System and method for a cooling system

• US 7,479,757 B2
• Filed: 05/27/2005
• Issued: 01/20/2009
• Est. Priority Date: 05/27/2004
• Status: Active Grant

• Current Assignee: Siemens Large Drives LLC
• Original Assignee: Siemens Energy & Automation Incorporated (Siemens AG)
• Inventors: Ahmad, Raed H.
• Primary Examiner(s): Benson; Walter
• Assistant Examiner(s): COLON SANTANA, EDUARDO
• Application Number:
  US11/139,849
• Publication Number:
  US 20050276020A1
• Time in Patent Office: 1,334 Days
• Field of Search: 318/139, 318/376, 318/800, 318/808, 318/811, 180/65.3, 180/165, 701/19
• US Class Current: 318/811
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 2001/003 with means for cooling the electrical propulsion units
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 15/007 Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles
• CPC Class Codes: B60L 15/025 using field orientation; Vector control; Direct Torque Control [DTC]
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2200/40 Working vehicles
• CPC Class Codes: B60L 2210/20 AC to AC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2210/46 with more than three phases
• CPC Class Codes: B60L 2220/58 with more than three phases
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 2270/20 Inrush current reduction, i.e. avoiding high currents when connecting the battery
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/13 using AC generators and AC motors
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H02P 25/22 : Multiple windings; Windings for more than three phases
• CPC Class Codes: H02P 29/40 : Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load
• CPC Class Codes: H02P 5/74 : controlling two or more ac dynamo-electric motors H02P5/46, H02P5/60 take precedence
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

Abstract

Certain exemplary embodiments can comprise a system comprising an electric drive system for a machine. The system can comprise a rectifier adapted to convert AC power from an alternator to DC power. The system can comprise an inverter adapted to receive DC power from the rectifier and provide power to a traction motor and/or auxiliary devices. Certain exemplary embodiments can comprise a system and method for dissipating excess energy from a machine.

Claims

1. A system comprising:

an auxiliary power system for use in a mining machine comprising;

an active Insulated Gate Bipolar Transistor device adapted to, when the mining machine is under retard, receive a first AC signal from a traction motor and provide a first DC signal to a DC bus, and thereby function as a rectifier, said active Insulated Gate Bipolar Transistor device adapted to, when the mining machine is not under retard, receive a third DC signal from the DC bus and provide a second AC signal to the traction motor and thereby function as an inverter, transistors of said active Insulated Gate Bipolar Transistor device are switched by an information device;

a liquid-cooled heat sink adapted to receive a second DC signal from an active Insulated Gate Bipolar Transistor DC chopper, the active Insulated Gate Bipolar Transistor DC chopper adapted to receive the first DC signal and convert the first DC signal to the second DC signal;

a liquid pump adapted to move a cooling liquid over said heat sink;

a fan adapted to circulate air to cool the cooling liquid; and

applying two active vectors for a specific traction of a sampling interval to operate switches of said active Insulated Gate Bipolar Transistor device.

2. The system of claim 1, further comprising:

a liquid-to-air heat exchanger adapted to cool the cooling liquid; and

assigning a space vector modulation sampling interval to said active Insulated Gate Bipolar Transistor device, the sampling interval smaller than ⅙

cycle of an intended output fundamental of said active Insulated Gate Bipolar Transistor device, the space vector modulation sampling interval used to operate switches of said active Insulated Gate Bipolar Transistor device.

3. The system of claim 1, wherein:

the cooling liquid comprises water.

4. The system of claim 1, wherein:

the cooling liquid comprises glycol.

5. The system of claim 1, wherein:

the mining machine is a haul mining truck.

6. The system of claim 1, wherein:

the mining machine is a mining excavator.

7. The system of claim 1, wherein:

said heat sink is mechanically fastened to the active Insulated Gate Bipolar Transistor device.

8. The system of claim 1, further comprising:

a temperature sensor adapted to measure a temperature of the cooling liquid; and

recomputing vector components at times that are integer multiples of a sampling interval, said vector components used to operate switches of said active Insulated Gate Bipolar Transistor device.

9. The system of claim 1, wherein:

a temperature sensor adapted to measure a temperature of the cooling liquid; and

a controller adapted to de-rate power responsive to the temperature exceeding a predetermined threshold.

10. The system of claim 1, further comprising:

the traction motor; and

operating switches of said active Insulated Gate Bipolar Transistor device at a frequency of approximately 15 times an intended fundamental output frequency of said active Insulated Gate Bipolar Transistor device.

11. A method comprising a plurality of activities, said activities comprising:

from an active Insulated Gate Bipolar Transistor device functioning as a rectifier, when an associated machine is under retard, receiving a first DC signal at a DC bus, said active Insulated Gate Bipolar Transistor device adapted to, when the machine is not under retard, receive a third DC signal from the DC bus and provide a second AC signal to a traction motor and thereby function as an inverter, transistors of said active Insulated Gate Bipolar Transistor device are switched by an information device;

receiving the first DC signal at an active Insulated Gate Bipolar Transistor chopper associated with a mining machine;

providing a second DC signal from the active Insulated Gate Bipolar Transistor chopper to a liquid-cooled heat sink;

pumping a cooling liquid adapted to cool the heat sink;

circulating air to cool the cooling liquid via a fan; and

applying two active vectors for a specific fraction of a sampling interval to operated switches of said active Insulated Gate Bipolar Transistor device.

12. The method of claim 11, further comprising:

pumping the cooling liquid to a liquid-to-air heat exchanger adapted to cool the cooling liquid.

13. The method of claim 11, wherein:

the cooling liquid comprises water.

14. The method of claim 11, wherein:

the cooling liquid comprises glycol.

15. The method of claim 11, wherein:

the machine is a haul mining truck.

16. The method of claim 11, wherein:

mechanically fastening the heat sink to the active Insulated Gate Bipolar Transistor device.

17. The method of claim 11, further comprising:

via a temperature sensor, measuring a temperature of the cooling liquid.