KR890003422Y1 - Brushless dc motor - Google Patents

Abstract

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Description

Rectifierless DC Motor Drive Circuit

1 is a circuit diagram of the present invention.

2 is an output waveform diagram of each part according to the present invention.

3 is a cross-sectional view of the motor according to the present invention, an illustration of possible rotor positions.

* Explanation of symbols for main parts of the drawings

A: Mobile unit B: First delay unit

C: second delay part D, M: photo coupler

A ₁ , A ₂ : end gate I ₁ : inverter

Q ₁ -Q ₃ : Transistor PD ₁ -PD ₂ : Photodiode

PT ₁ -PT ₂ : Phototransistor D ₁ : Diode

R ₁ -R ₈ : Resistor C ₁ -C ₃ : Capacitor

1: Position detecting element 2, 2 ': Field winding

3, 3 ': field 4: rotor

5: Mobile magnet

The present invention relates to a starting and operating circuit of a direct current rectifier motor, in particular a two-phase two-pole rectifier motor.

In the conventional two-phase non-commutator motor, there is a dead point, so there is a risk of stopping at this dead point where no torque is generated when the motor is started or under friction load. When the torque is generated low because the positional relationship between the rotor and the rotor is ambiguous, the counter electromotive force is small, so that the current flows excessively, resulting in a large copper loss.

In order to solve such a problem, a method of eliminating dead points using a spatial harmonic magnetic field has been adopted in recent years, but in this case, auxiliary permanent magnets, which are twice the number of poles, must be installed in the rotor. Since the auxiliary permanent magnet had to be installed, the structure was complicated and had economic problems.

In view of the above, the present invention has been designed to properly set the positions of the starting magnet and the position detecting element on the motor, and to further eliminate the problem of starting the motor by adding the starting circuit.

Referring to the configuration of the present invention by the accompanying drawings as follows.

In FIG. 1, the emitter connects the diode D ₁ and the resistor R ₁ in parallel between the base and the emitter of the transistor Q ₁ connected to the power supply Vcc, and the resistor R to the base. ₂ ), (R ₁ ) and condenser (C ₁ ) are connected in series, and the other side of the position detector (1) having one side connected to the power supply (Vcc) and the collector of the transistor (Q ₁ ) in common and the AND gate The first delay part ( _b ) consisting of (A ₁ ), resistor (R ₃ ) and capacitor (C ₂ ) is connected to photodiode (PD ₁ ) via resistor (R ₅ ), and inverter (I ₁ ), end A _second delay portion (C) consisting of a gate (A ₂ ), a resistor (R ₄ ), and a capacitor (C ₃ ) is connected to the photodiode (PD ₂ ) through a resistor (R ₈ ), and the collector side has each field winding (2) Between the collector and base of each of the transistors Q ₂ and Q ₃ connected to (2 '), the photo transistor PT ₁ , the resistor R ₆ and the series transistor photo transistor ( PT ₂ ) and resistor R ₇ do.

In addition, the movable magnet 5 is fixed to the center upper end of the field winding 2 and the field winding 2 'of FIG. 3, and the position detecting element 1 is fixed at the position which forms the space angle (alpha). do.

Referring to the effects of the present invention configured in this way in detail as follows.

FIG. 3 shows the positions of possible rotors before powering on the motor. The scope of FIG. 3 (a) (b) (c) of FIG. 3 of the position of the rotor 4 by the starting magnet 5 is shown in FIG. The position detecting element 1 outputs a high level signal when the S pole of the rotor 4 is detected.

On the other hand, when the power is supplied to each terminal (Vcc) and (Vs) of Figure ₁ , the capacitor (C ₁ ) is charged through the resistor (R ₁ ) and the resistor (R ₂ ), so the voltage across the resistor (R ₁ ) A difference is generated and transistor Q ₁ is turned on.

Therefore, a high level signal appears on the collector side, which is a photodiode of the photocoupler (la) after a delay time (t) by the resistor (R ₃ ) and the capacitor (C ₂ ) of the first delay part ( _b ). Since PD ₁ emits light, its phototransistor PT ₁ and transistor Q ₂ are turned on to excite the field winding 2.

At this time, when charging of the capacitor C ₁ of the movable part A is completed, the transistor Q ₁ is turned off, so that the low-level signal on the collector side thereof is transmitted through the inverter I ₁ of the second delay part C. It is converted into a high-level signal and applied to the photodiode PD ₂ of the photo coupler (e) after a predetermined delay time t by the resistor R ₄ and the capacitor C ₃ , so that the photo of the photo coupler (e) The transistors PT ₂ and Q ₃ are turned on to excite the field winding 2 ′.

In this manner, after the field windings 2 (2 ') are alternately excited in accordance with the output level of the starting section (a) to start the rotor (4) in FIG. 3, the rotation is performed in accordance with the output of the position detecting element (1). The rotation fork is generated in the electron 4, and when the position detecting device 1 of FIG. 3 detects the S pole of the rotor 4, the first delay part (b) and Since the field winding 2 is excited through the photo coupler, the position detecting element 1 detects the N pole of the rotor 4 and outputs a low level signal. (C) and the field winding 2 'are excited through the photocoupler (e), and the rotor 4 rotates in the direction of the arrow.

At this time, the position detecting element 1 is positioned so as to be advanced by the space angle α from the starting magnet 5, so that the switching point between the phases of the field when the rotor 4 rotates is rotated by the rotational stimulus and the angle α. Continuous rotational torque can be obtained by having a phase difference of. In each of the first and second delay parts (b and c), as shown in FIG. 2, the starting part (a) or the position detecting device 1 of FIG. Delays the output signal by a time t to prevent the transistors Q ₂ and Q ₃ from being turned on at the same time. The photocoupler (la, e) is a power supply (Vcc) and a motor power ( Vs) is to electrically separate the family.

On the other hand, the diode (D _1), is a bypass diode for preventing after Motor start voltage that is charged in the capacitor (C ₁₎ is reverse-biased to the transistor (Q ₁₎ is a transistor (Q ₁₎ fracture.

The present invention acting in this way is a simple and economical configuration, which eliminates the inability to start due to dead points when starting the motor, and prevents the destruction of the motor due to copper damage. By completely separating the electrical, it is possible to exclude the influence of interference due to the mutual power supply, there is an effect to prevent the malfunction of the motor by each delay unit.

Claims (1)

In a two-phase two-pole non-rectifier motor driving circuit, an output terminal and a position detecting element (1) of a starter (A) composed of a transistor (Q ₁ ), a diode (D ₁ ), a resistor (R ₁ , R ₂ ), and a capacitor (1) ) And the output terminal of () are connected in common to the photodiode (PD ₁ ) through the first delay portion (B) composed of the AND gate (A ₁ ), resistor (R ₃ ), capacitor (C ₂ ), and inverter (I) ₁ ) is connected to the photodiode PD ₂ via a second delay portion (C) consisting of an AND gate (A ₂ ), a resistor (R ₄ ), and a capacitor (C ₃ ), and the collector side is connected to each field winding ( 2) Photo transistors PT ₁ and PT ₂ are connected between the collector and base of each of the transistors Q ₂ and Q ₃ connected to (2 '), respectively. 2) A non-commutator DC motor driving circuit, characterized in that the movable magnet 5 is fixed between (2 '), and the position detecting element 1 is fixed at a position at which the space angle α is obtained. .