US20020175570A1 - Auto-centering linear motor - Google Patents
Auto-centering linear motor Download PDFInfo
- Publication number
- US20020175570A1 US20020175570A1 US09/863,713 US86371301A US2002175570A1 US 20020175570 A1 US20020175570 A1 US 20020175570A1 US 86371301 A US86371301 A US 86371301A US 2002175570 A1 US2002175570 A1 US 2002175570A1
- Authority
- US
- United States
- Prior art keywords
- axis
- permanent magnet
- flux loop
- magnet ring
- measured
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
- H02K35/02—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
Definitions
- the invention is in the general field of reciprocating permanent magnet AC electric motors and generators. Specifically, it is a means of generating magnetic centering forces to confine reciprocating magnets within the air gaps of such machines.
- Reference 1 discloses an AC electrical machine that can be used either as a generator to convert reciprocating motion of a permanent magnet ring to AC voltage, or as a motor to convert AC voltage to reciprocating motion of a permanent magnet ring.
- permanent magnets 50 reciprocate in a left-right direction, and if the machine is conventionally designed, there will be no force on the permanent magnets if there is no current in armature coil 56 , provided the magnets do not emerge from the air gaps. If the magnets do so emerge, strong magnetic forces are generated that expel the magnets further.
- mechanical and/or magnetic centering springs have been used in prior art. The latter are disclosed in Reference 2 . Centering springs introduce complication and increase cost. The object of the present invention is to provide magnetically generated centering force on the reciprocating magnets without adding cost or complexity.
- the ferromagnetic structure ( 60 , 62 , 64 , 68 of FIG. 6, Reference 1 ) is designed unconventionally in that all or part of it is allowed to magnetically saturate as permanent magnets 50 of Ref. 1 approach the left or right extremes of the air gap in which they reciprocate.
- Conventional design avoids magnetic saturation because it degrades performance by lowering efficiency, and, in the case of generators, distorts output voltage waveform.
- a linear motion AC motor-generator of the type disclosed in Ref. 1 but modified according to the invention, it is found that useful centering forces can be generated without incurring a significant performance penalty.
- FIG. 1A is a cross sectional view of a linear, permanent magnet motor or generator according to prior art.
- FIG. 1A dimensions and magnetic quantities that are changed by the invention are identified by symbols.
- FIG. 1B is a cross-sectional view of a linear, permanent magnet motor or generator, in which dimensions and magnetic quantities that distinguish the invention from prior art are identified by symbols.
- FIG. 2 shows graphs of magnetic quantities in the iron structure according to prior art and in the invention. These quantities are plotted against displacement X of the magnets from their centered position.
- the quantities graphed are magnetic intensity H′ (prior art), magnetic flux density B′ (prior art), H (invention) and B (invention).
- FIG. 3 shows, for prior art and the invention, graphs of magnetic force on the motor magnets plotted against displacement of the magnets from their centered position.
- FIG. 1A is a cross-sectional view of a contemporary embodiment of a reciprocating permanent magnet motor or generator as disclosed in U.S. Pat. No. 4,602,174.
- the machine is substantially axially symmetric about axis A-A.
- a permanent magnet ring 1 is magnetized radially with magnetization M, and reciprocates parallel to A-A in air gaps bounded by outer ferromagnetic structure 2 and inner ferromagnetic structure 3 .
- a coil of wire 4 surrounds inner ferromagnetic structure 3 .
- X denotes axial displacement of the magnet ring from the position where it is centered axially within the air gaps.
- the magnetic flux density B′ and the magnetic intensity H′ in the inner and outer ferromagnetic structures are functions of X and of the dimensions y′ and Y′, and are denoted in FIG. 1A by the conventional functional notation B′ (X), H′ (X) respectively.
- FIG. 2 shows graphs of H′ (X) and B′ (X) in a prior art machine conventionally designed to avoid magnetic saturation.
