Speed control circuit for permanent magnet D-C motors

Details Speed control circuit for permanent magnet D-C motors Speed control circuit for permanent magnet D-C motors

1974-03-18

1976-01-13

Scott, James R.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, H02K 2902

Patent

active

039327930

ABSTRACT:
To obtain in a brushless d-c motor a speed control signal which is dependent both on rotational speed and on armature current in a predetermined mix, each of n armature winding has a diode connected thereto with one terminal, all terminals of the diodes being connected together to provide a first control voltage which coupled out from the windings during current flow therethrough and is representative of a composite of the emf induced by the field of the rotor in the n armature windings and of resistance voltage drop due to the current flow through the respective armature windings; resistors have one terminal, each, connected to the same n respective armature windings and the other terminals together to provide a common resistor junction at which a second control voltage is derived representative of 1
of the resistance voltage drop due to current flow through said n armature windings. The two control voltages are normalized or weighted with respect to each other, compared, and the comparison is applied to a speed control circuit which will be responsive to armature current and to induced voltages. Positive or negative feedback can be introduced, in dependence on armature current, by affecting the normalization or weighting ratio.

REFERENCES:
patent: 3662237 (1972-05-01), Favre
patent: 3688172 (1972-08-01), Seiber et al.
patent: 3750000 (1973-07-01), Bruckner et al.
patent: 3757185 (1973-09-01), Brunner et al.
patent: 3767986 (1973-10-01), Wada
patent: 3783359 (1974-01-01), Malkiel
patent: 3795849 (1974-03-01), Futagawa et al.

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