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Brushless DC motor driver

A driving device and circuit technology, applied in the direction of electronic commutation motor control, single motor speed/torque control, electrical components, etc., can solve problems such as motor efficiency decline and noise, and achieve the effect of simple structure

Inactive Publication Date: 2005-11-02
NIDEC SHIBAURA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the reference potential is the same as that of a drive device having a position detection element. Since the reference potential is fixed, the lead angle is also fixed, and there is a problem that the motor efficiency decreases and noise is generated at speeds other than the speed corresponding to the lead angle.

Method used

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  • Brushless DC motor driver
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  • Brushless DC motor driver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] Below, according to figure 1 with figure 2 The drive device 12 of the brushless DC motor (hereinafter, simply referred to as a motor) 10 according to Embodiment 1 of the present invention will be described.

[0029] The motor 10 is a three-phase brushless DC motor having a U-phase, V-phase, and W-phase star-shaped stator coils 14 connected, and the motor 10 is a driving source of a fan device.

[0030] (1) Configuration of drive device 12

[0031] according to figure 1 The configuration of the drive device 12 will be described.

[0032] The driving device 12 is composed of an inverter circuit 16, a control unit 18 composed of a microcomputer, a PWM control circuit 20, a triangular wave oscillation circuit 22, an energization signal forming circuit 24, an upper arm driving circuit 26, a lower arm driving circuit 28, an overcurrent detection circuit 30, The lead angle control circuit 32, the position detection circuit 34, and the timing control circuit 23 are composed.

[...

Embodiment approach 2

[0061] according to image 3 The drive device 12 of the second embodiment will be described.

[0062] In the first embodiment, the voltage between the terminals of each phase is compared with the lead angle reference potential. In the case of this embodiment, as image 3 As shown, the neutral point voltage and the lead angle reference potential are compared by combining the voltages between the terminals of each phase into one.

[0063] Specifically, the other ends of the resistance elements R1 to R3 connected to the stator coils of each phase are connected, and are connected to the positive terminal of the comparator 46 via the resistance element R5. The negative terminal of the comparator 46 is connected to the other end of the variable resistance element 44. In addition, the output terminal of the comparator 46 is connected to the position detection circuit 34 to output the synthesized phase signal.

[0064] Even in the drive device 12 of the present embodiment, as in the first e...

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PUM

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Abstract

The present invention provided a brushless DC motor drive capable of performing optimal lead angle control. An overcurrent detection circuit 30 detects the value of a load current flowing into an inverter circuit 16. A lead angle reference potential is outputted while being increased when the value of the load current detected by the overcurrent detection circuit 30 decreases, and outputted while being decreased when the value of the detected load current increases. A lead angle control circuit 32 generates a phase signal at the cross timing of the voltage between terminals of the stator winding 14 of each phase of a brushless DC motor 10 and the lead angle reference potential. A position detection circuit 34 generates a position detection signal based on that phase signal.

Description

Technical field [0001] The present invention relates to a sensorless drive device of a brushless DC motor that can perform advanced color control. Background technique [0002] In order to detect the position of the rotor of a brushless DC motor (hereinafter, simply referred to as a motor), a position detection element such as a Hall IC or a Hall element is installed around the rotor (for example, refer to Patent Document 1). [0003] The optimal installation position of the position detecting element differs depending on the influence of armature reaction and the like and load current. Therefore, in the conventional motor, the position detection element is moved to an optimal position according to the load used in advance, and is mounted on the wiring board. [0004] However, when the phase angle deviates from the point of use, the phase delay or advance occurs, and the motor generates noise and the efficiency of the motor deteriorates. [0005] Especially in the motor used in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18H02P6/06H02P6/08H02P6/15H02P6/17H02P6/182
CPCF28D9/005F28D9/0093F28D2021/0024F28D2021/0035F28F3/00F28F9/0246
Inventor 畑山敬之
Owner NIDEC SHIBAURA CORP