A single phase motor to drive of small, oil-lubricated slide vane rotary vacuum pumps that provides the manufacturer with a technically improved and cost-efficient solution to its cold-start condition requirements is available from AEG Electric Motors.
Because oil is more viscous at lower temperatures, conventional single-phase motors using centrifugal switching or relay device have been sized for the worst-case cold-start condition. As the pump starts the oil heats up, typically from 10degC to 40degC, 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 re-sized for the running condition rather than just the cold-start. The result is a more compact motor design which brings down cost, and provides a smoother current/speed curve and a quieter operation.
Another demand from the industry has been the requirement for multi-voltage inputs for global markets. The new motors from AEG have a voltage selection in the range 100-120 / 200-240V in frequencies 50-60Hz. Current development has been in the power range 0.37 - 0.75kW but larger models are being considered.
