Abstract: An electric drive pump system includes a power end and a detachable transmission assembly. The transmission assembly is mounted to the power end and is configured to provide rotational power to the power end through a plurality of electric motors. The plurality of electric motors use a gearbox to drive an output spline that engages the power end. A control module is used to regulate the performance characteristics of the plurality of electric motors. A temperature regulation assembly is configured to regulate the temperature of the transmission assembly and the power end.

Abstract: A motor/generator/transmission system includes: an axle; a stator ring having a plurality of stator coils disposed around the periphery of the stator ring, wherein each phase of the plurality of stator coils includes a respective set of multiple parallel non-twisted wires separated at the center tap with electronic switches for connecting the parallel non-twisted wires of each phase of the stator coils all in series, all in parallel, or in a combination of series and parallel; a rotor support structure coupled to the axle; a first rotor ring and a second rotor ring each having an axis of rotation coincident with the axis of rotation of the axle, at least one of the first rotor ring or the second rotor ring being slidably coupled to the rotor support structure and configured to translate along the rotor support structure in a first axial direction or in a second axial direction.

Abstract: An inverter assembly for an electric vehicle. The inverter assembly includes three inverters driving at least one wheel of the vehicle. Each inverter has a different phases angle relative to the other inverters in order to minimize current ripple and reduce the capacitor size to allow a smaller package for the inverter assembly.

Abstract: Systems and methods for reducing inertial forces of a reciprocating piston internal combustion engine are described. The systems and methods may provide for counterweights in a form of pistons in cylinders that are moved via electromagnets. The counterweights may be moved at a frequency that corresponds to engine speed via an alternating current.

Abstract: A hybrid vehicle includes: an engine including an output shaft configured to output a power; a damper placed on a first axis that is the same axis as the output shaft; a rotating machine placed on the first axis; a torque converter placed on the first axis; a transmission mechanism placed so that an input shaft of the transmission mechanism is positioned on a second axis that is an axis different from the first axis; a case in which the rotating machine and the transmission mechanism are accommodated; driving wheels attached to drive shafts; and an oil accumulated in a lower part of a space surrounded by the case and used for lubrication of the transmission mechanism, the oil being in contact with a part of the rotating machine.

Abstract: An integrated hybrid power system for a work vehicle includes an engine and an electric machine. The power system also includes a transmission configured to transfer mechanical power between the engine and the electric machine. The transmission, in a first configuration, is configured to transfer mechanical power in a first direction from the electric machine to the engine to start the engine. Furthermore, the transmission, in a second configuration, is configured to transfer mechanical power in the first direction and, alternatively, in a second direction from the engine to the electric machine after the engine is started.

Abstract: A mining machine including a bi-directional electrical bus, a power source coupled to the bi-directional electrical bus, a motor coupled to the bi-directional electrical bus, the motor powered by energy available on the bi-directional electrical bus, a kinetic energy storage system coupled to the bi-directional electrical bus and a controller. The controller is configured to communicate with the kinetic energy storage system and the power source. Wherein the controller is configured to operate the kinetic energy storage system as a primary power source for the bi-directional electrical bus and to operate the power source as a secondary power source for the bi-directional electrical bus when the kinetic energy storage system cannot satisfy an energy demand on the bi-directional electrical bus.

Abstract: Provided is a driving force transmission device including: an actuator (22) that, in a case where one of a first annular gear (11), a second annular gear (14), and a carrier (16) is an input member, another one is an output member, and the remaining one is a rotational member, causes one of the input member and the output member to rotate integrally with the rotational member. When driving force is inputted from the drive source to the input member and input member is rotated unidirectionally, the rotation direction of the output member in the case where one of the input member and the output member rotates integrally with the rotational member is reversed with respect to that in a case where one of the input member and the output member does not rotate integrally with the rotational member.

Abstract: A power source for an implement used to perform a welding or cutting operation, the power source including an engine component including a generator and a rectifier electrically connected to the generator and adapted to convert alternating current provided by the generator to a direct current, the engine component being switchable between an on condition and an off condition; at least one battery, wherein the engine component and at least one battery are electrically connected to a chopper bus; and a controller in communication with the generator, chopper bus, operation chopper, and the charging switch; an auxiliary power converter including at least one of a DC to AC and a DC to DC converter, the auxiliary power converter being electrically connected to the operation chopper and the at least one battery.

