Automatic door brushless motor resistance-encountering discrimination detecting technique

The invention discloses a discrimination technique used for discriminating a block happened to a brushless motor of an automatic door. The inspection technique is based on a theory that an impulse of a rotor is fed back by a Hall sensor in a motor to a DSP port of a main controller for a digital memory and quantitative analysis; the DSP of the main controller judges whether a blocking happens according to an emergence of the motor position impulses; an application of the main controller DSP soft technique is realized. The invention has the advantages that the controlling is accurate and prompt; a set of electronic circuit, an amplifying circuit and a sampling resistance, etc. used for checking motor current flowing are displaced on a hardware part; not only can the cost be reduced with a low energy cost but also the motor is not heated; the starting-stopping and breaking speed is prompt, accurate, reliable and stable; a new approach that the main controller DSP soft technique is used for controlling when a br