KYDS: Know Your Drive System
KYDS -Know Your Drive System – is our new program where you learn more about variable speed drive system and the most important system components (transformer, VFD, electric motor, cooling system, harmonic filter).
Scope of KYDS
The scope of the Know Your Drive System program is briefly introduced here.
Input transformer
– Purpose of input transformer in drive systems
– Multi-winding design
– Benefit of phase shifting
– Vector group / Clock number
– Requirements (harmonics, insulation)
– Performance
– Testing (FAT, SAT etc)
– Protection philosophy
Variable frequency drive
– Types of VFDs
– Most common topologies
– Working principle
– Energy savings
– Comparison VSI vs CSI
– Design and dimensioning of a VFD
– Performance characteristics
– Special applications
Motor
– Types of motors
– Inverter duty design
– Perfomance
– Torque-speed curve
– Critical speeds
– Field weakening point
– Retrofit of fix-speed motor
Cooling
– Methods of cooling
– External re-cooler
– Solutions
– Design for extreme conditions
– Performance
– Efficiency
– Availability
Filter
– Purpose of harmonic filter
– Types of filters
– Design considerations
– System aspects
– Best practice
Download our brochure for more details:
How do I know if this program is the right for me?
It is natural that you ask yourself such question.
Let’s review following list of questions:
– What is the purpose of variable frequency drive?
– How to select the most suitable variable speed drive system?
– Where is the VFD technology heading?
– Which power semiconductor suits the best?
– Switching frequency: the higher the better?
– What are the benefits of a multidrive?
– Air-cooled versus liquid-cooled VFD: What shall I choose?
– Do I need regenerative VFD or not? What are the pros and cons?
– How to calculate the potential energy savings when using VFD?
– Does the investment into VFD technology pays back?
– What are the key differences between current source inverter (CSI) and voltage source inverter (VSI)?
– Can VFD ride through a grid disturbance? What is managable?
– Air gap torque ripple: Do I need to be afraid?
– How to protect a variable speed drive system?
– Please guide me: How to achieve the best availability?
– What noise level does the drive system generate?
– What is the role of harmonics? How to mitigate them?
– What level of harmonic distortion is acceptable?
– How do converter transformers differ from power transformers?
– How does a multi-winding transformer look like?
– What does phase shifting actually mean? What winding connections can be used?
– Help! How to understand the transformer clock number / vector group?
– Shall I go for dry type or liquid immersed type of transformer?
– How shall a VFD transformer be properly tested?
– What are the challenges of variable speed motor design?
– How do inverter duty motors differ from their direct on-line counterparts?
– Where to expect the machine critical speed?
– What is a better choice: induction or synchronous machine?
– FWP: What is that and how to find an optimal design point?
– Can I retrofit an existing fix-speed motor with VFD? What needs to be checked?
– When to use a geared system and when to go gearless?
– What types of excitation of synchronous machines exist?
– Are all excitation systems compatible with VFDs?
– What is the purpose of harmonic filter? What types of filters can be used?
– When is a harmonic filter required? How to design it? Where to pay attention?
– Do you recommend a passive filter or an active filter?
– What are the most common national and international standards?
– Which one is the most stringent one?
– Which concept of re-cooling of electric room is the best for my installation?
– How to select a cooling system for extreme ambient conditions?
– What kind of redundancy on the cooling system makes sense?
Our guideline is simple:
If you are interested in just 1-3 points in above list then you may select the specific class only. However, if you would like to know the answers to several points we recommend to purchase the whole program (5 classes).
Cost of “Know Your Drive System”
KYDS consists of 5 individual classes. Each class is dedicated to one of the system components as per description above.
Entire program (set of 5 classes): CHF 100.-
One specific class only: CHF 25.-
Payment of “Know Your Drive System”
Two options are available:
a) Using PayPal: send the money to info@mb-drive-services.com
b) Transfer to our bank account:
- Bank: PostFinance
- IBAN: CH52 0900 0000 8980 8108 2
- BIC: POFICHBEXXX
- Company:
- MB Drive Services GmbH
- Baslerstrasse 3
- 5200 Brugg, AG
- Switzerland
