Abstract: An elevator hoist apparatus including a ventilation passage within a motor frame includes an inlet suction port at one end, a flow passage extending through the motor, and upper and lower discharge ports at the lower end of the motor frame. The upper discharge port is at a position above the horizontal plane that includes the motor axis. The upper discharge port has an axis forming an angle of 45 degrees with the horizontal plane, and the lower discharge port is at a position below the horizontal plane. A blower is connected to each discharge port, thereby generating a substantially uniform flow of cooling air within the motor frame. Therefore, the flow of cooling air generated within the motor frame is substantially uniform, eliminating stagnation regions and uneven cooling, improving the cooling efficiency.

Abstract: An elevator hoist apparatus comprising the ventilation passage within a motor frame that includes an inlet suction port at one end, a flow passage extending through the motor and upper and lower discharge ports at the other end of the motor frame. The upper discharge port is at a position above the horizontal plane including the motor axis by 45 degrees and the lower discharge port is at a position below the horizontal plane. A blower is connected to each discharge ports, thereby generating a substantially uniform flow of cooling air within the motor frame. Therefore, the flow of cooling air generated within the motor frame is substantially uniform, eliminating stagnation region and uneven cooling, improving the cooling efficiency. Also, since two blowers are disposed both above and below the horizontal plane H, the load on a single blower is small, allowing a small-sized blower to be used and the overall size of the elevator hoist apparatus can be made small.