Direct-drive direct-current brushless motor

Abstract

Existing direct-current motors are magnetic pole change type direct-current motors, or direct-current motors which change the current direction of coils in the motors through commutators or brushless motors which replace mechanical commutators through electronic commutators, the mechanical commutators can generate electric sparks and energy loss, the electronic commutators are accurate in control but complex in structure, and the cost is low. In addition, due to the fact that current commutation of coils in the motor exists, hysteresis loss and eddy-current loss exist, and therefore the motor solution is provided to solve the problems.

Description

Technical Field

[0001] Brushless DC motor field. Background Art

[0002] At present, DC motors are all DC motors with alternating magnetic field directions N and S and positive and negative pole changes, or DC motors that change the direction of the current in the motor's internal coils through a commutator, or brushless motors that replace the mechanical commutator with an electronic commutator. Although they are nominally DC motors, they all convert DC power into AC power before supplying it to the coils inside the motor. Mechanical commutators will produce sparks and energy losses. Although electronic commutators have precise control, they require a combination of electronic circuits to work, have a complex structure, and the electronic circuit part will also consume electrical energy. In addition, since there is current commutation in the motor's internal coils, there will be hysteresis loss and eddy current loss, and there will be electrical energy loss. Therefore, this type of motor solution is proposed to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a new design method for a DC motor in view of the shortcomings of the existing DC motor: it does not require the commutator of the DC motor, nor the electronic commutator of the existing brushless motor, and directly uses DC power to operate the motor. The method is characterized by the following methods: (1) redesigning the NS pole direction of the permanent magnet pole so that the magnetic pole direction of the magnet remains unchanged during the operation of the motor. (2) redesigning the wiring arrangement and connection method inside the motor so that the direction of the current in the wire remains unchanged during the operation of the motor. (3) redesigning the stacked motor wiring slot and layout so that the magnetic conductor can cooperate with the electromagnetic field generated by the wire current to work in the original directional magnetic field of the motor.

[0004] Compared with the prior art, the present invention has the following beneficial effects: (1) There is no need for the mechanical commutator of the DC motor, nor the electronic commutator of the brushless motor, so the motor working system is simpler. (2) There is no electric spark and noise from the mechanical commutator, which reduces friction. There is no power loss from the mechanical commutator. The electronic commutator of the brushless DC motor is eliminated, making the drive of the DC motor simpler and more stable. There is no power loss in the electronic circuit, making the DC motor more energy-efficient. There is no alternating magnetic field, which reduces hysteresis loss and eddy current loss. (3) The relay working mode of alternating magnetic poles during motor operation is eliminated, making the motor work smoother and quieter. (4) There is no performance constraint of mechanical commutator and electronic commutator, making the DC motor more adaptable to the working requirements of high power and high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1It is a direct-drive brushless DC motor structure with axial arrangement of permanent magnet magnetic pole direction, in the figure: 1, motor front end cover, 11, motor rear end cover, 2, motor stator, 21, motor N half stator conductor core, 22, motor S half stator conductor core, 31, motor N half rotor, 32, motor S half rotor, 4, motor shaft, 5, axially magnetized permanent magnet, 6, motor housing; Figure 2 It is a structural diagram of the toothed rotor punching; Figure 3 This is the overall diagram of the motor.

