Undifferentiated DC 3-phase brushless motor

Abstract

The DC three-phase brushless motor was experiencing uneven rotation because the drive circuit supplied power to only one set of rotational components. This invention aims to eliminate this issue and provide a motor with stable rotational balance. [Solution] The circumference is divided into equal parts, and the number of rotational configurations (6) corresponding to the number of divisions are installed independently. For power supply, the three transistor output lines (7) of one drive circuit and the electromagnet coil lines (11) that require the same amount of power are wired in parallel (Figure 6) and then wired in series. A key feature is that multiple rotational configurations (6) are installed in one motor and powered simultaneously.

Description

Technical Field

[0001] This invention relates to a method for eliminating the bias in the rotational force of a DC three-phase brushless motor.

Background Art

[0002] Conventionally, the rotational force of a DC three-phase brushless motor has been generated with a bias.

Summary of the Invention

Problems to be Solved by the Invention

[0003] This had the following drawbacks. When a DC three-phase brushless motor is energized, only two of the three phases that are switched internally function, and the rotational force is generated with a bias, and only unbalanced rotation can be achieved. This invention has been made to eliminate the above-mentioned drawbacks.

Means for Solving the Problems

[0004] The rotor of a DC three-phase brushless motor (Fig. 1) is composed of a permanent magnet (2), and one polarity on the outer peripheral surface is composed of a N pole and a S pole. The number of magnetic poles is referred to as the number of poles. The number of poles is an even multiple. It is fixed to the outer periphery of the rotor. The stator is composed of an electromagnetic coil (3) and is fixed to the inner periphery of a yoke or a fixed ring (13). The number of stators is referred to as the number of phases. One phase does not necessarily mean one electromagnetic coil. The total number of electromagnetic coils is a multiple of the number of phases. The ratio of the number of poles to the number of phases is made not to be an integer. The magnetic structure constructed by the permanent magnet structure (4) of the rotor and the electromagnetic coil structure (5) of the stator is taken as the rotational structure (Fig. 3). The DC three-phase brushless motor (Fig. 1) rotates a set of rotational structures (Fig. 3) installed at 360° around the circumference by energizing a drive circuit (Fig. 4), but when energized, only two of the three phases that are switched internally have a rotational function.

[0005] Therefore, if the circumference of 360° is divided equally, and the same rotation configuration (Figure 3) is independently installed in each of the divisions and energized simultaneously, the phases corresponding to the dead points will remain relative to each other, but the balance will be achieved and the problem will be solved. However, even if the drive circuit (Figure 4) of the motor configuration (Figure 1) is used as is, the Hall IC (9) cannot be energized because the angle is set. Therefore, if a new drive circuit (Figure 4) can be made that can rotate one set of rotation configurations (Figure 3) in each of the equally divided divisions, the problem can be solved by independently installing the rotation configurations (Figure 3) for each division and energizing them simultaneously. We will explain assuming that such a drive circuit can be made. The method of simultaneous energization is to wire in parallel the coils of the independently installed electromagnet configurations (3) for each division that require the same energization, and wire them in series with the wiring of the transistor output line (7) of the new drive circuit (Figure 4) that requires the same energization. The unbalanced rotation is solved by dividing the circumference equally, independently installing the same rotation configurations (Figure 3) for each division, and energizing them simultaneously. Using this method, one phase corresponding to a dead point where no power is supplied can be ignored.

[0006] The invention described in claim 1 is a DC three-phase brushless motor, wherein the rotor of the motor is composed of a plurality of permanent magnets, one of which has an outer surface composed of an N pole and an S pole, and the total number of the permanent magnets is a multiple of 2, the stator is composed of electromagnet coils, the total number of the electromagnet coils is a multiple of the number of phases, and the ratio of the total number of permanent magnets to the total number of electromagnet coils is not an integer, and the rotor and the stator are constructed to form two magnet configurations, the permanent magnet configuration being installed at equal intervals on the outer circumference of the rotating body and the electromagnet coil configuration being installed at equal intervals on the inner circumference of the yoke or fixed ring, the circumference of the yoke or fixed ring is equally divided and the rotation configuration is independently installed in each of the divided sections, and the rotation force is balanced by simultaneous energization, thus forming an unbiased DC three-phase brushless motor.

