PM
TDK (Epcos) offers 5 standard PM core shapes. PM cores are particularly suitable for use in transformers handling high powers in the frequency range up to 300 kHz. For numerous design tasks in telecommunications and industrial electronics (e.g. power pulse transformers in radar transmitters, antenna matching networks, machine control systems, thyristor firing transformers, energy storage chokes in switch-mode power supply equipment and others), the pot core shape offers various advantages:
- wide flux area for high power at a minimum number of turns, thus causing only low magnetic leakage and stray capacitance
- good shielding owing to the closed form
- precisely ground air gaps
- straightforward assembly and economic mounting.
A family of large pot cores, briefly designated PM cores (for Pot core Module), is presented in the following. Due to the weight of these pot cores, particularly in the case of the large cores 87/70 and 114/93, mounting on PC boards may not always be possible. In these cases, the coil former should be mounted with its terminals upwards.
PM-cores dimensions
| Standard Size |
a [mm] |
b [mm] |
c [mm] |
d1 [mm] |
d2 [mm] |
f [mm] |
g [mm] |
h |
H1 [mm] |
H2 [mm] |
|
|---|---|---|---|---|---|---|---|---|---|---|---|
| PM 50/39 | 50-1,7 | 39+1,3 | 23,4 | 20-0,6 | 5,4+0,2 | <23,0 | 1,2 | 4+1 | 26,4+0,8 | 39-0,4 |
|
| PM 62/49 | 62-2,0 | 48,8+1,5 | >29 | 25,5-0,8 | 5,4+0,2 | <28,5 | 1,2 | 4+1 | 33,4+0,8 | 49-0,4 |
|
| PM 74/59 | 74-2,5 | 57,5+1,8 | >34 | 29,5-1,0 | 5,4+0,3 | <32,4 | 2,5 | 4+1 | 40,7+0,8 | 59-0,6 |
|
| PM 87/70 | 87-3,0 | 67,1+2,1 | >40 | 31,7-1,0 | 8,5+0,3 | <36 | 3,5 | 4,5+1 | 48+0,8 | 70-0,8 |
|
| PM 114/93 | 114,0-4,5 | 88,0+3,7 | >52 | 43,0-1,4 | 5,4+0,4 | <45 | 4 | 5,3+1 | 63+1,6 |
93-1 |
|
PDF data sheets on cores and acessories are available when following a link according to appropriate core shape.
Example of an assembly set PM 74/59
Information for Ordering
These cores are supplied in sets.
Example of EPCOS ordering code structure:
N87 PM114/93 B65733A0000R087 (ungapped)
B65733 — Part number
A - AL value (AL value is given in nH only for gapped cores). Not specified for ungapped cores
R — АL (+30/-20% for letter "R") tolerance
87 — material N87