Direct electromagnetic reciprocating motor

• US 4,005,346 A
• Filed: 10/29/1975
• Issued: 01/25/1977
• Est. Priority Date: 10/29/1975
• Status: Expired due to Term

• Current Assignee: Tsang-Chen Hsia
• Original Assignee: Tsang-Chen Hsia
• Inventors: Hsia, Tsang-Chen
• Primary Examiner(s): Duggan, Donovan F.
• Application Number:
  US05/626,853
• Time in Patent Office: 454 Days
• Field of Search: 318/119-135, 310/23, 310/24, 310/30, 310/39, 310/35
• US Class Current: 318/128
• CPC Class Codes: H02K 33/14 wherein the alternate energisation and de-energisation of the two coil systems are effected or controlled by movement of the armatures

Abstract

An electromagnetic reciprocating motor is disclosed having a minimum number of moving parts. The motor consists of a hollow, tubular guide having a first drive coil mounted about a first end, a second drive coil mounted about a second end, and a third drive coil mounted about a central portion thereof. A ferromagnetic piston is mounted in sliding engagement within the hollow guide and a ferromagnetic pivot plate is pivotally mounted on the central portion of the guide with a switching means attached thereto for alternately energizing the first or second drive coils.

Claims

1. A reciprocating motor, comprising:

a hollow, tubular guide having a first coil mounted about a first end thereof, a third coil mounted about a central portion thereof, and a second coil mounted about a second end thereof;

a ferromagnetic piston mounted in sliding engagement within said hollow guide, having a length which overlaps said first and third coils when located at said first end and which overlaps said second and third coils when located at said second end;

a first ferromagnetic pole piece mounted on the central portion of said guide and spaced at said piston length from said first end thereof;

a second ferromagnetic pole piece mounted on the central portion of said guide and spaced at said piston length from said second end thereof;

a ferromagnetic pivot plate, pivotally mounted on the central portion of said guide, having a first end which contacts said first pole piece at a first pivotal position and a second end which contacts said second pole piece at a second pivotal position;

a first ferromagnetic yoke having a first end mounted on said first end of said guide and a second end spaced from said central portion of said guide and contacting said second end of said pivot plate at said first pivotal position;

a second ferromagnetic yoke having a first end mounted on said second end of said guide and a second end spaced from said central portion of said guide and contacting said first end of said pivot plate at said second pivotal position;

said plate pivoting into said first pivotal position forming a first magnetic circuit with said piston, first pole piece, and first yoke when said piston is at said first end of said guide;

said plate pivoting into said second pivotal position forming a second magnetic circuit with said piston, second pole piece, and second yoke when said piston is at said second end of said guide;

an electrical switching means mounted on said pivot plate and electrically connected to said first and second coils, for energizing said first coil when said plate is at said second pivotal position and for energizing said second coil when said plate is at said first pivotal position;

whereby said piston is forced into reciprocating motion within said guide.

2. The apparatus of claim 1, wherein said switching means further comprises:

a first contact means mounted on said first end of said pivot plate and electrically connected to said first coil to shunt said first coil when said plate is in said first position;

a second contact means mounted on said second end of said pivot plate and electrically connected to said second coil to shunt said second coil when said plate is in said second position.

3. The apparatus of claim 2, which further comprises:

said first coil comprises a fourth and fifth coils wound with first ends in a first direction;

said third coil comprises a sixth and seventh coils wound with first ends in a first direction;

said second coil comprises an eighth and ninth coils wound with first ends in a first direction;

said fourth and fifth coils having said first ends connected to a first input terminal;

said fourth coil having a second end connected to said first end of said sixth coil and, through said first contact, to said first input terminal;

said fifth coil having said second end connected to said first end of said seventh coil and, through said first contact, to said first input terminal

said sixth coil having said second end connected to said first end of said eighth coil and, through said second contact, to a second input terminal;

said seventh coil having said second end connected to said first end of said ninth coil and, through said second contact, to said second terminal;

said eighth and ninth coils having said second ends connected to said second input terminal.

4. The apparatus of claim 3, which further comprises:

a current rectification means in series between said second input terminal and an alternating current source.

5. The apparatus of claim 3, which further comprises:

a current adjusting means in series between said second input terminal and a current supply source, to adjust the speed of the reciprocating motor.

6. The apparatus of claim 1, wherein said guide is a hollow cylinder which constrains said piston to undergo linear reciprocating motion.

7. The apparatus of claim 2, which further comprises:

said first and second coils being connected between positive and negative direct current supply terminals;

a first thyristor having its anode connected at a first end of said first coil opposite from said negative supply terminal and its cathode connected to said first contact means on said pivot plate;

a first sensing coil wound about said second coil and connected between said cathode and the gate electrode of said first thyristor, for generating a trigger pulse when said piston moves toward said first end of said guide;

said first contact means being connected to said negative supply terminal when said pivot plate is in said first pivotal position, supplying a cathode potential to said first thyristor;

a second thyristor having its cathode connected at a first end of said second coil opposite from said positive supply terminal and its anode connected to said second contact means on said pivot plate;

a second sensing coil wound about said first coil and connected between said cathode and the gate electrode of said second thyristor, for generating a trigger pulse when said piston moves toward said second end of said guide;

said second contact means being connected to said positive supply terminal when said pivot plate is in said second pivotal position, supplying an anode potential to said second thyristor;

whereby said piston undergoes reciprocating motion in said guide.

