Vehicle-mounted electric rotating machine

• US 9,312,683 B2
• Filed: 10/15/2014
• Issued: 04/12/2016
• Est. Priority Date: 10/16/2013
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Nakayama, Hideaki, Horihata, Harumi
• Primary Examiner(s): Cuevas, Pedro J
• Application Number:
  US14/514,583
• Publication Number:
  US 20150102782A1
• Time in Patent Office: 545 Days
• Field of Search: 322/21, 322/23, 322/28, 322/94, 310/114
• US Class Current: 1/1
• CPC Class Codes: B60L 15/025 using field orientation; Vector control; Direct Torque Control [DTC]
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/429 Current
• CPC Class Codes: B60L 2240/529 Current
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: H02H 7/067 on occurrence of a load dump control on sudden change of load H02P9/10
• CPC Class Codes: H02J 11/00 Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: H02J 7/143 with multiple generators
• CPC Class Codes: H02J 7/163 with special means for initiating or limiting the excitation current
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034
• CPC Class Codes: H02M 1/32 Means for protecting converters other than automatic disconnection
• CPC Class Codes: H02P 2101/45 for motor vehicles, e.g. car alternators
• CPC Class Codes: H02P 9/10 Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
• CPC Class Codes: H02P 9/48 Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle H02P9/04 - H02P9/46 take precedence
• 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

Abstract

A vehicle-mounted electric rotating machine includes a field winding wound on a rotor for magnetizing a field pole of the rotor, a stator winding for generating an AC voltage in accordance with a rotating magnetic field generated by the field pole, a power converter for converting the AC voltage to a DC voltage and outputting the DC voltage through a first power supply line connected to an output terminal thereof, and a load dump handling section for performing a load dump protection operation when a voltage of the output terminal of the power converter exceeds a threshold voltage. The load dump handling section is supplied with operating power through a second power supply line provided separately from the first power supply line.

Claims

1. A vehicle-mounted electric rotating machine comprising:

a field winding wound on a rotor for magnetizing a field pole of the rotor;

a stator winding for generating an AC voltage in accordance with a rotating magnetic field generated by the field pole;

a power converter for converting the AC voltage to a DC voltage and outputting the DC voltage through a first power supply line connected to an output terminal thereof; and

a load dump handling section for performing a load dump protection operation when a voltage of the output terminal of the power converter exceeds a first threshold voltage, the load dump handling section being supplied with operating power through a second power supply line provided separately from the first power supply line.

2. The vehicle-mounted electric rotating machine according to claim 1, further comprising a power supply circuit for supplying the operating power to the load dump handling section,

the output terminal of the power converter being connected to a first battery through the first power supply line,

the power supply circuit being connected to a second battery provided separately from the first battery through the second power supply line.

3. The vehicle-mounted electric rotating machine according to claim 1, wherein the load dump handling section performs the load dump protection operation by reducing a power generation torque of the vehicle-mounted electric rotating machine, and increasing a reactive current flowing through the stator winding.

4. The vehicle-mounted electric rotating machine according to claim 1, wherein the load dump handling section performs the load dump protection operation by controlling a q-axis current flowing through the stator winding to zero, and controlling a d-axis current flowing through the stator winding to a predetermined value other than zero.

5. The vehicle-mounted electric rotating machine according to claim 1, wherein the power converter includes a bridge circuit having an upper arm and a lower arm connected in series for each of phase windings of the stator winding, at least one of the upper arm and lower arm being formed of a switching element, the load dump handling section performing the load dump protection operation by turning on the switching elements of all the upper arms or lower arms.

6. The vehicle-mounted electric rotating machine according to claim 1, wherein the load dump handling section terminates the load dump protection operation at a moment when the voltage of the output terminal of the power converter decreases below a second threshold voltage lower than the first threshold voltage.

7. The vehicle-mounted electric rotating machine according to claim 1, wherein the load dump handling section stops supply of a field current to the field winding while the load dump protection operation is performed, and terminates the load dump protection operation at a moment when a current actually flowing through the field winding becomes zero or a predetermined value.