Otis Elevator Company

Steven M Millett

Ismail Agirman

Daryl J Marvin

Amir Lotfi

Yang Wang

Shashank Krishnamurthy

HanJong Kim

Michael Mann

YiSug Kwon

Benjamin J Watson

Camilo Cardona

KilMoon Yoon

Jeongki Shin

Tao Mu

A braking system for an elevator includes an electromagnetic brake operably connected to an elevator car, and a control circuit operably connected to the electromagnetic brake. The control circuit includes a switching mechanism configured to selectively modify a rate of engagement of the electromagnetic brake to selectively modify a rate of deceleration of the elevator car. The switching mechanism has a first position, a second position and a third position, to selectively modify the rate of engagement.

Adjustment of drop rate of elevator car with electromagnetic brake system

This disclosure relates to a system and method configured to identify and, if necessary, respond to conditions indicative of electromagnetic brake temperature, and in particular relates to passenger conveyers, such as elevators, employing the system and method. More specifically, an example passenger conveyer system includes an electromagnetic brake and a controller configured to identify a condition indicative of a temperature of the electromagnetic brake approaching a boundary of a predetermined operating range.

System and method configured to identify conditions indicative of electromagnetic brake temperature

A regenerative drive () and method for providing power from such to at least one auxiliary power supply () is disclosed. The drive may include a converter () and an inverter () connected by a DC bus (), and a controller () configured to apply at least one of unipolar modulation and bipolar modulation to the converter () and the inverter (), and to provide about half of the output voltage across the upper portion () of the DC bus () and about half of the output voltage across the lower portion () of the DC bus (), when the upper and lower portions () of the DC bus () are unevenly loaded. A first auxiliary power supply () may be connected to one of the upper and lower portions () of the DC bus () and may receive power from the multilevel regenerative drive ().

Multilevel drive half DC bus power supplies

A brake system for an elevator car includes a multiple of brake segments for deceleration of the elevator car and a brake control circuit operable to control operation of each of the multiple of brake segments to passively sequence activation of each of the multiple of brake segments.

Electromagnetic brake control circuitry for elevator application

A regenerative elevator drive device, a method for buffering energy of a regenerative elevator drive device, and an elevator system are disclosed. The regenerative elevator drive device may include an inverter having a plurality of power components and a converter having a plurality of power components. The regenerative drive may further include a direct current (DC) link bridging the inverter and the converter, the DC link including a first capacitor bridging the inverter and the converter and a second capacitor in parallel with the first capacitor. The regenerative elevator drive device may be a multi-level regenerative drive device.

Bus capacitor bank configuration for a regenerative drive

A regenerative drive device and a method for configuring the DC link of a regenerative drive device are disclosed. The multilevel regenerative drive device may include an inverter having a plurality of power components and a converter having a plurality of power components. The multilevel regenerative drive device may also include a direct current (DC) link bridging the inverter and the converter, the DC link including a capacitor, an inverter neutral point, and a converter neutral point independent of the inverter neutral point. Alternatively, the inverter neutral point and the converter neutral point may be connected.

Bus capacitor bank configuration for a multi-level regenerative drive

An exemplary power supply includes a low side switch and a high side switch. A driver controls operation of the high side switch. A bootstrap capacitor supplies power to the driver. An energy storage portion is in parallel with the bootstrap capacitor to provide control over whether a voltage of the bootstrap capacitor drops below a desired voltage. A voltage regulator is in parallel with the bootstrap capacitor for limiting current provided to the bootstrap capacitor and for regulating a voltage of the bootstrap capacitor.

Regulated bootstrap power supply

An exemplary power supply assembly includes a drive device having a bus capacitor. A switch associated with an input side of the drive device selectively connects the drive device to a power supply. An inductor has an impedance that limits an amount of current supplied to the bus capacitor during an initial charging of the bus capacitor when the switch connects the input side of the drive device to the power supply. A restrictive circuit portion dampens a resonance effect of the inductor. The restrictive circuit portion has a resistance that allows the bus capacitor to charge quickly. The impedance of the inductor has a more significant effect on how quickly the bus capacitor charges than an effect of the resistance. A dampening factor of the restrictive circuit controls a voltage of the bus capacitor during the charging of the bus capacitor.

Growing community of inventors

Plainville, CT, United States of America

Steven M Millett