8. The apparatus of claim 2, which further comprises:

said first coil comprised of a fourth and fifth coils connected between positive and negative direct current supply terminals, with the fourth coil proximate to and said fifth coil spaced from said first end of said guide;

a first thyristor having its anode connected at a first end of said fourth coil opposite from said negative supply terminal and its cathode connected to said first contact means on said pivot plate;

a second thyristor having its anode connected at a first end of said fifth coil opposite from said negative supply terminal and its cathode connected to said first contact means on said pivot plate;

a first sensing coil wound about said second coil proximate to said first pole piece, and connected to said cathode and the gate electrode of said first thyristor, for generating a trigger pulse when said piston moves toward said first end of said guide;

a second sensing coil wound about said first coil proximate to said first end of said guide, and connected to said cathode and the gate electrode of said second thyristor, for generating a trigger pulse when said piston starts to move toward said second end of said guide;

said first contact means being connected to said negative supply terminal when said pivot plate is in said first pivotal position, supplying a cathode potential to said first and second thyristors;

said second coil comprised of a sixth and seventh coils connected between said positive and negative direct current supply terminals, with the sixth coils proximate to and the seventh coil spaced from said second end of said guide;

a third thyristor having its cathode connected at a first end of said sixth coil opposite from said positive supply terminal and its anode connected to said second contact means on said pivot plate;

a fourth thyristor having its cathode connected at a first end of said seventh coil opposite from said positive supply terminal and its anode connected to said second contact means on said pivot plate;

a third sensing coil wound aout said first coil proximate to said second pole piece, and connected between said cathode and the gate electrode of said third thyristor, for generating a trigger pulse when said piston moves toward said second end of said guide;

a fourth sensing coil wound about said second coil proximate to said second end of said guide, and connected between said cathode and the gate electrode of said fourth thyristor, for generating a trigger pulse when said piston starts to move toward said first end of said guide;

said second contact means being connected to said positive supply terminal when said pivot plate is in said second pivotal position, supplying an anode potential to said third and fourth thyristors;

whereby said piston undergoes reciprocating motion in said guide.

9. The apparatus of claim 2, which further comprises:

said first coil comprised of a fourth, fifth, sixth and seventh coils connected between positive and negative direct current supply terminals, mounted between said first end of said guide and said second pole piece, with the fourth coil proximate to said first end of said guide, the seventh coil proximate to said second pole piece, the fifth coil proximate to said fourth coil and the sixth coil proximate to the seventh coil;

a first, second, third and fourth thyristors having their anodes respectively connected at first ends of said fourth, fifth, sixth and seventh coils, opposite from said negative supply terminal and their cathodes connected to said first contact means on said pivot plate;

said first contact means being connected to said negative supply terminal when said pivot plate is in said first pivotal position, supplying a cathode potential to said first, second, third and fourth thyristors;

said second coil comprised of a eighth, ninth, 10th and 11th coils connected between said positive and negative direct current supply terminals, mounted between said second end of said guide and said first pole piece, with the eighth coil proximate to said second end of said guide, the eleventh coil proximate to said first pole piece, said ninth coil proximate to said eighth coil and said tenth coil proximate to said 11th coil;

a fifth, sixth, seventh and eighth thyristors having their cathodes respectively connected at first ends of said eighth, ninth, 10th and 11th coils, opposite from said positive supply terminal and their anodes connected to said second contact means on said pivot plate;

said second contact means being connected to said positive supply terminal when said pivot plate is in said second pivotal position, supplying an anode potential to said fifth, sixth, seventh and eighth thyristors;

a first sensing coil wound around said eleventh coil and connected between the cathode and gate electrode of said first thyristor;

a second, third and fourth sensing coils, respectively wound around said fourth, fifth and sixth coils, and respectively connected between the cathode and gate electrode of said second, third and fourth thyristors;

a fifth sensing coil wound around said seventh coil and connected between the cathode and gate electrode of said fifth thyristor;

a sixth, seventh and eighth sensing coils respectively wound around said eighth, ninth and 10th coils, and respectively connected between the cathode and gate electrode of said sixth, seventh and eighth thyristors;

whereby said piston undergoes reciprocating motion in said guide.

10. The apparatus of claim 9, which further comprises:

said third coil comprised of a 12th and 13th coils;

said fifth, seventh, 12th, 10th and eighth coils are connected in series between said positive and negative supply terminals;

said fourth, sixth, 13th, 11th and ninth coils are connected in series between said positive and negative supply terminals.