A fan assembly, including motor cooling configurations and/or integrated controller configurations and associated methods are shown. Some examples of fan motors shown include electronically commutated motors that may include integrated controller circuitry. A number of cooling configurations are shown that may be used individually or in combination to provide cooling to a motor in a fan assembly.

The disclosure relates to a rotor assembly (10) having an integrated heat conducting channel for a high-speed radial ventilator, comprising a bearing tube (20) which is axially open on the inside and in which a shaft (40) that supports a ventilator wheel (30) is mounted on bearings (24, 25). Shaft comprises a rotor (50) of a canned motor, wherein the bearing tube (20) has an outwardly protruding radial projection (21), a heat dissipation portion (23) of which at least partially extends beyond the outer circumference (31) of the ventilator wheel (30), and which provides an integrated heat conducting channel that extends from the bearing (24) to the heat dissipation portion (23).

A fan module includes a blade assembly, a rotating shaft assembly and a plate member. The blade assembly has a plurality of fan blades and a bottom plate. The bottom plate is connected to the fan blades, and at least one first opening and at least one protrusion are formed on the bottom plate. The rotating shaft assembly is affixed to the bottom plate and has at least one first slot and at least one second opening. The plate member is movably disposed between the bottom plate and the rotating shaft assembly, and the plate member has at least one second slot. The second slot is sleeved on the protrusion. When the rotating shaft assembly drives the blade assembly to rotate, the plate member rotates relative to the bottom plate, thereby selectively covering the first opening or exposing the first opening.

An exhaust system for exhausting air from appliances in a commercial kitchen is described. The exhaust system comprises an exhaust fan that includes a housing, a motor mounted in the housing, and a fan directly driven by the motor. A motor compartment surrounds the motor. Cooling air is induced into and through the housing and directed into the motor compartment for cooling the motor. Cooling air is discharged from a motor compartment and mixed with exhaust air to form an air mixture that is directed through the housing of the exhaust fan.

A radial fan (1) or centrifugal blower is provided having a fan housing (2) with a spiral pressure chamber (D) and a rotor assembly (10) comprising an internally axially open bearing tube (20), in which a shaft (40) carrying a fan wheel (30) is mounted with a rotor (50) of a canned motor. An air-guiding channel (L) between a first pressure-chamber region (2a) and a second pressure-chamber region (2b) of the spiral pressure chamber (D) is formed between the bearing tube (20) and the wall (W) of the canned motor, so that an air flow flows through the air-guiding channel (L) from one pressure-chamber region (2a, 2b) to the other and in the process dissipates heat from the bearing tube (20) into the pressure chamber (D).

A blower includes a housing including an inlet and an outlet, a motor to drive a rotatable shaft, first and second impellers provided to the shaft, the first and second impellers each including a plurality of impeller blades, a first stationary component provided to the housing and including stator vanes downstream of the first impeller, and a second stationary component provided to the housing and including stator vanes downstream of the second impeller. A first set of stator vanes of the first stationary component is provided around the motor and are configured and arranged to direct airflow along the motor, to de-swirl the airflow and to decelerate air to increase pressure. A blower including a third impeller and third stationary component positioned above the first impeller is also described.

The present invention entails a rooftop exhaust system for a building. The exhaust system includes a motor that is configured to directly drive a fan. The fan during the course of operation generates a negative pressure on the upstream side of the fan. This negative pressure is utilized to induce outside cooling air into a shroud that partially encloses the motor. Cooling air passing through the shroud contacts the motor and heat associated with the motor is transferred to the cooling air after which the cooling air exits the shroud.

A rotary electric machine includes an enclosure delimiting an internal space for stator and rotor units. An access hole gives access to the internal space. An internal gasket encircles the access hole adjacent a wall of the enclosure. A closing element is disposed in the internal space, movable towards and away from the wall between a closed configuration compressing the gasket to seal the access hole and an open configuration connecting the internal space with the surrounding atmosphere. An elastic device operates to move the closing element from the open to closed configurations to compress the gasket and seal the access hole. The closing element has a pressure surface facing the access hole and accessible through the access hole via a pin. Pressing the pressure surface causes the closing element to move from the closed configuration to the open configuration.

An axial flow blower comprises a housing having a suction opening and an ejection opening formed thereon and having an air blow passage formed therein through which the suction opening and the ejection opening are in communication with each other, a motor case disposed in the air blow passage, a motor housed in the motor case, an air blow fan connected with a driven section of the motor and configured to rotate on a driving force of the motor to blow air from the suction opening toward the ejection opening and an air communication passage provided between an outside of the air blow passage and an inside of the motor case. An outflow hole is bored through the motor case and in communication with the air blow passage and an outer space outside the housing is in communication with an inner space inside the motor case through the air communication passage.

A ceiling fan and a fan set are provided. The fan set includes an upper fixed plate, a lower fixed plate, and a plurality of fan blades. The upper fixed plate has a plurality of first through holes that are in a ring-shaped arrangement, and the lower fixed plate has a plurality of second through holes that are in a ring-shaped arrangement. The quantity of the second through holes is equal to the quantity of the first through holes, and the positions of the second through holes respectively correspond to the positions of the first through hole. Each of the fan blades has an assembly portion, a blade portion, and three fasteners. The fasteners pass through the first through holes and the second through holes such that each of the fan blades is fastened between the upper fixed plate and the lower fixed plate.