "eight" shape, the outer ends of the two rectangular grooves forming a positive "eight" shape are not connected, forming two rectangles in an inverted "eight" shape The inner end of the slot is not connected, the outer end of the rectangular slot is not connected to the outer circle of the rotor core (4), and the inner end of the rectangular slot is not connected to the inner circle of the rotor core (4), it will be exactly the same The two pieces of rectangular permanent magnet steel (3) are respectively placed in the two rectangular slots of the inverted "eight" shape of the rotor core (4) and the inner side of the inverted "eight" shape formed by the two pieces of rectangular permanent magnet steel (3) They are all N poles, and then place the other two identical rectangular permanent magnet steels (3) in the inverted "eight"-shaped grooves formed by the other two adjacent rectangular grooves of the rotor core (4) and the two pieces The inner sides of the inverted "eight" shape formed by the rectangular permanent magnet steel (3) are all S poles, and so on, forming a built-in radial rare earth permanent magnet steel rotor with N poles and S poles arranged at intervals, and the rotor core (4) is press-fitted on axis (1).