Feature Drives & motors
frequency inverter is standard and is selected for the higher power which increases by a factor of 2.5.
MF 120Hz motors are available from 0.55 to 22kW. In the case of the 100 frame motor that was rated at 3.0kW at 50Hz, it now delivers 7.5kW. Rated torque is still 20Nm, but the speed range has increased again from n21 = 580r/min to n2 = 3500r/min. The increased power allows selections that are often two frame sizes smaller, for example 3.0kW is now available from an 80 frame motor. This dramatically reduces the space envelope required. 120Hz technology is best for applica- tions with medium to high dynamics where the lower inertias are advanta- geous – for example, they require less energy to accelerate.
The higher speed gives further gains in efficiency well above IE2 levels. However, these motor designs fall outside the scope of international efficiency regulations which simpli- fies machine certification. Varied machinery manufacturers make different use of this drive technol- ogy. A textile machinery OEM uses it to incorporate energy-efficient motors without needing to provide extra space needed for IE2 models. Another manufacturer of rotary tables is able to use one drive where previously there
‘Selecting motors with increased speed at 87 or 120Hz is often a
win-win situation. In cases where a frequency inverter is needed to vary speed, this leads to benefits of lower purchase cost and lower running costs due to increased energy efficiency’
were two thanks to the wide speed range. For an automated warehouse the selection was based on physical size and low energy costs. For a manufac- turer of gates the high dynamics with performance approaching servo levels was the deciding factor.
Performance
Selecting motors with increased speed at 87 or 120Hz is often a win-win situation. In cases where a frequency inverter is needed to vary speed, this leads to benefits of lower purchase cost and lower running costs due to increased energy efficiency. A more dynamic performance comes together with a wider speed range and higher starting torques. Availability and technical advice, together with pre-prepared drive packages, are available from Lenze.
Lenze T: 01234 753227
www.lenze.com
Enter 238
120Hz technology can reduce the motor by two frame sizes
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