- B′ (X) is a substantially linear function of X with a maximum value typically less than 13000 Gauss, and H′ (X) is typically below 10 Oersted for all X.
- FIG. 1B is a cross sectional view of a linear permanent magnet motor or generator according to the invention.
- FIG. 2 shows graphs of H(X) and B(X) in a motor or generator according to the invention.
- L/2 falls below a linear projection of its values at small X, and reaches a maximum value exceeding 15000 Gauss.
- the minus sign in equation (1) means F is in a direction opposite to dX.
- the integral must in principle be taken over all of space, but in prior art and in the invention, the dominant contribution to it is from the volume occupied by ferromagnetic structures 2 and 3 of FIGS. 1A and 1B, provided the magnet ring does not leave the air gaps.
- magnetic saturation is avoided by dimensioning the ferromagnetic structure so that H′ is considerably less than 10 Oersted for all X (5 Oersteds is typical), and F is too low to be of practical use in confining the magnet ring. In the invention, however, saturation typically raises H(L/2) to above 20 Oersted, resulting in a much larger value of F that will prevent magnet ring 1 from leaving the air gap.
- FIG. 3 shows graphs of F in prior art and in the invention. In both cases the magnets will be expelled from the air gap if
- ⁇ L/2. In the invention, but not in prior art, there is a relatively large restraining force to prevent magnet ring 1 from reaching X L/2 and subsequently being expelled from the air gap.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Linear Motors (AREA)
Abstract
Description
- 1. U.S. Pat. 4,602,174
- 2. Disclosure Document no. 172295
- The invention is in the general field of reciprocating permanent magnet AC electric motors and generators. Specifically, it is a means of generating magnetic centering forces to confine reciprocating magnets within the air gaps of such machines.
- Reference1 discloses an AC electrical machine that can be used either as a generator to convert reciprocating motion of a permanent magnet ring to AC voltage, or as a motor to convert AC voltage to reciprocating motion of a permanent magnet ring. Referring to FIG. 4 of Reference 1, permanent magnets 50 reciprocate in a left-right direction, and if the machine is conventionally designed, there will be no force on the permanent magnets if there is no current in armature coil 56, provided the magnets do not emerge from the air gaps. If the magnets do so emerge, strong magnetic forces are generated that expel the magnets further. To prevent emergence of the magnets and their subsequent expulsion from the air gap, mechanical and/or magnetic centering springs have been used in prior art. The latter are disclosed in
Reference 2. Centering springs introduce complication and increase cost. The object of the present invention is to provide magnetically generated centering force on the reciprocating magnets without adding cost or complexity. - In the invention, the ferromagnetic structure (60, 62, 64, 68 of FIG. 6, Reference 1) is designed unconventionally in that all or part of it is allowed to magnetically saturate as permanent magnets 50 of Ref. 1 approach the left or right extremes of the air gap in which they reciprocate. Theory shows, and experiment confirms, that magnetic saturation causes a force to be exerted on the reciprocating magnets in a direction such as to confine the magnets within the air gap. Conventional design avoids magnetic saturation because it degrades performance by lowering efficiency, and, in the case of generators, distorts output voltage waveform. In a linear motion AC motor-generator of the type disclosed in Ref. 1 but modified according to the invention, it is found that useful centering forces can be generated without incurring a significant performance penalty.
- FIG. 1A is a cross sectional view of a linear, permanent magnet motor or generator according to prior art. In FIG. 1A, dimensions and magnetic quantities that are changed by the invention are identified by symbols.
- FIG. 1B is a cross-sectional view of a linear, permanent magnet motor or generator, in which dimensions and magnetic quantities that distinguish the invention from prior art are identified by symbols.
- FIG. 2 shows graphs of magnetic quantities in the iron structure according to prior art and in the invention. These quantities are plotted against displacement X of the magnets from their centered position. The quantities graphed are magnetic intensity H′ (prior art), magnetic flux density B′ (prior art), H (invention) and B (invention).
