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Single-phase brushless DC motor drive circuit

A technology of DC motor and drive circuit, applied in the direction of single-phase motor control, single motor speed/torque control, electrical components, etc., can solve problems such as difficulty in generating starting torque

Inactive Publication Date: 2010-01-27
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But with the prior art configuration described above, it is difficult to generate starting torque when starting the motor in the forward or direction
Another problem is that the starting direction must be determined

Method used

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  • Single-phase brushless DC motor drive circuit
  • Single-phase brushless DC motor drive circuit
  • Single-phase brushless DC motor drive circuit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0025] figure 1 is a schematic sectional view showing the structure of a single-phase brushless DC motor and the configuration of a magnetic sensor (or magnetic pole position detector) to which the motor drive circuit according to the present invention is applicable. The motor structure and the sensor arrangement are not limited to the examples described, but can be appropriately changed.

[0026] refer to figure 1 , a single-phase brushless DC motor 1 includes: a rotatable magnetic rotor 2 having a plurality of magnetic poles, a stator core 3 equipped with a plurality of slots 5 and teeth 4a and 4b, and a motor coil 6 fixed in the slots 5, teeth 4a and 4b are arranged facing the magnetic rotor 2 . The motor coil 6 is wound on the teeth 4a and 4b in opposite directions.

[0027] Such as figure 1 As shown, the magnetic pole position detectors for outputting the detection signal indicating the magnetic pole position of the magnetic rotor 2, that is, the magnetic sensor 7 (fi...

no. 2 example

[0067] Next, a drive circuit for driving the single-phase brushless DC motor 1 will be described according to the second embodiment. In the description of the second embodiment, component parts having the same configuration and operational effects as those of the first embodiment are designated by the same reference symbols. The detailed description in this respect in the first embodiment will be incorporated by reference into the second embodiment.

[0068] The configuration of the second embodiment differs from that of the first embodiment in that the magnetic sensor 9 (third magnetic pole position detector) and the timer 15 are crucial in the second embodiment. Another difference is that the selector circuit 12 selects the magnetic sensor according to the rotation direction instruction circuit 11 and the timer 15 . The magnetic sensor 7 (or the first magnetic pole position detector) is selected at the reverse rotation start time to select the magnetic sensor 9 after the st...

no. 3 example

[0081] next reference Figures 1 to 3 with Figure 7 , a drive circuit for driving the single-phase brushless DC motor 1 will be described according to the third embodiment. In the description of the third embodiment, component parts having the same configuration and operational effects as those of the first embodiment are denoted by the same reference symbols. The detailed description in this respect in the first embodiment will be incorporated by reference into the third embodiment.

[0082] The configuration of the third embodiment is different from that of the first embodiment in that the magnetic sensor 10 (the fourth magnetic pole position detector), the sensor selection circuit 16 and the output changing circuit 17 are crucial in the third embodiment of. Another difference is that the selector circuit 12 selects the magnetic sensor under the control of the rotation direction command circuit 11 and the sensor selection circuit 16 . The magnetic sensor 8 (second magne...

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PUM

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Abstract

A motor drive circuit for driving a single-phase brushless DC motor includes a rotatably supported magnet rotor having magnetic poles, a stator core provided with slots and teeth, the teeth being arranged to face the magnet rotor, and a motor coil held in the slots. The single-phase brushless DC motor drive circuit further includes a plurality of magnetic pole position detectors for outputting detection signals indicative of magnetic pole positions of the magnet rotor, a rotation direction instruction circuit for issuing an instruct of a rotation direction of the magnet rotor, a selector circuit for selectively outputting the detection signals of the magnetic pole position detectors, a switching circuit for driving the motor coil and a control circuit for, based on the selectively outputted detection signals from the selector circuit, controlling the switching circuit to thereby control a direction and a magnitude of current flowing through the motor coil.

Description

technical field [0001] The present invention relates to a drive circuit for a reversible single-phase brushless direct current (DC) motor. Background technique [0002] A drive circuit for a single-phase brushless DC motor includes a sensor for detecting a magnetic pole position of a rotor and a motor drive integrated circuit for controlling a switching circuit based on the magnetic pole position detected by the sensor. In the case of using an H-bridge as the switching circuit, the diagonally placed switching circuits are alternately driven to supply bidirectional current to the motor coil. [0003] As a method for rotating a single-phase brushless DC motor in the forward and reverse directions, there is known a method in which an output signal of a Hall sensor for detecting a magnetic pole position is passed through a circuit capable of inverting the output signal or not. The phase-inverting circuit is input into a motor drive integrated circuit (see, for example, Japanese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/22H02K29/06H02K29/08H02K29/03H02P6/06H02P6/08H02P6/26
CPCH02P6/10H02P6/14H02P6/12H02P6/22H02P6/16
Inventor 植田英稔
Owner MATSUSHITA ELECTRIC WORKS LTD