[0006] Figure 4 This is the motor split diagram. DETAILED DESCRIPTION

[0007] The direct-drive brushless DC motor of the present invention forms a single unchanged magnetic field structure by redesigning the magnetic field arrangement structure of the DC motor, and redesigns the arrangement mode of the motor wires so that the wires in the single-direction magnetic field are subjected to the Ampere force in the same direction under the action of the DC current, and the magnetic field of the motor permanent magnet passes through the wires vertically as much as possible, and the electromagnetic field of the wire current and the magnetic field of the motor rotor are aggregated as much as possible so that the Ampere force formed by the interaction between them forms the motor torque. The motor rotor is a toothed structure to form an uneven magnetic field. The direct-drive brushless DC motor does not require a mechanical commutator or an electronic commutator, and can drive the rotation of the DC motor through DC power, and eliminates the mode of converting DC power into AC power and then supplying the motor coil, thereby simplifying the driving mode of the DC motor. Its specific working mode is described by the accompanying drawings: As attached Figure 1 The motor is composed of a motor front end cover (1), a motor rear end cover (11), a motor stator (2), a motor N half stator conductor core (21), a motor S half stator conductor core (22), a motor N half rotor (31), a motor S half rotor (32), a motor shaft (4), an axially magnetized permanent magnet (5), and a motor housing (6), as shown in the attached Figure 4 The motor rotor is composed of a motor shaft (4), a motor N half rotor (31), a motor S half rotor (32), and an axially magnetized permanent magnet (5). The motor shaft (4) is inserted through the center of the motor N half rotor (31), the motor S half rotor (32), and the axially magnetized permanent magnet (5) and is fixedly connected. The motor N half rotor (31) and the motor S half rotor (32) are distributed on both sides of the axially magnetized permanent magnet (5). The axially magnetized permanent magnet (5) is magnetized along the axial direction of the motor, and the magnetization direction is that the N pole points to the motor N half rotor (31), and the S pole points to the motor S half rotor (32). As shown in the attached figure Figure 4The motor stator (2) is composed of a motor N half stator conductor core (21) and a motor S half stator conductor core (22). The N half stator conductor core (21) and the motor S half stator conductor core (22) are cores wound with wires. The N half stator conductor core (21) and the motor S half stator conductor core (22) are fitted in the motor housing (6). The magnetic field path in the motor is that the magnetic field starts from the N pole of the axially magnetized permanent magnet (5) and is first transmitted to the motor N half rotor (31), then penetrates the wire and is transmitted to the motor N half stator conductor core (21), then is transmitted to the motor S half stator conductor core (22) fitted therewith, and then penetrates the wire again to reach the motor S half rotor (32 ), and then returns to the S pole of the axially magnetized permanent magnet (5), so that the magnetic field passes through a closed path. The current directions of the wires in the N half stator conductor core (21) and the S half stator conductor core (22) of the motor are opposite. The direction of the NS pole magnetic field of this magnetic field remains unchanged during the operation of the motor. The unchanged direction of the permanent magnet magnetic field is the basis for the motor to rotate while the current direction of the wires in the motor remains unchanged. The motor stator (2) and the motor N half rotor (31) and the motor S half rotor (32) are laminated assembled good conductive magnets to facilitate the internal conduction of the magnetic field, and to minimize the distance between the motor rotor and the stator slots so that as much magnetic field as possible is transmitted through the stator of the good conductive magnet to enhance the Ampere force of the magnetic field on the wire. The current directions in the stator wires corresponding to the N-pole side and the S-pole side are opposite, so that the wires fit the motor stator ⑵ as closely as possible in the stator. The inner surface of the motor stator ⑵ is a smooth structure. The stator makes the permanent magnet magnetic field pass through the wire as vertically as possible, and at the same time aggregates the electromagnetic force of the wire as much as possible, so that the permanent magnet magnetic field and the electromagnetic force of the wire interact to generate the largest possible Ampere force; As attached Figure 1 and attached Figure 2 ., the rotor adopts a tooth structure, and an uneven magnetic field is established in the air gap of the motor. This uneven magnetic field is the key to the rotation of the rotor. The left-hand rule: stretch out your left hand, make the thumb perpendicular to the other four fingers and in the same plane, let the magnetic flux lines flow into the palm of your hand, and the four fingers point to the direction of the current. The direction pointed by the thumb is the direction of the Ampere force, that is, the direction of the force on the conductor. The left-hand rule is a law that determines the relationship between the direction of the Ampere force, the direction of the magnetic induction intensity, and the direction of the current of the conductor when the current-carrying wire is in a magnetic field. Combined with the attached Figure 1 Attached Figure 2 Attached Figure 4, according to the analysis of the N half stator conductor core (21) and the S half stator conductor core (22) of the motor, they are in the air gap magnetic field established by the toothed rotor, so an Ampere force is generated. The left-hand rule is applicable. According to the analysis of the left-hand rule, the currents passed through the N half stator conductor core (21) and the S half stator conductor core (22) of the motor are opposite in direction. Since the magnetic fields on both sides are opposite in direction, the Ampere forces on both sides are in the same direction. According to the analysis of the rotor, the magnetic field established by the rotor causes the conductor to be subjected to an Ampere force in the same direction, so the magnetic field will also be subjected to a reaction force in the opposite direction. At the same time, the rotor magnetic field is generated by the toothed structure, so that the axially magnetized permanent magnet (5) forms an uneven magnetic field in the air gap of the same polarity on the rotor. The stator surface is a smooth structure without teeth, so the uneven magnetic field in the air gap will have a certain mutual anchoring effect with the rotor. Therefore, the magnetic field subjected to the reaction force of the conductor will transmit the reaction force to the rotor. Under this reaction force, the rotor will rotate, and this motor will be able to rotate normally.

[0008] The above scheme is used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. Direct drive brushless DC motor, characterized by: The motor comprises a front end cover (1), a rear end cover (11), a motor stator (2), a motor N half stator conductor core (21), a motor S half stator conductor core (22), a motor N half rotor (31), a motor S half rotor (32), a motor shaft (4), an axially magnetized permanent magnet (5), and a motor housing (6).

2. The direct-drive brushless DC motor according to claim 1, characterized in that: The motor rotor is composed of a motor shaft (4), a motor N half rotor (31), a motor S half rotor (32), and an axially magnetized permanent magnet (5). The motor shaft (4) is inserted through the center of the motor N half rotor (31), the motor S half rotor (32), and the axially magnetized permanent magnet (5) and is fixedly connected. The motor N half rotor (31) and the motor S half rotor (32) are distributed on both sides of the axially magnetized permanent magnet (5). The axially magnetized permanent magnet (5) is magnetized along the axial direction of the motor, and the magnetization direction is that the N pole points to the motor N half rotor (31), and the S pole points to the motor S half rotor (32).

3. The direct-drive brushless DC motor according to claim 1, characterized in that: The motor stator (2) is composed of a motor N-half stator conductor core (21) and a motor S-half stator conductor core (22). The N-half stator conductor core (21) and the motor S-half stator conductor core (22) are cores for winding conductors. The N-half stator conductor core (21) and the motor S-half stator conductor core (22) are fitted and installed in a motor housing (6).

4. The direct-drive brushless DC motor according to claim 1, characterized in that: The magnetic field path in the motor is such that the magnetic field starts from the N pole of the axially magnetized permanent magnet (5) to the N half rotor (31) of the motor, passes through the wire to the N half stator wire core (21) of the motor, passes to the S half stator wire core (22) of the motor that fits therewith, passes through the wire to the S half rotor (32) of the motor, and returns to the S pole of the axially magnetized permanent magnet (5), so that the magnetic field passes through a closed path.

5. The direct-drive brushless DC motor according to claim 3, characterized in that: The currents flowing through the conductors in the N-half stator conductor core (21) and the S-half stator conductor core (22) of the motor are in opposite directions.

6. The direct-drive brushless DC motor according to claim 2, characterized in that: The surface of the motor rotor is a toothed structure, and the surface of the motor stator is a smooth structure.

7. The direct-drive brushless DC motor according to claim 2, characterized in that: Motor air gap non-uniform magnetic field and toothed rotor anchoring.

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