MICHAEL SCOTT TODD
Engineering in York, PA
License number
Pennsylvania ET016774
Category
Engineers
Type
Engineer in Training
Address
Address
York, PA 17407
Professional information
Variable Speed Drive For Permanent Magnet Motor
US Patent:
8193756, Jun 5, 2012
Filed:
Oct 2, 2009
Appl. No.:
12/572864
Inventors:
Ivan Jadric - York PA, US
Zhiqiao Wu - York PA, US
Michael S. Todd - Jacobus PA, US
Justin Drew Warner - Harrisburg PA, US
Shreesha Adiga Manoor - York PA, US
Konstantin Borisov - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Zhiqiao Wu - York PA, US
Michael S. Todd - Jacobus PA, US
Justin Drew Warner - Harrisburg PA, US
Shreesha Adiga Manoor - York PA, US
Konstantin Borisov - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Assignee:
Johnson Controls Technology Company - Holland MI
International Classification:
H02P 7/00, H02P 27/00, G05B 5/01, G05B 11/01
US Classification:
318716, 318448, 318623, 318629
Abstract:
A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive is arranged to receive an input AC voltage at a fixed AC input voltage and provide an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link filters and stores the DC voltage from the converter. An inverter is connected to the DC link. A motor connectable to the compressor for powering the compressor. An active filter connected in parallel with the motor. The active filter is arranged to generate high frequency currents having a magnitude and opposite polarity, with respect to the output AC power of the variable speed drive. The high frequency currents generated by active filter substantially cancel out high frequency currents flowing into the motor.
Variable Speed Drive For Permanent Magnet Motor
US Patent:
8286439, Oct 16, 2012
Filed:
Oct 2, 2009
Appl. No.:
12/572883
Inventors:
Zhiqiao Wu - York PA, US
Ivan Jadric - York PA, US
Michael S. Todd - Jacobus PA, US
Justin Drew Warner - Harrisburg PA, US
Shreesha Adiga Manoor - York PA, US
Konstantin Borisov - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Ivan Jadric - York PA, US
Michael S. Todd - Jacobus PA, US
Justin Drew Warner - Harrisburg PA, US
Shreesha Adiga Manoor - York PA, US
Konstantin Borisov - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Assignee:
Johnson Control Technology Company - Holland MI
International Classification:
F25B 49/00
US Classification:
622281, 622284
Abstract:
A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive is arranged to receive an input AC power at a fixed AC input voltage and fixed input frequency and provide an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link is arranged to filter and store the DC voltage from the converter. A first inverter and a second inverter are each connected to the DC link. A motor includes stator windings connected between the first inverter and the second inverter to power the motor by the output AC power from the first inverter and the second inverter. The motor is connectable to a compressor of the chiller system to power the compressor. The motor may be a permanent magnet synchronous motor.
Variable Speed Drive With Pulse-Width Modulated Speed Control
US Patent:
8336323, Dec 25, 2012
Filed:
Oct 2, 2009
Appl. No.:
12/572915
Inventors:
Konstantin Borisov - York PA, US
Zhiqiao Wu - York PA, US
Michael S. Todd - Jacobus PA, US
Justin Drew Warner - Harrisburg PA, US
Shreesha Adiga Manoor - York PA, US
Ivan Jadric - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Zhiqiao Wu - York PA, US
Michael S. Todd - Jacobus PA, US
Justin Drew Warner - Harrisburg PA, US
Shreesha Adiga Manoor - York PA, US
Ivan Jadric - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Assignee:
Johnson Controls Technology Company - Holland MI
International Classification:
F25B 49/00
US Classification:
622281, 622284, 62229, 62230
Abstract:
A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive receives an input AC power at a fixed input AC voltage and a fixed input frequency, and provides an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter and configured to filter and store the DC voltage from the converter. An inverter is connected to the DC link. A motor is connectable to the compressor for powering the compressor. A controller is arranged to control switching in the converter and the inverter. The controller is arranged to apply randomized pulse width modulation to vary the switching frequency of transistors in the converter and the inverter at each switching cycle. The motor may be a permanent magnet synchronous motor.
