Novel motor solution for vacuum pumps
A
Lafert Electric Motors product story
Edited by the Engineeringtalk editorial team
Mar 1, 2004
A new single-phase motor for driving small oil-lubricated slide vane rotary vacuum pumps provides manufacturers with a technically improved and cost-efficient solution to cold-start requirements.
A new single-phase motor for driving small oil-lubricated slide vane rotary vacuum pumps provides manufacturers with a technically improved and cost-efficient solution to cold-start condition requirements.
As oil is more viscous at lower temperatures, conventional single-phase motors using centrifugal switching or relay devices must be sized for the worst-case cold-start condition.
As the pump starts the oil heats up - typically from 100 to 400C - reducing the running torque requirements on the motor.
The AEG solution optimises the switching from start to run condition by allowing for the temperature of the oil into its circuitry.
This refinement allows the motor's active material to be resized for the running condition rather than just the cold-start.
The result is a more compact motor design that brings down cost, produces a smoother current/speed curve and is quieter in operation.
Another demand from the industry has been the requirement for multiple-voltage inputs for global markets.
The new motors from AEG have a voltage selection in the range 100-120/200-240V at 50-60Hz.
Current development has been in the power range 0.37 to 0.75kW but larger models are being considered.
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