Brushless d-c motor system
First Claim
1. Two-pulse, two-filament brushless d-c motor system havinga stator (15);
- d-c current supply means having two terminals (33,35);
a permanent magnet rotor (11);
rotor position sensing means (25) providing an output signal positioned on the stator and sensing a predetermined orientation of a magnet pole of the rotor with respect to the stator;
armature winding means including two winding strands or filaments (20, 21;
20'"'"', 21'"'"') wound on the stator, said winding strands or filaments being inductively coupled;
and control circuit means (42) including controlled semiconductor switch means (57, 58;
69, 75;
80,
81) connected to said winding strands or filaments to control pulsed current flow, alternately, through the respective winding strands or filaments,wherein,said semiconductor switch means are of respectively opposite, complementary conduction characteristics (pnp;
57, 69, 80;
npn;
58, 75,
81);
one terminal (a2) of one winding strand or filament (21, 21'"'"') being connected through the main current carrying path of one of said semiconductor switch means (npn;
58, 75,
81) with one terminal (35) of the current supply means;
a similarly acting terminal (a1) of the other winding strand or filament (20, 20'"'"') being connected through the main current carrying path of the other, complementary semiconductor switch means (pnp;
57, 69,
80) to the other terminal (33) of the current supply means;
the other terminal (e1) of said one winding strand or filament (21, 21'"'"') being connected with the other terminal (35) of the current supply means;
the other terminal (e2) of said other winding strand or filament (20, 20'"'"') being connected with said one terminal (33) of the current supply means;
said one inding strand or filament (21, 21'"'"') and said other winding strand or filament (20, 20'"'"') being tightly a-c coupled together at least at the terminal end portions thereof connected to the respective controlled semiconductor switch means;
wherein, further, said control circuit means includes output connection means (50) and coupling circuit means (53;
65, 68, 74;
82, 87,
89) connecting output signals from the rotor position sensor means to the control terminal of said complementary controlled semiconductor switch means for alternatingly controlling conduction of the respective switch means to cause pulsed current flow through the respective winding strand or filament from said current supply means,and wherein unilateral conduction means (59, 60;
80, 81") are provided, respectively connected across the controlled semiconductor switch mens (57, 59, 80;
58, 75,
81) and polarized reversely with respect to said semiconductor switch means to recapture inductive energy stored in the respective winding strands or filaments upon turn-off of current flow therethrough during commutation by the pulsed current flow as controlled by said controlled semiconductor switch means.
3 Assignments
0 Petitions
Accused Products
Abstract
To provide for efficient operation and recuperation of stored inductive energy in a pulse-operated motor, a preferably bifilar winding (20, 21; 20'"'"', 21'"'"') has its respective strands or filaments energized by complementary transistors (57, 58; 69, 75; 80, 81) which have reversely polarized free-wheeling diodes (59, 60; 80", 81") connected thereacross. A coupling capacity (47) is connected between the junctions of the respective transistors and the associated winding so that, upon turn-off of a transistor, as controlled by a rotor position sensor, such as a Hall generator (25), stored electromagnetic energy is coupled to flow through the free-wheeling diode of the transistor then to be connected, to be returned to a d-c source, such as a battery (34) or stored in a storage capacitor (45). The output signal from the rotor position sensor is in binary, high-low form, which can control the complementary transistors.
37 Citations
18 Claims
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1. Two-pulse, two-filament brushless d-c motor system having
a stator (15); - d-c current supply means having two terminals (33,35);
a permanent magnet rotor (11); rotor position sensing means (25) providing an output signal positioned on the stator and sensing a predetermined orientation of a magnet pole of the rotor with respect to the stator; armature winding means including two winding strands or filaments (20, 21;
20'"'"', 21'"'"') wound on the stator, said winding strands or filaments being inductively coupled;and control circuit means (42) including controlled semiconductor switch means (57, 58;
69, 75;
80,
81) connected to said winding strands or filaments to control pulsed current flow, alternately, through the respective winding strands or filaments,wherein, said semiconductor switch means are of respectively opposite, complementary conduction characteristics (pnp;
57, 69, 80;
npn;
58, 75,
81);one terminal (a2) of one winding strand or filament (21, 21'"'"') being connected through the main current carrying path of one of said semiconductor switch means (npn;
58, 75,
81) with one terminal (35) of the current supply means;a similarly acting terminal (a1) of the other winding strand or filament (20, 20'"'"') being connected through the main current carrying path of the other, complementary semiconductor switch means (pnp;
57, 69,
80) to the other terminal (33) of the current supply means;the other terminal (e1) of said one winding strand or filament (21, 21'"'"') being connected with the other terminal (35) of the current supply means; the other terminal (e2) of said other winding strand or filament (20, 20'"'"') being connected with said one terminal (33) of the current supply means; said one inding strand or filament (21, 21'"'"') and said other winding strand or filament (20, 20'"'"') being tightly a-c coupled together at least at the terminal end portions thereof connected to the respective controlled semiconductor switch means; wherein, further, said control circuit means includes output connection means (50) and coupling circuit means (53;
65, 68, 74;
82, 87,
89) connecting output signals from the rotor position sensor means to the control terminal of said complementary controlled semiconductor switch means for alternatingly controlling conduction of the respective switch means to cause pulsed current flow through the respective winding strand or filament from said current supply means,and wherein unilateral conduction means (59, 60;
80, 81") are provided, respectively connected across the controlled semiconductor switch mens (57, 59, 80;
58, 75,
81) and polarized reversely with respect to said semiconductor switch means to recapture inductive energy stored in the respective winding strands or filaments upon turn-off of current flow therethrough during commutation by the pulsed current flow as controlled by said controlled semiconductor switch means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- d-c current supply means having two terminals (33,35);
-
18. Two-pulse two-filamentary brushless d-c motor system having
a stator (15); -
d-c current supply means having two terminals (33,
35);a permanent magnet rotor (11); rotor position sensing means (25) providing an output signal positioned on the stator and sensing a predetermined orientation of a magnet pole of the rotor with respect to the stator; armature winding means including two winding strands or filaments (20, 21;
20;
40 , 21'"'"') wound on the stator, said winding strands or filaments being inductively coupled;and control circuit means connected to and controlled by said rotor position sensing means (25) including controlled semiconductor switch means (57, 58;
69, 75;
80,
81) connected to said winding strands or filaments to control pulsed current flow, alternately, through the respective winding strands or filaments;and wherein a first winding strand (21, 21'"'"') has one terminal connected to a first terminal (35) of the current supply means through one semiconductor switch means (58, 75,
81), said one switch means being of a first conductivity type (npn), and has its other terminal connected to the other terminal (33) of the current supply means;the second winding strand (20, 20'"'"') has one terminal connected to the other terminal (33) of the current supply means and through another semiconductor switch means (57, 69,
80), said other semiconductor switch means being of a second conductivity type (pnp), and has its other terminal connected to the first terminal (35) of the current supply means;said winding means being tightly a-c coupled at least adjacent the terminal ends (a1, a2) connected to the respective semiconductor switch means; the conduction of said first and second semiconductor switch means being controlled, in phase, by the rotor position sensing means (25) via said output signal therefrom; and unilateral conduction means (59, 60;
80", 81") respectively connected across respective semiconductor switch means and polarized reversely with respect to the associated semiconductor switch means to recapture inductive energy stored in the respective winding strands or filaments upon turn-off of current flow therethrough during commutation of pulsed current flow as controlled by said controlled semiconductor switch means,said semiconductor switch means applying a pulse, each, for each rotor rotation of 360°
-el to a respective winding strand or filament.
-
Specification