Abstract: The present disclosure is directed to an electric generator and motor transmission system that is capable of operating with high energy, wide operating range and extremely variable torque and RPM conditions. In accordance with various embodiments, the disclosed system is operable to: dynamically change the output “size” of the motor/generator by modularly engaging and disengaging rotor/stator sets as power demands increase or decrease; activate one stator or another within the rotor/stator sets as torque/RPM or amperage/voltage requirements change; and/or change from parallel to series winding configurations or the reverse through sets of 2, 4, 6 or more parallel, three-phase, non-twisted coil windings with switchable separated center tap to efficiently meet torque/RPM or amperage/voltage requirements.

Abstract: A control apparatus for an internal combustion engine is provided which works to control an electric motor to start the engine through a belt transmission system. The control apparatus restricts rotation of the electric motor so as to keep a speed of the electric motor below a speed at which the electric motor is capable of producing a maximum torque until a given period of time passes since the electric motor is actuated to start in the motor mode. This enables the electric motor to generate the maximum torque when it is required to crank the engine.

Abstract: An electric motor control system for a vehicle includes a vehicle speed module that determines a vehicle speed. A target speed module selectively transitions a target vehicle speed to zero over a period in response a driver actuating an input device. The input device is not an accelerator pedal or a brake pedal. A switching control module, based on a difference between a target vehicle speed and the vehicle speed, controls switching of an inverter to control application of power to an electric motor of the vehicle.

Abstract: A motor/generator/transmission system includes: an axle; a stator ring having a plurality of stator coils disposed around the periphery of the stator ring, wherein each phase of the plurality of stator coils includes a respective set of multiple parallel non-twisted wires separated at the center tap with electronic switches for connecting the parallel non-twisted wires of each phase of the stator coils all in series, all in parallel, or in a combination of series and parallel; a rotor support structure coupled to the axle; a first rotor ring and a second rotor ring each having an axis of rotation coincident with the axis of rotation of the axle, at least one of the first rotor ring or the second rotor ring being slidably coupled to the rotor support structure and configured to translate along the rotor support structure in a first axial direction or in a second axial direction.

Abstract: A drive train of a motor vehicle, with a hybrid drive having an internal combustion engine, and an electric machine, and an automated auxiliary range transmission, wherein the automated auxiliary range transmission has at least one main transmission and an auxiliary range unit mounted downstream of the main transmission, in particular as a range group, wherein an input shaft of the automated auxiliary range transmission is connected to the internal combustion engine of the hybrid drive via a controllable starter clutch, and an axle shaft of the automated auxiliary range transmission is connected to an axle drive, wherein the electric machine of the hybrid drive can be coupled to the force flux or torque flux of the drive train between the main transmission and the auxiliary range unit and/or between the auxiliary range unit and the axle drive.

Abstract: Disclosed are a vehicle power generation control method and an apparatus thereof, wherein, when conditions: a gear is in a target gear state, the gear is in a locked state, a handbrake is in a parking state, opening of an accelerator is in a zero state, an emergency stop switch is in a state of sending a signal, and a temperature of a generator is in a state of a working temperature are established at the same time, the vehicle awaits orders to switch to the power generation mode, otherwise a warning signal is sent. After the vehicle enters into the power generation mode to make the generator generate power to supply power, when the conditions aforementioned are established at the same time, the power generation action is continuously performed, and electricity is cut off from the vehicle when any one of the conditions is not established.

Abstract: A rotary electric machine apparatus includes a drive motor and a power generator. The drive motor and the power generator each include a stator. The stator includes a stator core and stator coils. The stator core has a plurality of slots which extend through the stator in an axis direction of the stator and which are disposed in a circumferential direction of the stator with a predetermined interval. The stator coils for a plurality of phases are each disposed in the plurality of slots as a distributed winding. The drive motor is provided such that a shift direction of the stator coils and a torque direction of the drive motor are opposite to each other. The power generator is provided such that the shift direction of the stator coils and a torque direction of the power generator are a same as each other.

Abstract: In a control apparatus of the present invention, when a predetermined engagement condition is satisfied while an internal combustion engine is operated, first a rotating speed control which makes a first MG output a torque so that a rotating speed of the first MG becomes zero is executed, and subsequently an engagement control which switches a state of a lock mechanism to an engagement state is executed when an engagement switching condition is satisfied during execution of the rotating speed control. When a temperature of a first inverter of the first MG becomes equal to or higher than an engagement prohibition temperature which is lower than a working upper limit temperature during the execution of the rotating speed control, the execution of the engagement control is prohibited.

