A regenerative braking system includes a motor configured to rotate at a variable rotational speed in response to receiving power from a three-phase power supply, and a regenerative braking circuit in signal communication with the three-phase power supply to control the rotational speed of the motor. A brake controller is in signal communication with the regenerative braking circuit and is configured to selectively operate the regenerative braking circuit in a plurality of different braking modes based on the rotational speed of the motor.

Method and apparatus are disclosed for pre-fluxing motors of vehicle door e-latches. An example vehicle includes a door including a handle that includes a switch. The handle also includes an e-latch that includes a latch and a motor for the latch. Responsive to detecting grasping of the handle via the switch, the e-latch is to pre-flux the motor and transmit an authentication request. The example vehicle also includes a body control module to cause the motor to unlock the door via the latch responsive to authenticating a fob upon receiving the authentication request.

Method and apparatus are disclosed for pre-fluxing motors of vehicle door e-latches. An example vehicle includes a door including a handle that includes a switch. The handle also includes an e-latch that includes a latch and a motor for the latch. Responsive to detecting grasping of the handle via the switch, the e-latch is to pre-flux the motor and transmit an authentication request. The example vehicle also includes a body control module to cause the motor to unlock the door via the latch responsive to authenticating a fob upon receiving the authentication request.

The invention provides a separately excited direct current motor drive apparatus and electric equipment. The separately excited direct current motor drive apparatus includes: a separately excited direct current motor; a direct current power supply; an armature chopper; and a field chopper, wherein the armature chopper has m armature chopper units, each armature chopper unit has a pair of armature power output terminals and w armature switch control ends, the field chopper has n field chopper units, each field chopper unit has a pair of field power output terminals, the separately excited direct current motor has m pairs of armature external terminals and n pairs of field external terminals, the m pairs of armature external terminals are connected to the m pairs of armature power output terminals in a one-to-one correspondence manner, the n pairs of field external terminals are connected to the n pairs of field power output terminals in a one-to-one correspondence manner, m is a positive integer not less than 2, n is a positive integer not less than 2, and w is 1, 2 or 4.

The invention provides a separately excited direct current motor drive apparatus and electric equipment. The separately excited direct current motor drive apparatus includes: a separately excited direct current motor; a direct current power supply; an armature chopper; and a field chopper, wherein the armature chopper has m armature chopper units, each armature chopper unit has a pair of armature power output terminals and w armature switch control ends, the field chopper has n field chopper units, each field chopper unit has a pair of field power output terminals, the separately excited direct current motor has m pairs of armature external terminals and n pairs of field external terminals, the m pairs of armature external terminals are connected to the m pairs of armature power output terminals in a one-to-one correspondence manner, the n pairs of field external terminals are connected to the n pairs of field power output terminals in a one-to-one correspondence manner, m is a positive integer not less than 2, n is a positive integer not less than 2, and w is 1, 2 or 4.

The invention provides a separately excited direct current motor drive apparatus and electric equipment. The separately excited direct current motor drive apparatus includes: a separately excited direct current motor; a direct current power supply; an armature chopper; and a field chopper, wherein the armature chopper has m armature chopper units, each armature chopper unit has a pair of armature power output terminals and w armature switch control ends, the field chopper has n field chopper units, each field chopper unit has a pair of field power output terminals, the separately excited direct current motor has m pairs of armature external terminals and n pairs of field external terminals, the m pairs of armature external terminals are connected to the m pairs of armature power output terminals in a one-to-one correspondence manner, the n pairs of field external terminals are connected to the n pairs of field power output terminals in a one-to-one correspondence manner, m is a positive integer not less than 2, n is a positive integer not less than 2, and w is 1, 2 or 4.

The invention provides a separately excited direct current motor drive apparatus and electric equipment. The separately excited direct current motor drive apparatus includes: a separately excited direct current motor; a direct current power supply; an armature chopper; and a field chopper, wherein the armature chopper has m armature chopper units, each armature chopper unit has a pair of armature power output terminals and w armature switch control ends, the field chopper has n field chopper units, each field chopper unit has a pair of field power output terminals, the separately excited direct current motor has m pairs of armature external terminals and n pairs of field external terminals, the m pairs of armature external terminals are connected to the m pairs of armature power output terminals in a one-to-one correspondence manner, the n pairs of field external terminals are connected to the n pairs of field power output terminals in a one-to-one correspondence manner, m is a positive integer not less than 2, n is a positive integer not less than 2, and w is 1, 2 or 4.

A locomotive propulsion system onboard a locomotive platform includes a traction motor, a propulsion electrical storage device, an ancillary electrical storage device, and a controller. The propulsion electrical storage device is electrically connected to the traction motor via a propulsion circuit, and the ancillary electrical storage device is electrically connected to the traction motor via an ancillary circuit. The controller is configured to direct the ancillary electrical storage device to supply electric current to the traction motor via the ancillary circuit to power the traction motor during an elevated demand period. At an end of the elevated demand period, the controller is configured to control the ancillary circuit to stop conducting electric current from the ancillary electrical storage device and to direct the propulsion electrical storage device to supply electric current to the traction motor via the propulsion circuit to power the traction motor.

Method and apparatus are disclosed for pre-fluxing motors of vehicle door e-latches. An example vehicle includes a door including a handle that includes a switch. The handle also includes an e-latch that includes a latch and a motor for the latch. Responsive to detecting grasping of the handle via the switch, the e-latch is to pre-flux the motor and transmit an authentication request. The example vehicle also includes a body control module to cause the motor to unlock the door via the latch responsive to authenticating a fob upon receiving the authentication request.

Method and apparatus are disclosed for pre-fluxing motors of vehicle door e-latches. An example vehicle includes a door including a handle that includes a switch. The handle also includes an e-latch that includes a latch and a motor for the latch. Responsive to detecting grasping of the handle via the switch, the e-latch is to pre-flux the motor and transmit an authentication request. The example vehicle also includes a body control module to cause the motor to unlock the door via the latch responsive to authenticating a fob upon receiving the authentication request.