Motor control circuit and method as well as brushless motor system
A motor control and circuit technology, applied in the field of motor control circuits, brushless motor systems, and motor control methods, can solve the problems of inconvenience, general products and methods without suitable structures and methods, etc.
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[0088] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, in conjunction with the accompanying drawings and preferred embodiments, the specific implementation methods, Structure, method, step, feature and effect thereof are as follows in detail.
[0089] In order to solve the problems of the prior art, the present invention provides a rotor position detection method, a motor controller and a brushless motor. Before explaining the method and device, the back electromotive force closely related to the position of the motor is analyzed. The following will take the three-phase motor shown in Figure 2 as an example, and analyze it mathematically and electronically.
[0090] First, assume that the equivalent series resistance R of the stator coils 11-13 s is a fixed value, and it is assumed that the inductance L of the stator coils 11-13 s equal. Therefore, the voltage v at nodes A, B, and C of t...
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