Abstract: A regenerative control capable of realizing a comfortable operation, along with an efficient collection of a regenerative energy of a motor generator and an effective regenerative braking control. A regenerative control device for a motor generator generates a regenerative braking power for decelerating a motor vehicle at a time of collecting regenerative energy generated by driving of the motor vehicle. The arrangement includes a driving state detection unit for detecting a driving state and a deceleration level acquisition unit for acquiring a deceleration level. A braking force setting unit sets the regenerative braking force of the motor generator at a time of detection of a deceleration operation by the driving state detection unit. A braking force adjustment unit adjusts and suppresses the regenerative braking force set by the braking force setting unit, according to acquired deceleration level.

Abstract: A wind turbine rotor assembly comprises: a rotor support; a rotor which is rotatably mounted to the rotor support; and a base support; wherein the rotor support and base support are provided with an engagement mechanism which allows the rotor support and base support to engage with each other so that when the rotor support and base support are moved together a hinged connection is formed between the rotor support and base support, which hinged connection allows the rotor support to rotate relative to the base support during installation or decommissioning of the rotor.

Abstract: A powertrain includes an engine with a crankshaft rotating on a first axis, motor/generator unit (MGU), belted drive system, transmission, actuator assembly, and controller. An MGU rotor shaft rotates about a second axis. The belted drive assembly has a first pulley connected to the crankshaft, a second pulley selectively connected to the rotor shaft, and an endless rotatable drive element that connects the pulleys. The transmission is connected to the flywheel via an input clutch. The actuator assembly has a third axis parallel to the first and second axes, a linear actuator(s), pinion gears translatable along the third axis to selectively engage the first and second gear elements, and overrunning clutches to passively disengage the pinion gears from the first or second gear element. The controller transmits control signals to the MGU and linear actuators to command a control state via translation of the pinion gears.

Abstract: A method according to an exemplary aspect of the present disclosure includes, among other things, controlling an electrified vehicle by engaging a parking brake if a battery state of charge is depleted below a predefined threshold.

Abstract: A wave power generation system comprises a heavy plate; an expansion pipe installed on a top of the heavy plate; a motion module installing on a top of the expansion pipe; a buoy installing on a top of the motion module, a top end of the motion module through the buoy and the top end connected to the buoy; and a motion control module having a base installing in the heavy plate; a driving unit installed in the base; and multiple blades coupled to the driving unit.

Abstract: A method for operating a hybrid vehicle, the vehicle being driven by at least two power plants, and at least one electric power plant charging a high voltage energy system which supplies a low voltage energy system with electrical energy, a high voltage being converted into a low voltage for supplying at least one control unit of the vehicle, and the vehicle being disconnected from the electric power plant when a fault is detected in the high voltage system. To maintain the energy supply to the control units via the low voltage system even in the event of a fault in the high voltage system, the power plant is placed in a state for generating a voltage which is uncritical for the safety of the user after the high voltage system is disconnected, the safety-uncritical voltage being converted into the low voltage for supplying the at least one control unit.

Abstract: A hybrid module for a drive train of a vehicle, including a first disconnect clutch (2), an electric motor (4), and a second disconnect clutch (1). The first disconnect clutch (2) is disposed in the torque flow path between a combustion engine (3) in the drive train and the electric motor (4), while the second disconnect clutch (1) is disposed in the torque flow path between the electric motor (4) and a transmission (6, 7) in the drive train. The first disconnect clutch (2) and the second disconnect clutch (1) are disposed in a joint wet chamber.

Abstract: A hybrid engine control system comprises a hybrid engine control module and a torque mitigation module. The hybrid engine control module selectively stops an internal combustion engine (ICE). The hybrid engine control module selectively starts the ICE based upon driver inputs and non-driver inputs. The torque mitigation module reduces torque transfer from the ICE to a driveline while the ICE is started based upon the non-driver inputs and maintains torque transfer from the ICE to the driveline while the ICE is started based upon the driver inputs. A method comprises selectively stopping an internal combustion engine (ICE); selectively starting the ICE based upon driver inputs and non-driver inputs; reducing torque transfer from the ICE to a driveline while the ICE is started based upon the non-driver inputs; and maintaining torque transfer from the ICE to the driveline while the ICE is started based upon the driver inputs.

