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Pulse-controlled electronically commutated motor

  • US 6,741,048 B2
  • Filed: 09/26/2002
  • Issued: 05/25/2004
  • Est. Priority Date: 09/26/2001
  • Status: Expired due to Fees
First Claim
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1. An electronically commutated motor (1) comprising P phases and N pairs of poles, said motor comprising:

  • a rotor (2) having the N pairs of poles and a stator (3) having P coils formed respectively from a phase winding, said rotor (2) being mounted able to rotate inside the stator (3) by means of at least one anti-friction bearing (5, 6), said anti-friction bearing (5, 6) comprising a fixed ring (5b, 6b) and a rotating ring (5a, 6a) associated with the rotor (2); and

    a device for controlling the commutation of the current between the phases of the motor (1);

    said motor (1) being characterised in that;

    a circular multipole encoder (12) is associated with the rotating ring (6a) of an anti-friction bearing (6), said encoder (12) comprising a main multipole track (12a) and a multipole commutation track (12b) comprising 2*P*N singularities (12b1-12b6) equidistributed angularly, the main (12a) and commutation (12b) tracks being concentric on the encoder (12); and

    the control device comprises;

    a fixed sensor (15) disposed opposite and at air gap distance from the encoder (12), said sensor (15) comprising at least three sensing elements, at least two of which are positioned opposite the main track (12a) so as to deliver square digital signals A, B in quadrature, and at least one of which is positioned opposite the commutation track (12b) so as to deliver a signal C in the form of 2*P*N pulses per revolution of the encoder (12);

    a circuit for commutating (20) the currents in the phase windings of the motor (1) having 2*P*N switches (T1-T6);

    a control circuit (21) for the commutation circuit (20) which;

    from the signal C supplies commutation signals for the switches (T1-T6); and

    from the signals A, B and according to a first current set point (I*) defines a second current set point (Iref) which controls the current (Im) supplying the phase windings of the motor (1).

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