- FIG. 3 shows, for prior art and the invention, graphs of magnetic force on the motor magnets plotted against displacement of the magnets from their centered position.
- FIG. 1A is a cross-sectional view of a contemporary embodiment of a reciprocating permanent magnet motor or generator as disclosed in U.S. Pat. No. 4,602,174. The machine is substantially axially symmetric about axis A-A. A permanent magnet ring1 is magnetized radially with magnetization M, and reciprocates parallel to A-A in air gaps bounded by outer
ferromagnetic structure 2 and innerferromagnetic structure 3. A coil ofwire 4 surrounds innerferromagnetic structure 3. X denotes axial displacement of the magnet ring from the position where it is centered axially within the air gaps. With no current incoil 4, the magnetic flux density B′ and the magnetic intensity H′ in the inner and outer ferromagnetic structures are functions of X and of the dimensions y′ and Y′, and are denoted in FIG. 1A by the conventional functional notation B′ (X), H′ (X) respectively. - FIG. 2 shows graphs of H′ (X) and B′ (X) in a prior art machine conventionally designed to avoid magnetic saturation. B′ (X) is a substantially linear function of X with a maximum value typically less than 13000 Gauss, and H′ (X) is typically below 10 Oersted for all X.
- FIG. 1B is a cross sectional view of a linear permanent magnet motor or generator according to the invention. FIG. 1B the same as FIG. 1A except that one or both of dimensions y and Y are made sufficiently smaller than their prior art counterparts y′ and Y′ so that magnetic saturation occurs near X=L/2 and X=−L/2, which are the values of X at which magnets1 begin to emerge from the air gap between
iron structures - FIG. 2 shows graphs of H(X) and B(X) in a motor or generator according to the invention. Near |X|=L/2, H(X) rises above 20 Oersted, exceeding typical saturation for electrical steel, which is about 10 oersted. B(X) near |X|=L/2 falls below a linear projection of its values at small X, and reaches a maximum value exceeding 15000 Gauss.
- The purpose of allowing parts of
ferromagnetic structures - F=−∫H×dB/dX×dV equation (1)
- The minus sign in equation (1) means F is in a direction opposite to dX. The integral must in principle be taken over all of space, but in prior art and in the invention, the dominant contribution to it is from the volume occupied by
ferromagnetic structures - FIG. 3 shows graphs of F in prior art and in the invention. In both cases the magnets will be expelled from the air gap if |X|≧L/2, as indicated by rapidly increasing force for |X|≧L/2. In the invention, but not in prior art, there is a relatively large restraining force to prevent magnet ring1 from reaching X=L/2 and subsequently being expelled from the air gap.
- Considerable variation is possible within the spirit of the invention. For example, magnetic saturation could be confined to outer
ferromagnetic structure 2, or to innerferromagnetic structure 3, rather than existing in both structures.