Grounding System And Apparatus
US Patent:
2011010, May 5, 2011
Filed:
Jul 8, 2009
Appl. No.:
12/999818
Inventors:
Konstantin Borisov - York PA, US
Michael S. Todd - Jacobus PA, US
Ivan Jadric - York PA, US
Michael S. Todd - Jacobus PA, US
Ivan Jadric - York PA, US
Assignee:
JOHNSON CONTROLS TECHNOLOGY COMPANY - Holland MI
International Classification:
H02P 27/04, H01R 3/00
US Classification:
318808, 307109
Abstract:
A grounding system for a semiconductor module of a variable speed drive includes a first conductive layer, a second conductive layer; a substrate disposed between the first conductive layer and the second conductive layer; and a base attached to the second conductive layer, the base being connected to earth ground via a grounding harness. The first conductive layer is in electrical contact with the semiconductor module and the substrate, and electrically insulated from the second conductive layer by the substrate. The second conductive layer is in electrical contact with the substrate and disposed between the substrate and the base in electrical communication with an earth ground. The first conductive layer, the substrate and the second conductive layer form a capacitance path between the semiconductor module and the base as well as electrical conductors and the base for reduction circulating currents within the semiconductor module.
Control Method For Vapor Compression System
US Patent:
8353174, Jan 15, 2013
Filed:
Oct 2, 2009
Appl. No.:
12/572975
Inventors:
Ivan Jadric - York PA, US
Zhiqiao Wu - York PA, US
Michael S. Todd - Jacobus PA, US
Justin Drew Warner - Harrisburg PA, US
Shreesha Adiga Manoor - York PA, US
Konstantin Borisov - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Zhiqiao Wu - York PA, US
Michael S. Todd - Jacobus PA, US
Justin Drew Warner - Harrisburg PA, US
Shreesha Adiga Manoor - York PA, US
Konstantin Borisov - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Assignee:
Johnson Controls Technology Company - Holland MI
International Classification:
F25B 1/00, H02P 25/00, G05B 13/02
US Classification:
622284, 318801, 700 28
Abstract:
A chiller system is provided with a compressor, a condenser, and an evaporator connected in a closed refrigerant loop. A motor is connected to the compressor to power the compressor. A variable speed drive is connected to the motor. The variable speed drive is arranged to receive an input AC power at a fixed input AC voltage and a fixed input frequency and provide an output power at a variable voltage and variable frequency to the motor. The variable voltage has a maximum voltage greater in magnitude than the fixed input AC voltage and the variable frequency has a maximum frequency greater than the fixed input frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage, the converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link is arranged to filter and store the DC voltage from the converter.
Permanent Magnet Synchronous Motor And Drive System
US Patent:
8258664, Sep 4, 2012
Filed:
Oct 2, 2009
Appl. No.:
12/572947
Inventors:
Justin D. Warner - York PA, US
Ivan Jadric - York PA, US
Michael S. Todd - Jacobus PA, US
Zhiqiao Wu - York PA, US
Shreesha Adiga Manoor - York PA, US
Konstantin Borisov - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Ivan Jadric - York PA, US
Michael S. Todd - Jacobus PA, US
Zhiqiao Wu - York PA, US
Shreesha Adiga Manoor - York PA, US
Konstantin Borisov - York PA, US
Scott Victor Slothower - Dillsburg PA, US
Kanishk Dubey - York PA, US
John C. Hansen - Spring Grove PA, US
Assignee:
Johnson Controls Technology Company - Holland MI
International Classification:
H02K 21/00
US Classification:
310112, 31016515, 31015621, 310216137
Abstract:
A hybrid motor for powering a compressor of a chiller system includes a first rotor portion and a first stator portion configured as a permanent magnet motor and a second rotor portion and a second stator portion configured as a reluctance motor. The second rotor portion includes a reluctance-type rotor, and the second stator portion includes electromagnetic windings capable of inducing a rotary magnetic field. The first rotor portion and the second rotor portion are attached to a common drive shaft. The reluctance motor is arranged to generate start-up torque and initiate rotation of the drive shaft until the drive shaft achieves a predetermined rotational speed. The permanent magnet motor is arranged to power the drive shaft between the predetermined rotational speed and a maximum rotational speed.
