초록 ▼

An electronically commutated motor (4) has a permanent-magnet rotor (28) and has a stator (14) that has two winding phases (25, 26). During one rotor rotation of 360.degree. el., firstly current is delivered to the one winding phase (25) within a first rotation angle range via an associated first se

An electronically commutated motor (4) has a permanent-magnet rotor (28) and has a stator (14) that has two winding phases (25, 26). During one rotor rotation of 360.degree. el., firstly current is delivered to the one winding phase (25) within a first rotation angle range via an associated first semiconductor switch (68); and within a subsequent second rotation angle range, current is delivered to the other winding phase (26) via an associated second semiconductor switch (70). The motor further has a commutation apparatus for alternatingly switching ON the first semiconductor switch (68) and the second semiconductor switch (70). This commutation apparatus comprises a bistable multivibrator (FF90) whose switching state is controlled, via at least one comparator (126, 128), by the voltage that is induced by the permanent-magnet rotor (28) in that winding phase (25 or 26) which is currentless at that instant and which, in the instantaneous rotation angle range of the rotor (28), is not being supplied with current via its associated semiconductor switch (68 or 70).

대표청구항 ▼

1. An electronically commutated motor (4) comprising:a permanent-magnet rotor (28); a stator (14) having two winding phases (25, 26), of which, during one rotor rotation of 360.degree. el., firstly current is delivered to a first one (25) of said winding phases within a first rotation angle range vi

1. An electronically commutated motor (4) comprising:a permanent-magnet rotor (28); a stator (14) having two winding phases (25, 26), of which, during one rotor rotation of 360.degree. el., firstly current is delivered to a first one (25) of said winding phases within a first rotation angle range via an associated first semiconductor switch (68), and within a subsequent second rotation angle range, current is delivered to the other (26) of said winding phases via an associated second semiconductor switch (70); a commutation apparatus for alternately switching on the first semiconductor switch (68) and the second semiconductor switch (70), which comprises a bistable multivibrator (FF90) whose switching state is controlled, via at least one comparator (126, 128), by a voltage that is induced by the permanent-magnet rotor (28) in that winding phase (25 or 26) which, in the instantaneous rotation angle region of the rotor (28), is not being supplied with current via its associated semiconductor switch (68 or 70).