Claims (1)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/863,713 US6483207B1 (en) | 2001-05-23 | 2001-05-23 | Auto-centering linear motor |
JP2002126569A JP4469124B2 (en) | 2001-05-23 | 2002-04-26 | Means for generating magnetic centripetal force |
CNB028105184A CN1320737C (en) | 2001-05-23 | 2002-05-20 | Auto-centering linear motor |
BRPI0209915A BRPI0209915B1 (en) | 2001-05-23 | 2002-05-20 | electromagnetic transducer for converting reciprocal motion to alternating voltage or converting alternating voltage to reciprocal motion |
PCT/US2002/015964 WO2002095905A2 (en) | 2001-05-23 | 2002-05-20 | Auto-centering linear motor |
DE10296891T DE10296891T5 (en) | 2001-05-23 | 2002-05-20 | Self-centering linear motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/863,713 US6483207B1 (en) | 2001-05-23 | 2001-05-23 | Auto-centering linear motor |
Publications (2)
Publication Number | Publication Date |
---|---|
US6483207B1 US6483207B1 (en) | 2002-11-19 |
US20020175570A1 true US20020175570A1 (en) | 2002-11-28 |
Family
ID=25341626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/863,713 Expired - Lifetime US6483207B1 (en) | 2001-05-23 | 2001-05-23 | Auto-centering linear motor |
Country Status (6)
Country | Link |
---|---|
US (1) | US6483207B1 (en) |
JP (1) | JP4469124B2 (en) |
CN (1) | CN1320737C (en) |
BR (1) | BRPI0209915B1 (en) |
DE (1) | DE10296891T5 (en) |
WO (1) | WO2002095905A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050211198A1 (en) * | 2004-03-26 | 2005-09-29 | Froeschle Thomas A | Electromagnetic actuator and control |
US20120207628A1 (en) * | 2011-02-15 | 2012-08-16 | King Abdulaziz City For Science And Technology | Spring-less buried magnet linear-resonant motor |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6774510B1 (en) * | 2000-10-25 | 2004-08-10 | Harman International Industries, Inc. | Electromagnetic motor with flux stabilization ring, saturation tips, and radiator |
US6914351B2 (en) | 2003-07-02 | 2005-07-05 | Tiax Llc | Linear electrical machine for electric power generation or motive drive |
TW200526131A (en) * | 2003-11-12 | 2005-08-16 | J Oil Mills Inc | Method of application of body taste enhancer comprising long-chain highly unsaturated fatty acid and/or its ester |
US7137259B2 (en) * | 2003-12-05 | 2006-11-21 | Superconductor Technologies Inc. | Cryocooler housing assembly apparatus and method |
KR100548293B1 (en) * | 2003-12-30 | 2006-02-02 | 엘지전자 주식회사 | Structure for fixing magnet of reciprocating compressor |
JP4789497B2 (en) * | 2005-03-31 | 2011-10-12 | パナソニック株式会社 | Linear actuator |
US7201096B2 (en) * | 2005-06-06 | 2007-04-10 | Caterpillar Inc | Linear motor having a magnetically biased neutral position |
WO2007061920A2 (en) * | 2005-11-17 | 2007-05-31 | Tiax Llc | Linear electrical machine for electric power generation or motive drive |
US7345372B2 (en) * | 2006-03-08 | 2008-03-18 | Perpetuum Ltd. | Electromechanical generator for, and method of, converting mechanical vibrational energy into electrical energy |
CN101527536B (en) * | 2009-04-14 | 2012-08-29 | 王照雷 | Method for monitoring the operation state of generator and system thereof |
JP2011030411A (en) * | 2009-07-01 | 2011-02-10 | Toshiba Mach Co Ltd | Linear motor |
US9689344B1 (en) | 2013-01-09 | 2017-06-27 | David Ray Gedeon | Double-acting modular free-piston stirling machines without buffer spaces |
US9722476B2 (en) | 2013-04-04 | 2017-08-01 | L-3 Communications Cincinnati Electronics Corporation | Self-centering electromagnetic transducers |
