KR100359566B1 - The fabrication of the rotor yoke for the single phase driving type BLDC Motor - Google Patents

Abstract

The present invention relates to a rotor magnetization structure of a single-phase drive type BLDC motor, and in the case of the single-phase drive type, there must be an imbalance between the magnetic pole detection and the force caused by a Hall sensor during switching, in particular, at initial startup. In consideration of the fact that the rotor is driven without dead point wherever the rotor is located, the surface magnetic flux density is increased by forming a pole separation groove at the dead point of the rotor magnet which is formed in the stator. Since the dead point can be removed by the asymmetrical configuration, it has the same characteristics as the three-phase driving type motor and at the same time has the effect of maximizing the starting characteristics of the single-phase driving type BLDC motor.

Description

Rotor magnetization structure of single phase drive type DC motor {The fabrication of the rotor yoke for the single phase driving type MSC motor}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor magnetization structure of a single-phase drive type BLDC motor, and a rotor magnetization structure in order to suppress dead point generation that may occur structurally in a BLDC motor having a single phase drive type. The rotor magnetizing structure of a single-phase drive type BLDC motor configured to have an asymmetric surface magnetic flux density.

Dead point refers to any one or several points at which the rotor of the motor does not perform normal switching operation when the rotor rotates. ) Motor, the motor is not started even if the power is on.

The rotor yoke structure of the conventional BLDC motor is as shown in FIGS. 1 and 2, and a portion corresponding to the outer circumference of the rotating surface of the magnet 2 attached to the surface of the rotor 1 is provided. It has a larger diameter than the outermost outer diameter of the magnet 2 and is equally spaced from the outer periphery of the magnet 2, so that one imaginary line passing through the center of rotation of the rotor 1 is symmetrical to each other. It has a structure of a magnet (3) in the form of two slots separated.

1 is a single-phase driving system in which the magnet 2 is formed in a cylindrical shape on the entire surface of the rotor 1, and the surface magnetic flux density is symmetrical.

On the contrary, the configuration of FIG. 2 is a three-phase driving method in which three magnets 2 are formed on the surface of the rotor 1 with a symmetrical angle of 120 °, and a partial magnetic flux at the joints of three magnets 2 is shown. Due to the reduction, the surface magnetic flux density becomes asymmetrical.

In the three-phase driving method shown in FIG. 2, the magnetic pole detecting element (not shown) detects any one of the N and S poles and generates an output signal regardless of the position of the magnet 2. Rotate 1).

However, in the three-phase driving method, three magnets (2) are attached to the rotor (1) and then two slot (3) magnets (3) are attached, thereby increasing the price, decreasing reliability due to electrodeposition, and increasing work processes. There have been various problems.

On the other hand, in the case of the single-phase drive system shown in Figure 1 is less economical than the three-phase drive system shown in FIG. Since the intervals between the rotors 1 are equally spaced, the N and S-pole configurations are equally multiplied and necessarily have one or more dead points.

That is, when the N and S pole separation points of the magnet 2 are located at the center of the magnetic pole detection element (not shown) and the magnetic pole detection element simultaneously detects both the N and S poles, the output signal cannot be sent to the rotor 1. There was a problem that does not rotate.

The present invention has been made to solve the above-mentioned conventional problems, and in the case of the single-phase driving method, the stimulus detection and the power imbalance by the stimulus detection element (Hall Sensor) at the time of switching, in particular, the initial start-up, In view of the fact that the rotor can be driven without any dead point, the rotor yoke structure formed on the stator is designed so that the surface magnetic flux density is asymmetric, thereby eliminating the dead point. It is an object of the present invention to provide a rotor magnetizing structure of a single phase drive BLDC motor capable of maximizing the starting characteristics of a single phase drive BLDC motor at a lower cost.

1 is a cross-sectional view of a magnetizing structure of a conventional single phase drive BLDC motor;

2 is a cross-sectional view of a magnetizing structure of a conventional three-phase drive type BLDC motor.

Figure 3 is a cross-sectional view of the magnetizing structure of the present invention

<Description of the symbols for the main parts of the drawings>

1: rotor 2: magnet

3: magnetization 4: pole separation groove

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration and operation of the present invention.

3 is a cross-sectional view of the magnetizing structure of the present invention, in which a rotor yoke structure of the single-phase drive type BLDC motor according to the present invention corresponds to the outer circumference of the rotating surface of the magnet 2 attached to the rotor 1. The part having a larger diameter than the outermost outer diameter of the magnet 2 and at the same distance from the outer periphery of the magnet 2, but having one imaginary line passing through the center of rotation of the rotor 1 as a symmetry line The polarization groove 4 is formed at a dead point occurrence position in the two-slot magnetized structure 3 formed so as to be symmetrical so that the surface magnetic flux density is asymmetric.

At this time, the winding direction of the coil that determines the direction of the magnetic poles in the magnetizer 3 is wound in the same direction for each of the two slot stators separated so that the magnetic poles formed on the magnets 3 in each stator are the same. do.

By the configuration as described above, the surface magnetic flux density is lowered at the portion where the polar separation grooves 4 are formed to form an asymmetric structure. When the number of slots is N and the number of magnet poles is P, the conventional single phase In the case of the drive type BLDC motor, N = P, whereas in the present invention, N = 2P, so that the number of magnetized poles is twice the number of slots.

Therefore, the dead point is eliminated so that the signal is smoothly transferred to the switching transistor after the rotor N and S poles are detected by the magnetic sensor (Hall Sensor, not shown) during initial start-up and operation of the motor. Improve the maneuverability of

The effect obtained by the present invention having the configuration and operation characteristics as described above can be economically useful because it obtains the same characteristic effects as the three-phase driving method and at the same time has a lower cost and shorter process compared to the three-phase driving method. In addition, the productivity and reliability can be improved.

Claims (1)

The part corresponding to the outer circumference of the rotating surface of the magnet 2 attached to the rotor 1 has a larger diameter than the outermost outer diameter of the magnet 2 and at the same interval as the outer circumference of the magnet 2, but the rotor 1 Polar separation groove 4 is formed at the position of dead point in the two-slot magnetized structure 3 formed so as to be symmetrical with one imaginary line passing through the center of rotation as a symmetry line. Rotor magnet structure of a single-phase drive type BLDC motor, characterized in that the surface magnetic flux density is asymmetrical.