公开(公告)号：US09755546B2

公开(公告)日：2017-09-05

申请号：US14646465

申请日：2012-11-21

Applicant: OTIS ELEVATOR COMPANY

Inventor： Luis Arnedo ,  Marinko Kovacic ,  Yang Wang ,  Shashank Krishnamurthy

IPC: H02M7/487 ,  H02M7/537

CPC classification number: H02M7/537 ,  H02M7/487

Abstract: A neutral point clamped, multilevel level converter includes a DC voltage link; a first capacitor coupling one side of the DC link to a neutral point; a second capacitor coupling another side of the DC link to the neutral point; a plurality of phase legs, each phase leg including switches, each phase leg coupled to an AC node; a current sensor associated with each AC node; and a controller generating a PWM signal to control the switches, the controller generating a current zero sequence component in response to current sensed at each of the current sensors, the controller adjusting a modulation index signal in response to the current zero sequence component to produce the PWM signal.

公开(公告)号：US20060054458A1

公开(公告)日：2006-03-16

申请号：US10532997

申请日：2002-12-13

Applicant: Helmut Meyer ,  Richard Fargo

Inventor： Helmut Meyer ,  Richard Fargo

IPC: B66B23/02

CPC classification number: B66B23/024 ,  B66B23/02 ,  B66B23/028

Abstract: A plurality of stepchain links (30, 130, 230) of a passenger conveyor system (20) connected to form a continuous loop are from die cast or from stamped or laser cut metal. Each stepchain link (30, 130, 230) includes a plurality of teeth (32, 132, 232) made of a single piece of material that engage a drive member (36). In one example, a plate of injection molded plastic teeth (294) are snapped onto the links to reduce corrosion.

Abstract translation: 连接形成连续回路的乘客输送机系统（20）的多个梯形链节（30,130,230）来自压铸或冲压或激光切割金属。 每个阶梯链节（30,130,230）包括由接合驱动构件（36）的单块材料制成的多个齿（32,132,232）。 在一个示例中，注射成型的塑料齿（294）板被卡在链节上以减少腐蚀。