CN106160394B (en) * | 2016-07-15 | 2018-07-03 | 西安交通大学 | A kind of magnetic spring electromagnetic vibration energy trap setting |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1226966A (en) * | 1967-08-31 | 1971-03-31 | ||
US4602174A (en) | 1983-12-01 | 1986-07-22 | Sunpower, Inc. | Electromechanical transducer particularly suitable for a linear alternator driven by a free-piston stirling engine |
DE3347360C2 (en) * | 1983-12-28 | 1995-04-13 | Papst Motoren Gmbh & Co Kg | Brushless external rotor DC motor |
US4647802A (en) * | 1985-06-13 | 1987-03-03 | Hewlett-Packard Company | Variable reluctance motor with reduced torque ripple |
US5148066A (en) * | 1991-08-19 | 1992-09-15 | Sunpower, Inc. | Linear generator or motor with integral magnetic spring |
-
2001
- 2001-05-23 US US09/863,713 patent/US6483207B1/en not_active Expired - Lifetime
-
2002
- 2002-04-26 JP JP2002126569A patent/JP4469124B2/en not_active Expired - Lifetime
- 2002-05-20 WO PCT/US2002/015964 patent/WO2002095905A2/en not_active Application Discontinuation
- 2002-05-20 DE DE10296891T patent/DE10296891T5/en not_active Ceased
- 2002-05-20 CN CNB028105184A patent/CN1320737C/en not_active Expired - Lifetime
- 2002-05-20 BR BRPI0209915A patent/BRPI0209915B1/en active IP Right Grant
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050211198A1 (en) * | 2004-03-26 | 2005-09-29 | Froeschle Thomas A | Electromagnetic actuator and control |
EP1596402A2 (en) * | 2004-03-26 | 2005-11-16 | Bose Corporation | Electromagnetic actuator and control |
EP1596402A3 (en) * | 2004-03-26 | 2006-07-19 | Bose Corporation | Electromagnetic actuator and control |
US20060213467A1 (en) * | 2004-03-26 | 2006-09-28 | Bose Corporation, A Delaware Corporation | Electromagnetic actuator and control |
US7128032B2 (en) | 2004-03-26 | 2006-10-31 | Bose Corporation | Electromagnetic actuator and control |
US7252053B2 (en) | 2004-03-26 | 2007-08-07 | Bose Corporation | Electromagnetic actuator and control |
EP1804259A3 (en) * | 2004-03-26 | 2008-04-16 | Bose Corporation | Electromagnetic actuator and control |
US20120207628A1 (en) * | 2011-02-15 | 2012-08-16 | King Abdulaziz City For Science And Technology | Spring-less buried magnet linear-resonant motor |
US8692422B2 (en) * | 2011-02-15 | 2014-04-08 | King Abdulaziz City For Science And Technology | Spring-less buried magnet linear-resonant motor |
US8704411B2 (en) | 2011-02-15 | 2014-04-22 | King Abdulaziz City For Science And Technology | Spring-less buried magnet linear-resonant motor |
US9350221B2 (en) | 2011-02-15 | 2016-05-24 | King Abdulaziz City For Science And Technology | Spring-less buried magnet linear-resonant motor |
Also Published As
Publication number | Publication date |
---|---|
US6483207B1 (en) | 2002-11-19 |
JP2002369485A (en) | 2002-12-20 |
CN1320737C (en) | 2007-06-06 |
WO2002095905A3 (en) | 2003-01-23 |
BR0209915A (en) | 2004-04-06 |
BRPI0209915B1 (en) | 2016-05-24 |
DE10296891T5 (en) | 2004-05-27 |
JP4469124B2 (en) | 2010-05-26 |
CN1511368A (en) | 2004-07-07 |
WO2002095905A2 (en) | 2002-11-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6483207B1 (en) | Auto-centering linear motor | |
US5175457A (en) | Linear motor or alternator plunger configuration using variable magnetic properties for center row and outer rows of magnets | |
US4937481A (en) | Permanent magnet linear electromagnetic machine | |
US4827163A (en) | Monocoil reciprocating permanent magnet electric machine with self-centering force | |
US7683507B2 (en) | Tubular electrical generators | |