Abstract: When a battery pack having an output voltage of 14.4 V that is connectable to an electric tool in a sliding manner is used as a power supply source for the electric tool that is connectable to a battery pack in an insertion manner and has a rated voltage of 12 V, the electric tool and the battery pack are connected to each other with an adaptor interposed therebetween. The adaptor has an FET that is switched at a predetermined duty of a predetermined frequency. The battery pack and the electric tool are connected or disconnected to or from each other by the switching operation, thereby dropping the output voltage of the battery pack. When the detected voltage is out of a predetermined value range, it is judged that the overcurrent or overdischarge has occurred. Then, the FET is turned off to stop the electric tool.

Abstract: A system (for controlling cooling of an alternator) comprises a control system, an alternator, and a blower fan, the alternator having a stator and a rotor. The control system is adapted to estimate one or more temperatures of the stator and/or rotor of the alternator using a thermal model. The control system is also adapted to control the blower fan to cool the alternator by providing a specified amount of air flow across the stator and rotor of the alternator, based on the estimated one or more temperatures of the stator and/or rotor.

Abstract: A regenerative electricity system that can be installed in an electric vehicle to recharge the batteries with the movement of the vehicle while it is driven.

Abstract: A range extender for a motor vehicle is disclosed. In one aspect, the range extender includes a first electromechanical energy converter including a rotor and an internal combustion engine configured to be coupled to the first electromechanical energy converter for transmitting power. The range extender further includes a first vibration damper integrated into the rotor of the first electromechanical energy converter.

Abstract: According to an embodiment, a method of operating a wind turbine comprising a DC-to-AC voltage converter is provided, the wind turbine being connectable to a grid via the DC-to-AC voltage converter, the method comprising: determining a line voltage of a power line connecting the DC-to-AC voltage converter to the grid; if the determined line voltage exceeds a predefined voltage threshold value, injecting reactive current into the power line, wherein the amount of reactive current injected is chosen such that an output voltage of the DC-to-AC voltage converter is kept within a predetermined voltage range.

Abstract: A device for supplying electrical power to an aircraft on the ground, including two electric generators driven by an auxiliary power unit. The first generator is connected by a connection/disconnection mechanism to an aircraft network and to an electric taxiing network, to supply either an AC voltage to the aircraft network when it is connected to the aircraft network, or an AC voltage or a power to the taxiing network when it is connected to the taxiing network. The second generator is connected by the connection/disconnection mechanism to the aircraft or taxiing networks to supply the AC voltage to one of those networks.

Abstract: A vehicle (100) includes a motor generator (130) generating driving power for running the vehicle (100), and an ECU (300) for controlling the motor generator (130). The ECU (300) causes driving power variation operation to be performed on the motor generator (130) in which the motor generator is switched between a first state (low output state) in which the motor generator generates driving power of a prescribed level and a second state (high output state) in which the motor generator generates driving power larger than the driving power in the first state to run the vehicle (100). As a result, energy efficiency of the vehicle (100) is improved.

Abstract: A method of operating a rotor-blade pitch controlling drive of a wind turbine comprising supplying electrical energy to an electrical working load by a primary electrical energy supply, charging an electrical energy storage device by means of a charger, supplying electrical energy to the electrical working load by the electrical energy storage device if the primary electrical supply fails, and temporally disconnecting the electrical energy storage device from the charger in successive intervals, while applying an electric test load to the electrical energy storage device and observing the electrical discharge of the electrical energy storage device.

Abstract: A power storage device is electrically connected to a first input and output end located on the opposite side of a direct-current common section in a second power converter. According to an input form of electric power, a first power converter operates as a DC/AC converter or an AC/DC converter. The second power converter operates as a DC/AC converter, an AC/DC converter, or a DC/DC converter. The power storage device is charged using direct-current power supplied from the direct-current common section or the first input and output end side. The power storage device discharges desired direct-current power to the direct-current common section or the first input and output end side.

Abstract: A cable transportation system has rails and a draw cable, both extending along a transportation path, a drive member for driving the draw cable; at least one vehicle, which moves along the transportation path and has wheels which roll along the rails, and a coupling device for connecting the vehicle to the draw cable, at least one passenger station where the vehicle is stopped and an electric machine located on the vehicle and driven by the wheels to generate electric power.

