Michael L Todd

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

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.

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

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.

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

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.

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

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.

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

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.

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

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.

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

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.

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

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.