Share
Industrial Technology - Linked-in Industrial Technology - Twitter Industrial Technology - News Feed
Latest Issue
Diary and Events

Advanced Engineering 2020

NEC, Birmingham(B40 1NT)

04/11/2020 - 05/11/2020

The UK's largest annual advanced manufacturing trade show, Advanced Engineering is your opportunity to (more)

Drives & Controls Exhibition

NEC, Birmingham(B40 1NT)

25/01/2021 - 27/01/2021

The show brings together key suppliers of state-of-the-art equipment representing the multi-tasking culture (more)

PPMA Show 2020

NEC, Birmingham(B40 1NT)

28/09/2021 - 30/09/2021

PPMA Show 2020 is the UK’s largest ever event dedicated to state-of-the-art processing and packaging (more)

Slip-ring motors ousted in drive for greater efficiency

Slip-ring motors ousted in drive for greater efficiency Fox's Biscuits sees improved product quality and eliminates waste with switch to ABB standard drive.

Fox's Biscuits of Batley, West Yorkshire, is well known for its high quality biscuits, which it manufactures under the Fox's brand as well as for a number of leading UK retailers under their own names. Recently this leading UK biscuit manufacturers helped to improve the quality of its products and potentially reduced the amount of wastage that the old slip-ring motors gave. It has also improved its ability to develop new products following the installation of a standard drive on one of its dough mixers.

Initially, the company was interested in investigating the potential for saving energy on its ten Baker Perkins dough mixers, each of which is driven by an 18.5kW slip-ring motor. ABB Drives Alliance member Halcyon Drives was asked to investigate the benefits to the application and any energy savings through using an ABB induction motor driven by an ABB standard drive and comparing this against one of the slip-ring motor driven mixers.

Paul Mayman, area engineering manager for Fox's Biscuits, says: "Although the initial reason for the project was energy saving, it soon became clear that the drive gives us a lot of other advantages that were more impor-tant to us. One of the major ones is the flexibility to run at different speeds than previously. We have a lot of other ingredients in our biscuits, such as fruit. Previously, the mixers might overmix, leading to staining where the fruit becomes a mush rather than remaining whole. This helps us maintain a high quality product and avoids the situation where a whole 400kg batch of dough could be wasted."

Increased innovation potential
The ability of the drive to change the speed of the mixer also allows the company to be more innovative. "With the drive controlled mixer, we can experiment by using different speeds throughout the mix, from as low as two rpm to 50 or 60rpm, depending on the recipe."

The greater torque of the ABB motor also leads to higher reliability of the mixer. Previously, if the company was trying a dough that was harder than that used in their usual products, the old slip-ring motors would not have the torque to turn the mixing paddles and the motor would trip out. Using the new motor means that the maintenance engineers need to spend less time on them and the production department has a lot more confidence that the mixer will perform correctly as required and less production time will be lost.

Mayman continues: "The drive also gives us a lot of other facilities, such as the load analyser, which saves process data such as current and torque values that we could use to assess production issues. Although we are not using these facilities as yet, they are another example of the flexibility of the ABB drive and could become more important in the future."

Following the installation of this drive and motor on one of the mixers, Halcyon discovered that the power requirements on both mixers were significantly less than rated power, indicating that the slip-ring motors were greatly oversized.

The mixers typically run 24 hours a day, seven days a week, with a duty of around 10 minutes operating time every 30 minutes. In addition to the process quality improvements, the ABB standard drive gave a cut in energy use of 30% producing further savings on the already low running costs. As well as the drive on the existing mixer, Fox's also reports that it intends to convert the remaining nine mixers at the facility to variable speed drive control.
Download pdf

Other News from ABB Ltd (Drives)

ABB’s AXW water-cooled Large AC motors offer power density with less maintenance

Latest news about AC Drives

Additional Information
Text styles