Abstract: A wind power generator generates power through a rotation of a rotor and is interconnected, and operated with its power generation output previously limited in order to be able to further supply the power to a power system in response to a decrease in system frequency. Thus, a concentrated control system derives a required restricted amount corresponding to a power generation output required to respond to the decrease in system frequency, derives a value by subtracting an amount corresponding to a latent power generation output with which the power generation output can be increased, from the required restricted amount, and sets a restricted amount of the power generation output in each wind power generator to perform the operation with the power generation output previously limited to respond to the decrease in system frequency, based on the above value.

Abstract: To provide a diesel hybrid vehicle system that does not need to additionally include a simulated sound generator and that is capable of achieving reduction in size, weight and cost of a vehicle. Not only during running of a vehicle, but even when a diesel engine is stopped at the time of starting up the vehicle or during braking control of the vehicle and when an output of the diesel engine is reduced during coasting of the vehicle, a propeller fan of a radiator is forcibly driven to generate a wind sound caused by the propeller fan.

Abstract: A method of operating a drive train (110) for a hybrid electric vehicle, and a drive train, is disclosed. The drive train comprises an internal combustion engine (120), a first electrical machine (130) and electrical energy storage means (150). The internal combustion engine is coupled to drive the first electrical machine as a generator and the first electrical machine connected to supply electrical energy to the electrical energy storage means. The electrical energy storage means is arranged for supplying electrical energy to at least a second electrical machine (170) for driving wheels (180) of a hybrid electric vehicle.

Abstract: Embodiments of the disclosure include an electric taxi system including a generator configured to provide an AC power source and a main controller configured to generate one or more PWM control signals. The electric taxi system also includes a plurality of motor controllers connected in parallel to the generator, wherein each of the plurality of motor controllers receives one of the one or more PWM control signals. The electric taxi system further includes a plurality of motors, wherein each of the plurality of motors are coupled to one of the plurality of motor controllers.

Abstract: Embodiments of the disclosure include an electric taxi system including a generator configured to provide an AC power source and a main controller configured to generate one or more PWM control signals. The electric taxi system also includes a plurality of motor controllers connected in parallel to the generator, wherein each of the plurality of motor controllers receives one of the one or more PWM control signals. The electric taxi system further includes a plurality of motors, wherein each of the plurality of motors are coupled to one of the plurality of motor controllers.

Abstract: An access means for providing access to components within a stationary housing arrangement of an electrical machine with a stationary part and a rotatable part includes an arrangement of permanent fixtures arranged on the stationary housing arrangement of the electrical machine. Further, an electrical machine with a stationary part and a rotatable part is provided, which electrical machine includes such an access means arranged in a stationary housing arrangement of the electrical machine. Also, a wind turbine with such an electrical machine is provided.

Abstract: A ship includes: a high-pressure injection engine using fuel gas as fuel to obtain a propulsion power of the ship; a generator engine using fuel gas as fuel to generate electricity; a motor generating a power by using the electricity generated from the generator engine; a propulsion propelling the ship; a main clutch connecting the high-pressure injection engine to the propulsion; an auxiliary clutch connecting the gear box to the propulsion; and a gear box disposed in a front side of the propulsion and power-connected to the main clutch and the auxiliary clutch. The high-pressure injection engine and the motor are selectively power-connected to the propulsion to obtain the propulsion power of the ship.

Abstract: A vehicle has a motor serving as a driving source for running the vehicle, a high-power assembled battery and a high-capacity assembled battery each capable of supplying an electric power to the motor, and a temperature adjusting mechanism adjusting the temperature of each of the high-power assembled battery and the high-capacity assembled battery. The temperature adjusting mechanism supplies a heat exchange medium for use in the temperature adjustment of the high-power assembled battery and the high-capacity assembled battery to each of the assembled batteries. The high-power assembled battery is capable of charge and discharge with a current relatively larger than that in the high-capacity assembled battery.

