Conveying device, sample analysis system and sample pretreatment device including the conveying device, and method for conveying conveyance object

Patent metadata

Field	Value
Publication number	US-11851282-B2
Application number	US-202017434945-A
Country	US
Kind code	B2
Filing date	Jan 14, 2020
Priority date	Mar 8, 2019
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

The invention provides a conveying device having a conveying performance higher than that of the related art, a sample analysis system and sample pretreatment device with the conveying device and a method for conveying a conveyance object. A conveying device 1 includes a permanent magnet 10 which is provided on a sample rack 111 side, magnetic poles 25 each of which includes a core 22 made of a second magnetic body and a winding 21 wound around an outer periphery of the core 22 , drive circuits 50 each of which supplies a current to the winding 21 of the magnetic pole 25 , and current command calculation units 55 each of which controls a value of the current to be supplied to the winding 21 from the drive circuit 50 . The current command calculation unit 55 makes the currents to be supplied to the windings 21 vary.

First claim

The invention claimed is:

1. A conveying device, comprising:
a first magnetic body which is provided on a side of a conveyance object;
two or more magnetic circuits which each include a core made of a second magnetic body and a winding wound on an outer periphery of the core;
a drive circuit which supplies a current to the winding of the magnetic circuit;
a calculation unit which controls a value of the current to be supplied from the drive circuit to the winding; and
a conveyance object detection unit which detects a position or speed of the first magnetic body, wherein
the calculation unit makes the values of currents to be supplied to the respective windings adjacent to each other along a traveling direction of the conveyance object, different from each other in positive and negative, makes the current to be supplied to the winding vary based on information on the position or speed of the first magnetic body which is detected by the conveyance object detection unit, and makes, when a pitch of two or more of the cores is set to Pc, a current value in a ½ Pc section larger than a current value after ½ Pc.

2. The conveying device according to claim 1 , further comprising:
a weight detection unit which detects weight of the conveyance object, wherein
the calculation unit makes the current to be supplied to the winding vary based on weight information of the conveyance object which is detected by the weight detection unit.

3. The conveying device according to claim 1 , wherein
the calculation unit makes directions of magnetic fluxes generated by the respective windings adjacent to each other along the traveling direction of the conveyance object, opposite to each other.

4. The conveying device according to claim 1 , wherein
when two or more of the magnetic circuits are provided, and
at least two of the conveyance objects each provided with the first magnetic body are provided,
the calculation unit makes, when the number of the conveyance objects is set to N, values of currents of N or more continuous windings different one another.

5. The conveying device according to claim 4 , wherein
the calculation unit makes the values of the currents of the N or more continuous windings increase or decrease in the traveling direction of the conveyance object.

6. The conveying device according to claim 1 , wherein
when a pitch of two or more of the cores is set to Pc, and a gap Pm between two or more of the first magnetic bodies satisfies a relationship of 2Pc≤Pm, a polarity of the first magnetic body is the same.

7. The conveying device according to claim 1 , wherein
the first magnetic body is a permanent magnet.

8. A sample analysis system, comprising:
the conveying device according to claim 1 .

9. A sample pretreatment device, comprising:
the conveying device according to claim 1 .

10. A method for conveying a conveyance object, the conveyance object including a magnetic body, the method comprising:
a conveying step of applying a thrust to a first magnetic body provided on a side of the conveyance object by supplying a current to two or more magnetic circuits each including: i) a core made of a second magnetic body and ii) a winding wound around an outer periphery of the core, to excite the core; and
a conveyance object detection step of detecting a position or speed of the conveyance object, wherein
in the conveying step, values of currents to be supplied to the respective windings adjacent to each other along a traveling direction of the conveyance object are different from each other in positive and negative, the current to be supplied to the winding varies based on information on the position or speed of the first magnetic body which is detected in the conveyance object detection step, and, when a pitch of two or more of the cores is set to Pc, a current value in a ½ Pc section is larger than a current value after ½ Pc.

11. The method for conveying the conveyance object according to claim 10 , further comprising:
a weight detection step of detecting weight of the conveyance object, wherein
in the conveying step, the current to be supplied to the winding varies based on information on the weight of the conveyance object which is detected in the weight detection step.

12. The method for conveying the conveyance object according to claim 10 , wherein
when two or more of the magnetic circuits and at least two conveyance objects each provided with the first magnetic body are provided,
in the conveying step, when the number of the conveyance objects is set to N, values of currents of N or more continuous windings are different one another.

Assignees

• Hitachi High Tech Corp

Inventors

• Aoyama Yasuaki
• Hoshi Ryosuke
• Kobayashi Hiroyuki
• Kaneko Satoru
• Tamakoshi Takeshi
• Watanabe Hiroshi
• Kambara Katsuhiro
• Onizawa Kuniaki

Classifications

• B65G43/00 Primary

  Control devices, e.g. for safety, warning or fault-correcting · CPC title

• B65G23/00

  Driving gear for endless conveyors; Belt- or chain-tensioning arrangements · CPC title

• B65G54/02

  electrostatic, electric, or magnetic · CPC title

• H02P29/00

  Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors (arrangements for starting electric motors H02P1/00; arrangements for stopping or slowing electric motors H02P3/00; control of motors that can be connected to two or more different electric power supplies H02P4/00; regulating or controlling the speed or torque of two or more electric motors H02P5/00; vector control H02P21/00) · CPC title

• B65G2203/0258

  Weight of the article · CPC title