US4602174A (en) | Electromechanical transducer particularly suitable for a linear alternator driven by a free-piston stirling engine | |
CN104702078B (en) | Permanent magnet linear vibration motor and electrical equipment | |
US3606595A (en) | Electromagnetic pump utilizing a permanent magnet | |
JP3302777B2 (en) | Moving magnet type actuator | |
JP3302727B2 (en) | Moving magnet type actuator | |
US20020053834A1 (en) | Linear motor | |
RU2173499C2 (en) | Ac generator | |
US2992342A (en) | Reciprocating type electric generator | |
GB2214724A (en) | Permanent magnet electric motor | |
CN217159522U (en) | Linear motor and linear compressor | |
RU2304342C1 (en) | Reciprocate motion generator | |
JP5758068B2 (en) | Electromagnetic induction generator | |
JPS61218120A (en) | Magnetic field generator | |
JPS591414Y2 (en) | Reciprocating drive device | |
JPH0644385U (en) | Movable magnet type actuator | |
CN217388508U (en) | Magnetic circuit structure of linear motor, linear motor and moving-coil linear compressor | |
Kravčák | Optimization of magnetic flux in electromagnetic vibrating generators | |
CN108475977B (en) | Linear generator | |
KR850005724A (en) | magnetron | |
SU1458931A1 (en) | Dynamoelectric machine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FEPP | Fee payment procedure |
Free format text: PAT HOLDER CLAIMS SMALL ENTITY STATUS, ENTITY STATUS SET TO SMALL (ORIGINAL EVENT CODE: LTOS); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 12 |
|
AS | Assignment |
Owner name: MIDWEST COMMUNITY DEVELOPMENT FUND IX, L.L.C., LOU Free format text: SECURITY INTEREST;ASSIGNOR:GLOBAL COOLING, B.V.;REEL/FRAME:037617/0395 Effective date: 20160126 |
|
AS | Assignment |
Owner name: PACIFIC WESTERN BANK, NORTH CAROLINA Free format text: SECURITY INTEREST;ASSIGNOR:GLOBAL COOLING B.V.;REEL/FRAME:044189/0159 Effective date: 20171113 |
|
AS | Assignment |
Owner name: MIDWEST COMMUNITY DEVELOPMENT FUND IX, L.L.C., LOU Free format text: SECURITY INTEREST;ASSIGNOR:GLOBAL COOLING, B.V.;REEL/FRAME:047746/0368 Effective date: 20181207 Owner name: ADVANTAGE CAPITAL COMMUNITY DEVELOPMENT FUND XXXII Free format text: SECURITY INTEREST;ASSIGNOR:GLOBAL COOLING, B.V.;REEL/FRAME:047746/0368 Effective date: 20181207 |
|
AS | Assignment |
Owner name: MIDCAP BUSINESS CREDIT LLC, CONNECTICUT Free format text: SECURITY INTEREST;ASSIGNORS:GLOBAL COOLING, INC.;GLOBAL COOLING B.V.;REEL/FRAME:054689/0619 Effective date: 20201216 Owner name: GLOBAL COOLING B.V., OHIO Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:PACIFIC WESTERN BANK;REEL/FRAME:054807/0709 Effective date: 20201216 |
|
AS | Assignment |
Owner name: ADVANTAGE CAPITAL COMMUNITY DEVELOPMENT FUND XXXIII, L.L.C., LOUISIANA Free format text: SECURITY INTEREST;ASSIGNOR:GLOBAL COOLING, B.V.;REEL/FRAME:055296/0578 Effective date: 20210212 Owner name: ADVANTAGE CAPITAL COMMUNITY DEVELOPMENT FUND XXXII, L.L.C., LOUISIANA Free format text: SECURITY INTEREST;ASSIGNOR:GLOBAL COOLING, B.V.;REEL/FRAME:055296/0578 Effective date: 20210212 |
|
AS | Assignment |
Owner name: EMD ACQUISITION LLC, NEVADA Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:MIDCAP BUSINESS CREDIT LLC;REEL/FRAME:058034/0799 Effective date: 20211014 |
|
AS | Assignment |
Owner name: GLOBAL COOLING, B.V., NETHERLANDS Free format text: RELEASE BY SECURED PARTY;ASSIGNORS:ADVANTAGE CAPITAL COMMUNITY DEVELOPMENT FUND XXXII, L.L.C.;ADVANTAGE CAPITAL COMMUNITY DEVELOPMENT FUND XXXIII, L.L.C.;REEL/FRAME:061192/0739 Effective date: 20220920 |