Patent application number | Description | Published |
20090301819 | Elevator Motor Drive Tolerant of an Irregular Power Source - A hoist motor ( | 12-10-2009 |
20100006378 | ELEVATOR DRIVE SYSTEM INCLUDING RESCUE OPERATION CIRCUIT - A system continuously drives an elevator hoist motor during normal and power failure conditions. A regenerative drive delivers power from a main power supply to the hoist motor during normal operation. A rescue operation circuit includes a backup power supply and is operable in the event of a failure of the main power supply to disconnect the regenerative drive from the main power supply and connect the back up power supply to the regenerative drive to provide substantially uninterrupted power to the hoist motor. | 01-14-2010 |
20100044160 | AUTOMATIC RESCUE OPERATION FOR A REGENERATIVE DRIVE SYSTEM | 02-25-2010 |
20100116595 | MANAGEMENT OF POWER SOURCE VARIATIONS IN AN ELEVATOR DRIVE SYSTEM | 05-13-2010 |
20100288586 | ELEVATOR MACHINE MOTOR AND DRIVE AND COOLING THEREOF - Heat in a drive system including a motor and a drive is removed using heat pipes in heat exchanging contact with the motor and the drive. The heat conducting element have at least one portion for receiving heat from the motor or the drive, and another portion to transfer heat to a heat exchange device that is spaced from the motor and drive. The heat conducting element may be a heat pipe or a heat spreader element. | 11-18-2010 |
20110043273 | PULSE WIDTH MODULATION CONTROL OF A MATRIX CONVERTER - A matrix converter includes a plurality of switching elements and is adapted to receive a multi-phase alternating current (AC) input signal having an input frequency and to generate a multi-phase AC output signal having an output frequency. The phases of the input signal are sorted as a function of their instantaneous voltage amplitude ( | 02-24-2011 |
20110147130 | MANAGEMENT OF POWER FROM MULTIPLE SOURCES IN AN ELEVATOR POWER SYSTEM - Power is managed in an elevator system including an elevator hoist motor ( | 06-23-2011 |
20110226559 | BATTERY STATE-OF-CHARGE CALIBRATION - Calibration of the state-of-charge (SOC) of a battery-based energy storage system used with a regenerative drive uses an SOC-open circuit voltage (V?oc#191) correlation. The battery is partially charged or discharged to assure operation defined by V?oc#191 following a known V?oc#191-SOC profile, such as a charge or discharge boundary curve. The partial charging/discharging may be synchronized with a traffic profile of an elevator system driven by the regenerative drive. A V?oc#191 measurement is made, and by enhancing the relaxation dynamics of V?oc#191 through regulating battery usage with a reference to traffic profile, a V?oc#191 is estimated more reliably. Using the estimate V?oc#191 and the known V?oc#191-SOC profile, state-of-charge of the battery is determined. | 09-22-2011 |
20110235373 | ACTIVE SWITCHING RIPPLE FILTER - An active switching ripple filter system removes ripple currents from a power signal and has a main inverter and an active switching ripple filter inverter whose outputs are combined to form an output power signal. | 09-29-2011 |
20110247900 | OPERATON OF A THREE-PHASE REGENERATIVE DRIVE FROM MIXED DC AND SINGLE PHASE AC POWER SOURCES - A three-phase regenerative drive ( | 10-13-2011 |
20120261217 | REGENERATIVE DRIVE WITH BACKUP POWER SUPPLY - A system continuously drives a motor during normal and power failure operating conditions. A regenerative drive delivers power to the motor from a main power supply during the normal operating condition and from a backup power supply during the power failure operating condition. A controller operates the regenerative drive to provide available power on the regenerative drive to the backup power supply during the normal operating condition. | 10-18-2012 |
20130000342 | SOLAR POWER ASSISTED TRANSPORT REFRIGERATION SYSTEMS, TRANSPORT REFRIGERATION UNITS AND METHODS FOR SAME - A transport refrigeration system, comprising: a compressor ( | 01-03-2013 |
20130240302 | Method And System For Active Noise Or Vibration Control Of Systems - A system for active control of noise and/or vibration includes an electric machine; at least one sensor for sensing at least one of noise and vibration in the machine and generating at least one of an audio signal representing noise and a vibration signal representing vibration; a controller obtaining at least one of the noise signal and the vibration signal, the controller generating control signals to reduce at least one of noise and vibration in the machine; and power electronics receiving the control signals and generating drive signals for the machine. | 09-19-2013 |
20140260404 | HIGH EFFICIENCY REFRIGERATION SYSTEM - A refrigerant system includes a first, substantially outdoor, two phase heat transfer fluid vapor compression circulation loop including a compressor, a heat exchanger condenser, an expansion device, and the heat absorption side of a heat exchanger evaporator condenser, connected by conduit in a closed loop and having disposed therein a first heat transfer fluid having a critical temperature of greater than or equal to 31.2° C. The system also includes a second, at least partially indoor, two phase heat transfer fluid circulation loop that transfers heat to the first loop through the heat exchanger evaporator condenser. The second loop includes the heat rejection side of the heat exchanger evaporator condenser, a liquid pump, and a heat exchanger evaporator, connected by conduit in a closed loop and having disposed therein a second heat transfer fluid that has an ASHRAE Class A toxicity rating and an ASHRAE Class 1 or 2L flammability rating. | 09-18-2014 |
20140375233 | PERMANENT MAGNET MOTOR CONTROL - A three-phase permanent magnet motor is controlled by generating two-phase control signals. A rotation speed value is generated representing a rotation speed of the permanent magnet motor based on a q-current reference value and a q-current feedback value, the q-current reference value and the q-current feedback value corresponding to a q-phase winding. A d-phase voltage change value is generated based on a d-current reference value and a d-current feedback value, the d-current reference value and the d-current feedback value corresponding to the d-phase winding. A first d-phase voltage value is generated based on the rotation speed value, the d-phase voltage change value, the d-current reference value and the q-current reference value. A first q-phase voltage value is generated based on the rotation speed value, the q-current reference value and the d-current reference value. | 12-25-2014 |
20140376283 | SYSTEMS AND METHODS FOR ACTIVE DAMPING DEVICE FOR STABILIZING A POWER GRID OF ACTIVE SOURCES AND LOADS - Embodiments relate to systems and methods for an active damping device for stabilizing a power grid of active sources and loads. In power system networks or grids which incorporate active power sources and active loads, such as motors, the output voltage transfer function can exhibit instabilities due to the presence of poles in the positive real portion (right hand side) of the complex plane. Those poles can induce uncontrolled ringing, oscillations, or other artifacts or instabilities. According to implementations, an active damping element can be introduced into the power system grid, which operates to drive the poles of the output transfer function to the negative real (left hand) portion of the complex plane. Output voltage and other parameters can thereby be stabilized. In implementations, the damping element can include an R-C network for DC output systems, or a controller including a voltage source inverter for AC output systems. | 12-25-2014 |
20140376284 | SYSTEMS AND METHODS FOR TUNING THE CONTROL OF A SHUNT ACTIVE POWER FILTER OVER A VARIABLE FREQUENCY - Embodiments relate to systems and methods for tuning the control of a shunt active power filter over a variable frequency. In aspects, a shunt active power filter is provided to filter current harmonics from the output delivered to a dc load via a recitifier. The shunt active power filter control can be configured as a set of resonant regulators connected in a parallel configuration. Each of the resonant regulators can be tuned to dampen or eliminate a particular harmonic, such as the 5th, 7 | 12-25-2014 |