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Control method and control circuit for brushless DC motor

A technology of DC motor and control method, which is applied in excitation or armature current control, control system, electronic commutation motor control, etc., can solve the problems of reducing winding installation space and complex motor structure, etc.

Inactive Publication Date: 2008-09-17
DELTA ELECTRONICS INC
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Problems solved by technology

[0010] The idea of ​​the present invention is to propose a unidirectional brushless DC motor without the use of a Hall effect detector and its control method and control circuit, which can improve the vulnerability of the environment when the Hall effect detector is used to control the motor in the traditional technology. The problem of the influence of (temperature) changes, and the problem of complicating the motor structure and reducing the installation space of the winding when the detection coil is used instead of the Hall effect detector

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  • Control method and control circuit for brushless DC motor
  • Control method and control circuit for brushless DC motor
  • Control method and control circuit for brushless DC motor

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Embodiment Construction

[0067] The control method of the unidirectional brushless DC motor proposed by the present invention does not need to use the Hall effect detector. A control circuit is arranged on the H-bridge (H-bridge) of the stator structure of the motor, and based on the so-called motor winding timing Multiplexing (motor winding time-sharing) technology for control. That is to say, using the controller to control the inverter (inverter), when the absolute value of the back electromotive force is extremely large, inject a load current in the motor winding in the same direction as the back electromotive force, so that the motor winding becomes a driving element; and when The absolute value of the back electromotive force is extremely small, so that the motor winding has almost no current and becomes a detection element. At this time, the controller continuously adjusts the time length of the motor winding as the driving element according to the detected back electromotive force information a...

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Abstract

A method for controlling brushless DC motor includes using controller to drive current to flow through motor winding for generating driving torque to make motor rotate when motor winding is used as driving element in major time of half counter electromotive force period, using motor winding as detection element in minor time of said period and controlling current in motor winding to be zero by controller to let motor rotate by inertia, using winding end voltage as motor counter electromotive force to regulate pulse width of driving current in next half counter electromotive force period for finalizing motor commutation.

Description

technical field [0001] The present invention refers to a control method and a control circuit of a brushless DC motor, especially a single-phase brushless DC motor (brushless DC motor) that does not need to use a Hall-effect sensor. BLDCM) control method and control circuit. Background technique [0002] The single-phase brushless DC motor must pass a current commutation signal synchronized with the position of the rotor to maintain normal operation. In most applications, a Hall effect detector will be used in the motor to detect The position of the rotor. [0003] The Hall effect detector itself has the disadvantage of being extremely susceptible to temperature changes and affecting the performance of the components. Therefore, applying it to the motor will also make the system using the motor less capable of performing in terms of environmental changes (especially temperature changes) It is expected, in addition, that the use of Hall effect detectors within the motor als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/00H02P7/06H02P6/182
Inventor 王微子吴志敢金万兵应建平黄世民黄文喜
Owner DELTA ELECTRONICS INC
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