Abstract: A machine is described that includes an electric drive for propelling the machine along a ground surface. The machine includes an electric power supply system configured to deliver operating electrical power to the electric drive. The electric power system includes a first generator and a second generator. The electric power system also includes a first rectifier coupled to the first generator and having a first direct current (DC) output and a second rectifier coupled to the second generator and having a second DC output. Both the first DC output and the second DC output are coupled to the single DC bus, thereby providing an arrangement for the first rectifier and the second rectifier to simultaneously provide power to the single DC bus. The electrical power system also includes a first inverter/controller coupled to the single DC bus and configured to provide a controlled alternating current to a first motor.

Abstract: A generating device of vehicle installed on a car body's bottom and comprising: at least a fastening device; at least a girder joining the fastening device and oscillating vertically; at least a strut fixed at the girder far away from the fastening device; at least an alternator under the girder; at least a roller joining the strut far away from the girder, contacting ground surfaces and oscillating vertically; at least a battery electrically connected to the alternator. As such, the rollers and the girders driven by a running vehicle oscillate vertically and the girders oscillating downward transmit kinetic energy to the alternators in which kinetic energy is constantly transformed to electric energy stored in the batteries.

Abstract: A rotor for a permanent magnet electrical machine includes a ferromagnetic core structure having cavities which divide the ferromagnetic core structure into pole regions (103), a yoke region (104), and bridges (105, 106) between them. The rotor includes permanent magnets (107, 108) located in the cavities and arranged to produce magnetic fluxes penetrating the pole regions so as to form magnetic poles of the rotor. The cavities have portions which extend towards the quadrature-axis (Q) and are free from the permanent magnets. Thus, non-ferromagnetic regions for reducing leakage fluxes of the permanent magnets are being formed. Furthermore, the portions of the cavities have a shape curving towards the geometrical rotation axis of the rotor. As the portions of the cavities have the shape curving towards the rotation axis, the cavities can be made longer and the routes of the leakage.

Abstract: A vehicle includes an internal combustion engine, a first rotating electric machine starting the internal combustion engine, a power control unit for operating the first rotating electric machine, a power storage device for supplying electric power to the power control unit, and a control device controlling the power control unit such that a voltage of the power storage device does not fall below a lower limit. When a change condition including a condition that the internal combustion engine is being operated is met, the control device sets the lower limit at a value lower than while the internal combustion engine is at a stop. Preferably, the change condition further includes a condition that a magnitude of voltage change of the power storage device is less than or equal to a first threshold value in addition to the condition that the internal combustion engine is being operated.

Abstract: A rotary and linear motion device includes a magnetic stator assembly, opposed electromagnetic actuators, and a linear-to-rotary converter (e.g., cam). Each electromagnetic actuator includes a coil that is configured to reciprocate relative to the magnetic stator assembly or to linearly translate in a common direction relative to the magnetic stator assembly. The electromagnetic actuators are coupled to the linear-to-rotary converter and upon reciprocation or linear translation, drive the linear-to-rotary converter in rotary or linear motion. The device may be located inside a wheel, which may be part of a vehicle. If part of a wheel of a vehicle, the device can be used to provide propulsion, steering, braking, and suspension for the vehicle.

Abstract: An electric vehicle comprises an air tank (11, 21, 31) and an air turbine (12, 22, 32) connected to the air tank and an electrical power generator (13, 23, 33) respectively. The air tank is provided with an air charging interface and a switching valve, external compressed air is stored into the air tank through the air charging interface, and the stored compressed air is output to the air turbine under the control of the switching valve. The air turbine converts air energy of the input compressed air into kinetic energy for driving the electrical power generator to generator power. The electrical power generator is connected to the driving motor (14, 24, 34) and is used for supplying power to the driving motor when generating power. The electric vehicle has increased travel distance per charge and elongated service life of the storage battery, and is environmental friendly and energy saving.

Abstract: A novel multiple induction electric motor system that separately produces synchronized variable frequency alternating current control signals and using multiple induction electric motors, produces synchronized rotating magnetic fields responsive to the control signals, induces magnetic fields around a conductor in inductive rotors responsive to the rotating magnetic fields and applies rotational forces between the rotating magnetic fields and the induced magnetic fields to a common shaft of the multiple motors. The common shaft sums the rotational forces and transmits the rotational forces to a drive wheel Such a system can be implemented using two, three or more synchronized induction electric motors, and respective elements thereof wherein the stator and rotor laminations can be arranged, stacked and/or otherwise configured such that the multiple induction electric motors operate at lower temperatures and at higher efficiencies.