[0007] The invention described in claim 2 is an unbiased DC 3-brushless motor as described in claim 1, wherein the simultaneous energization is configured such that the rotation configuration is independently installed in each of the equally divided sections, and when each phase has multiple stators, the coil winding direction of the stators is the same, the rotor side for magnetic pole detection has the coil winding ends for 3 phases wired in parallel on a single wire, the power transmission side of the drive circuit has the coil winding ends for each phase wired in parallel and wired in series with the transistor output line of the drive circuit in accordance with the energization order, the wiring of each stator in the equally divided section that requires the same energization is wired in parallel, and the simultaneous energization of the rotation configuration of all of the equally divided sections is achieved by energizing one set of the rotation configurations. [Effects of the Invention]

[0008] By providing multiple independent rotational configurations (Figure 3) equal to the number of divisions around the circumference and energizing them simultaneously, unbalanced rotational conditions are eliminated, making it possible to create large motors that generate powerful rotational force with balanced rotation. Balanced rotation is extremely important for rotating bodies. [Brief explanation of the drawing]

[0009] [Figure 1] This is a diagram showing the internal structure of the DC three-phase brushless motor that formed the basis of this invention. [Figure 2] This diagram shows the motor that formed the basis of this invention in a straightened state. [Figure 3] This is an illustrative diagram of an 8-pole, 6-coil rotating configuration of the present invention. [Figure 4] This is a diagram of the drive circuit used in the present invention. [Figure 5] This is a diagram illustrating an example of the installation of the four-part rotating configuration of the present invention. [Figure 6] This is a wiring diagram for two sections of the four-part wiring configuration for the independently rotating power supply wiring of the present invention. [Figure 7] This is a diagram showing the rotational configuration and installation of the divided sections of the present invention. [Modes for carrying out the invention]

[0010] The following describes embodiments for carrying out the present invention. As mentioned above, the rotating configuration (Figure 3) is a magnetic configuration with a rotating function, constructed from a rotor's permanent magnet configuration (2) and a stator's electromagnet coil configuration (3). The rotor of a brushless motor is composed of permanent magnets (4) and is installed on the outer circumference (12) of the rotating body. The number of magnetic poles is called the number of poles. The polarity of the outer surface consists of N poles and S poles (2). The number of poles is an even multiple. The stator is composed of electromagnet coils (3) and is fixed to the inner circumference of a yoke or fixing ring (13). The number of stators is called the number of phases. Since one phase is not necessarily one electromagnet coil, the total number is a multiple of the number of phases. The ratio of the number of poles to the number of phases should not be an integer. Since there is more than one type of configuration for the number of poles and phases in the rotating configuration (Figure 3), an 8-pole, 6-coil configuration (Figure 6) is used as an example for explanation purposes. Furthermore, the drive circuit (Figure 4) is set up to conduct electricity at angles determined by the magnetic pole sensing Hall IC (9) across the 360° circumference, resulting in a state of uneven rotation. To resolve this, we will explain how to create a drive circuit (Figure 4) by modifying the settings of the Hall IC (9) so that the circumference is treated as being divided into equal sections, and one set of rotational components is energized and rotated in each section.

