Motor without permanent magnet magnetic circuit

Abstract

The invention provides a motor with a brand new driving principle, namely a permanent-magnet-free magnetic circuit motor, which comprises an electromagnet and a magnetic circuit, the electromagnet comprises a coil and an iron core, the magnetic circuit consists of a plurality of soft magnetic materials, and two adjacent magnetic circuits are mutually independent and are fixed by adopting a non-ferromagnetic material; the electromagnet and the magnetic circuit mutually rotate to always have a magnetic circuit unblocked position and a magnetic circuit blocked position. Two feasible design schemes of the six-stage internal magnetic circuit motor are shown in the figure, a coil is hidden, and green is made of a non-ferromagnetic material; in the left picture, each magnetic circuit is independent of each other and is fixed into a whole by using a non-ferromagnetic material; because the magnetic flux directions of the inter-phase magnetic circuits are the same, the scheme in the right figure can be adopted, and only adjacent magnetic circuits are independent.

Description

Technical Field

[0001] The present invention relates to motors, in particular to a motor without a permanent magnet magnetic circuit. Background Art

[0002] 1. The asynchronous motor is not directly driven by magnetic force and has low energy efficiency.

[0003] 2. Permanent magnet synchronous motors use permanent magnets, which are expensive, have a small power range, and are subject to the risk of demagnetization.

[0004] 3. The magnetic circuit of the reluctance synchronous motor is complex, magnetic leakage is serious, and electromagnetic utilization is low.

[0005] 4. Only a small part of the coils of the switched reluctance motor are working, and the energy density is low.

[0006] We need a synchronous motor that uses soft magnetic materials to replace permanent magnets and has a wide power range, low magnetic leakage and relatively high energy density. Summary of the Invention

[0007] The present invention provides a motor with a completely new driving principle, a motor without a permanent magnet magnetic circuit; the motor comprises an electromagnet and a magnetic circuit, which serve as a stator and a rotor respectively; when the electromagnet and the magnetic circuit rotate relative to each other, there is always a position where the magnetic circuit is open and a position where the magnetic circuit is blocked.

[0008] This motor is a synchronous motor driven directly by magnetic force. Compared with asynchronous motors, the magnetic circuit does not generate induced current and has a high energy efficiency ratio. The magnetic circuit is made of soft magnetic materials such as silicon steel sheets and pure iron instead of permanent magnet materials. Compared with permanent magnet synchronous motors, it has low cost, wide power range and no demagnetization risk.

[0009] This motor has a clear magnetic circuit, and the two adjacent magnetic circuits are independent of each other, with minimal magnetic leakage and high electromagnetic utilization, making it superior to reluctance synchronous motors in all aspects. This motor can use three-phase sine waves or square waves. When using square waves, both phases can be energized at the same time, and its energy density is higher than that of switched reluctance motors.

[0010] The following attached Figures 1 to 4 】 is the driving principle of the motor without permanent magnet magnetic circuit; sea blue represents the iron block, red and blue represent magnets, and green represents non-ferromagnetic materials.

[0011] Figure 1 In order to put the magnet into the circular iron block and keep them at the same center, they can rotate relative to each other; no matter where the iron block is, the attraction of the magnet to the circular iron block remains unchanged, and the iron block can rotate easily with the magnet fixed.

[0012] Figure 2The circular iron block is divided into multiple iron blocks according to the number of magnetic poles of the magnet, that is, multiple independent magnetic circuits, and has a certain space distance, and is fixed together through non-ferromagnetic material; when the magnetic pole of the magnet is aligned with a single magnetic circuit, the magnetic force line outside the magnet cannot pass through the magnetic circuit, and the attraction of the magnet to the magnetic circuit is minimum, and the magnetic circuit will rotate to the position with greater attraction.

[0013] Figure 3 When the magnetic pole of the magnet is aligned with the middle of the two magnetic circuits, the magnetic force line outside the magnet passes through the magnetic circuit completely, the attraction of the magnet to the magnetic circuit is maximum, and the magnetic circuit stops rotating.

[0014] Figure 4 When the magnet and the magnetic circuit are in the intermediate position between the unsmooth and smooth positions, in the case that the magnet is fixed, the magnetic circuit will repel the unsmooth position of the magnetic circuit and rotate to the smooth position of the magnetic circuit, and at this time the torque is maximum.

[0015] The following figure Figures 5 to 8 is the basic structure and recommended design scheme of the non-permanent magnetic circuit motor; the soft magnetic material is represented by the sea blue, the red and blue represent the strength and direction of the electromagnet, and the green represents the non-ferromagnetic material;

[0016] Figure 5 The figure shows the position of the electromagnetic and the magnetic circuit of the three-phase outer magnetic circuit two-pole motor rotated by 90 degrees; the middle electromagnetic is composed of an excitation coil and an iron core, and the coil is hidden, and the outside is two independent magnetic circuits, which are fixed by non-ferromagnetic material. Figure 6 The figure shows two design schemes of the six-pole inner magnetic circuit motor; the left figure is the standard six independent magnetic circuits, and the right figure is that three magnetic circuits between phases are connected together; Figure 7 It is a recommended replacement rotor design scheme of the motor of the new energy vehicle. Figure 8 It is the magnetic circuit punching sheet of the four-stage inner magnetic circuit motor. 1. The most basic non-permanent magnetic circuit motor, three-phase six-slot two-pole

two-way

electromagnetic and magnetic circuit relative rotation always has a magnetic circuit open position and a magnetic circuit non-passing position

Claims

1. Non-permanent magnet motor, a motor with a new driving principle, characterized by: It consists of two parts: the electromagnet and the magnetic circuit; the electromagnet is composed of a coil and an iron core; the magnetic circuit is made of soft magnetic materials, the number of magnetic circuits is equal to the number of electromagnetic poles, there is a certain gap between adjacent magnetic circuits, and they are fixed into a whole with non-ferromagnetic materials.

2. The standard magnetic circuit structure is that each magnetic circuit is independent and is spliced ​​into a whole by snaps and non-ferromagnetic materials, as shown in the left figure of Figure 6; since the magnetic flux directions of the phases are the same, the magnetic circuits between phases can be a whole, as shown in the right figure of Figure 6.

3. In order to reduce production costs, magnetic bridges can be used to connect the magnetic circuits, as shown in Figure 8.

Images