Variable Speed Drive
US Patent:
2013002, Jan 31, 2013
Filed:
May 4, 2010
Appl. No.:
13/640322
Inventors:
Michael S. Todd - Jacobus PA, US
Ivan Jadric - York PA, US
Ivan Jadric - York PA, US
Assignee:
JOHNSON CONTROLS TECHNOLOGY COMPANY - Holland MI
International Classification:
H02P 27/00
US Classification:
3184003
Abstract:
A converter module for a variable speed drive having a semiconductor device for precharge is described. The precharge circuit includes switching modules, one switching module with a first semiconductor switch connected in parallel or series with a second semiconductor switch. The second semiconductor switch is switched on and off during the precharge operation in order to limit the inrush current into the DC Link. After the precharge operation, the second semiconductor switch is turned on all the time and acts like a diode. The second semiconductor device may have a lower maximum current rating than the main semi-conductor devices. The lower current rated semiconductor device experience the same short circuit current as the higher current rated semiconductor device. The lower current rated semiconductor device can be supplied with a larger gate to emitter voltage than the higher current rated semiconductor device to equalize current between semiconductor devices.
Variable Speed Drive
US Patent:
8174853, May 8, 2012
Filed:
Feb 24, 2011
Appl. No.:
13/034308
Inventors:
Ajit W. Kane - Dover PA, US
Ivan Jadric - York PA, US
Michael Todd - Jacobus PA, US
Konstantin Borisov - York PA, US
Ivan Jadric - York PA, US
Michael Todd - Jacobus PA, US
Konstantin Borisov - York PA, US
Assignee:
Johnson Controls Technology Company - Holland MI
International Classification:
H02M 1/12
US Classification:
363 40, 363 44
Abstract:
Systems and methods for improved VSDs are provided. One embodiment relates to an apparatus for common mode and differential mode filtering for motor or compressor bearing protection when operating with VSDs, including conducted EMI/RFI input power mains mitigation. Another embodiment relates to a method to extend the synchronous operation of an Active Converter to the AC mains voltage during complete line dropout. Another embodiment relates to an Active Converter-based Variable Speed Drive system with Improved Full Speed Efficiency.
Cooling Member
US Patent:
8149579, Apr 3, 2012
Filed:
Mar 28, 2008
Appl. No.:
12/057787
Inventors:
Ivan Jadric - York PA, US
Stephen M. Hoover - York PA, US
Kathleen S. Rogers - Dallastown PA, US
Michael S. Todd - Jacobus PA, US
Stephen M. Hoover - York PA, US
Kathleen S. Rogers - Dallastown PA, US
Michael S. Todd - Jacobus PA, US
Assignee:
Johnson Controls Technology Company - Holland MI
International Classification:
H05K 7/20
US Classification:
361699, 257714, 165 804, 361702, 361704, 361715
Abstract:
A cooling member for a variable speed drive. The variable speed drive has a component that generates heat during operation of the drive and a base. The base has a surface that receives the component, a channel formed in the surface of the base and a passageway formed in the base and receiving fluid therethrough. Fluid flowing through the passageway provides cooling to the component and the base is manufactured from an injection molding process.
Cooling Member
US Patent:
8495890, Jul 30, 2013
Filed:
Dec 2, 2009
Appl. No.:
12/629523
Inventors:
Ivan Jadric - York PA, US
Steve M. Hoover - York PA, US
Kathleen S. Rogers - Dallastown PA, US
Michael S. Todd - Jacobus PA, US
Mathias R. Fox - Zeeland MI, US
Christopher J. Keizer - Grandville MI, US
Ronald C. Perry - Jenison MI, US
Matthew T. Boerma - Holland MI, US
Justin D. Warner - Harrisburg PA, US
Scott V. Slothower - Dillsburg PA, US
Julie S. Muszynski - York PA, US
David J. Laforme - York Haven PA, US
Steve M. Hoover - York PA, US
Kathleen S. Rogers - Dallastown PA, US
Michael S. Todd - Jacobus PA, US
Mathias R. Fox - Zeeland MI, US
Christopher J. Keizer - Grandville MI, US
Ronald C. Perry - Jenison MI, US
Matthew T. Boerma - Holland MI, US
Justin D. Warner - Harrisburg PA, US
Scott V. Slothower - Dillsburg PA, US
Julie S. Muszynski - York PA, US
David J. Laforme - York Haven PA, US
Assignee:
Johnson Controls Technology Company - Holland MI
International Classification:
F25D 23/12
US Classification:
622592
Abstract:
A cooling member for a variable speed drive is disclosed. The cooling member includes including at least two channels, each channel including at least one inlet and at least one outlet, a first passageway configured to provide fluid to the at least two channels through the at least one inlet of each channel, a second passageway configured to receive fluid from the at least one outlet of each channel the at least two channels, and a connector to connect the cooling member to a second cooling member.