[0011] Conventional DC 3-phase brushless motors (Figure 1) rotate 360° by switching between 120° and 6 rotations using one set of rotational components (Figure 3) and a drive circuit (Figure 4). However, this structure means that only two of the three phases rotate when energized, resulting in uneven rotational force and unbalanced rotation. To improve and resolve this, the motor circumference is considered to be divided into equal sections (Figure 5), and one set of rotational components (3) is installed in each section. The permanent magnet component (4) is installed on the outer circumference of the rotating body (12), and the electromagnet coil component (5) is installed independently on the yoke or the inside of the fixed ring (13) circumference, and the problem is solved by energizing them simultaneously. For example, if the circumference is divided into four sections, 90° becomes one section, and the rotational components are configured to rotate at this angle. Since there are three phases within this 90° angle, 30° of the circuit is energized. The simultaneous energization method involves wiring the coils (Figure 6) requiring the same current in parallel using independent electromagnet configurations (5) for each division, and then wiring them in series with the three transistor output lines (7) of the drive circuit (Figure 4) that require the same current. Since parallel wiring does not change the operating voltage, the same voltage can be used for all coils. In this way, the rotational force generation points are evenly distributed across the entire rotor, resulting in balanced rotation, and the electromagnet coil (3) corresponding to the dead point of one phase that is not energized can be ignored because it is equally divided. If we consider the method illustrated, the result will be 32 poles, 12 phases, and 24 coils in 4 divisions.

[0012] If ferromagnetic rare metal permanent magnets are used as components, power consumption can be reduced, and their size and shape can be manufactured as desired. The magnet mounting components will be made of electromagnetic steel sheets to construct the magnetic pole circuit. The fixing method will involve adhesive and bolt fastening to prevent delamination. For the electromagnet, a laminated electromagnetic steel sheet core will be used for the coil winding core to counter eddy currents. The fixing part will also be made of the same steel sheet and secured with bolts. The coil winding method will be bipolar driven monofilar winding, with all coils wound in the same direction and the same number of turns. The air gap will be kept as small as possible so that the rotor (2) and stator (3) do not come into contact during rotation. The present invention has the configuration described above. [Explanation of Symbols]

[0013] 1 DC 3-phase brushless motor 2 permanent magnets 3. Electromagnet coil 4. Permanent magnet configuration 5. Electromagnet coil configuration Wiring diagram for 2 of the 4 divisions of the 8-pole, 3-phase, 6-coil 6-rotation configuration. 7. Drive circuit transistor output line 8-hole IC output line 9 Hole IC 10 Drive circuit 11 Electromagnet coil wire 12. Solids of revolution 13 Yoke, fixing ring 14. Installation diagram of the four-part rotating configuration of the present invention

Claims

1. A DC three-phase brushless motor, wherein the rotor of this motor is composed of multiple permanent magnets, one of which has an outer surface composed of a north pole and a south pole, and the total number of the permanent magnets is a multiple of two, the stator is composed of electromagnet coils, the total number of the electromagnet coils is a multiple of the number of phases, and the ratio of the total number of permanent magnets to the total number of electromagnet coils is not an integer, and the rotor and the stator are constructed to form two magnet configurations, with the permanent magnet configuration being installed at equal intervals on the outer circumference of the rotating body and the electromagnet coil configuration being installed at equal intervals on the inner circumference of the yoke or fixed ring, forming a set of rotating mechanisms, the circumference of the yoke or fixed ring is equally divided, and the rotating configuration is independently installed in each of the divided sections, and the rotational force is balanced by simultaneous energization, thus forming an unbiased rotating DC three-phase brushless motor.

2. The simultaneous energization is configured such that the rotation configuration is independently installed in each of the equally divided sections, and when each phase has multiple stators, the coil winding direction of the stators is the same, the rotor side for magnetic pole detection has the coil winding ends for three phases wired in parallel on a single wire, the power transmission side of the drive circuit has the coil winding ends for each phase wired in parallel and wired in series with the transistor output line of the drive circuit in accordance with the energization sequence, the wiring of each stator in each equally divided section that requires the same energization is wired in parallel, and the simultaneous energization of the rotation configuration of all equally divided sections is achieved by energizing one set of the rotation configurations, as described in claim 1.

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