A motor includes a cooling enclosure. The cooling enclosure includes a cover body, an inner fan, and an outer fan. A first cooling cavity, a second cooling cavity, and an isolating cavity between the first cooling cavity and the second cooling cavity are formed in the cover body. A plurality of first and second cooling pipes are respectively disposed in the first and second cooling cavity; both being in communication with the isolating cavity and the outside. The cover body includes a first surface and an opposite second surface. The inner fan is disposed on the first surface. Sides of the inner fan are respectively in communication with the first and second cooling cavities. The inner fan is configured to provide circulating power for internal circulating air. The outer fan is in communication with the isolating cavity. The cooling enclosure and the motor can realize relatively high cooling efficiency.

A motor includes a cooling enclosure. The cooling enclosure includes a cover body, an inner fan, and an outer fan. A first cooling cavity, a second cooling cavity, and an isolating cavity between the first cooling cavity and the second cooling cavity are formed in the cover body. A plurality of first and second cooling pipes are respectively disposed in the first and second cooling cavity; both being in communication with the isolating cavity and the outside. The cover body includes a first surface and an opposite second surface. The inner fan is disposed on the first surface. Sides of the inner fan are respectively in communication with the first and second cooling cavities. The inner fan is configured to provide circulating power for internal circulating air. The outer fan is in communication with the isolating cavity. The cooling enclosure and the motor can realize relatively high cooling efficiency.

A motor control system to drive an alternating-current (AC) motor, including a motor drive with a power circuit and a motor drive controller powered by the power circuit and configured to cause the power circuit to generate a motor voltage; a motor drive contactor having first contacts electrically connected between the power circuit and the AC motor; a bypass contactor having second contacts electrically connected between a line voltage source and the AC motor; and a bypass controller communicatively coupled with the motor drive contactor and the bypass contractor; wherein the motor drive controller is structured to generate a speed reference and to command the bypass controller to connect the AC motor to the line voltage source upon the motor drive controller determining that the speed reference is substantially equal to a line frequency of the line voltage source.

A motor control system to drive an alternating-current (AC) motor, including a motor drive with a power circuit and a motor drive controller powered by the power circuit and configured to cause the power circuit to generate a motor voltage; a motor drive contactor having first contacts electrically connected between the power circuit and the AC motor; a bypass contactor having second contacts electrically connected between a line voltage source and the AC motor; and a bypass controller communicatively coupled with the motor drive contactor and the bypass contractor; wherein the motor drive controller is structured to generate a speed reference and to command the bypass controller to connect the AC motor to the line voltage source upon the motor drive controller determining that the speed reference is substantially equal to a line frequency of the line voltage source.

The invention specifies an electrical machine (1, 1a . . . 1c) which comprises a housing (8), a stator (5) which is arranged in the housing (8) and a rotor (3) which is rotatably mounted in the housing (8). At least one first coolant duct (9) of a first cooling circuit (15) and at least one second coolant duct (10, 10a, 10b) of a second cooling circuit (16) are arranged in the region of the stator (5) in the housing (8). In this case, the coolant ducts (9, 10, 10a, 10b) and the housing (8) form a heat exchanger between the first cooling circuit (15) and the second cooling circuit (16). In addition, the invention specifies a gear motor comprising the electrical machine (1, 1a . . . 1c), in which gear motor the transmission is hydraulically connected to the at least one second coolant duct (10, 10a, 10b) of the second cooling circuit (16). The invention also specifies a vehicle (27) which is driven by the said electrical machine (1, 1a . . . 1c) or by the said gear motor.

An efficient, low-noise power generation system may comprise a power generation trailer including a cooling subsystem. The cooling subsystem may include a plurality of cooling fans and a polygonal structure having an open top. The polygonal structure may comprise a plurality of vertical radiator cores arranged so as to form a polygon in which the plurality of radiator cores define side walls. The cooling fans may be mounted within the polygonal structure. The cooling subsystem may include a cooling fan motor for each fan and a cooling fan controller that controls operation of each cooling fan motor in response to at least one measured parameter, which may be the temperature of a fluid flowing through one or more radiator cores. At least one fan is oriented so as to push air out of the top of the polygonal structure. The polygonal structure may have four sides.

An efficient, low-noise power generation system may comprise a power generation trailer including a cooling subsystem. The cooling subsystem may include a plurality of cooling fans and a polygonal structure having an open top. The polygonal structure may comprise a plurality of vertical radiator cores arranged so as to form a polygon in which the plurality of radiator cores define side walls. The cooling fans may be mounted within the polygonal structure. The cooling subsystem may include a cooling fan motor for each fan and a cooling fan controller that controls operation of each cooling fan motor in response to at least one measured parameter, which may be the temperature of a fluid flowing through one or more radiator cores. At least one fan is oriented so as to push air out of the top of the polygonal structure. The polygonal structure may have four sides.

A generator enclosure for an engine-generator includes multiple walls defining at least one air path. In one example, a first wall includes an exhaust path for the engine-generator, and a second wall includes an intake path for the engine-generator. The generator enclosure may include at least one air flow frame associated with the exhaust path or the intake path and at least one movable wall supported by the at least one air flow frame, At least one thermal fuse may be coupled to the at least one movable wall and configured to release the at least one movable wall to block the exhaust path or the intake path.

A generator enclosure for an engine-generator includes multiple walls defining at least one air path. In one example, a first wall includes an exhaust path for the engine-generator, and a second wall includes an intake path for the engine-generator. The generator enclosure may include at least one air flow frame associated with the exhaust path or the intake path and at least one movable wall supported by the at least one air flow frame, At least one thermal fuse may be coupled to the at least one movable wall and configured to release the at least one movable wall to block the exhaust path or the intake path.

An active magnetic bearing apparatus for supporting a rotor of a rotary machine comprises an axial magnetic bearing unit and a radial magnetic bearing unit mounted directly to one another. One of the axial magnetic bearing unit and the radial magnetic bearing unit is mounted to a support for attachment to a housing of the rotary machine.