By Name -
wd.findElement(By.name(“Logbutton")).click();
By Class -
wd.findElement(By.className(“.logclass")).click();
Sounds like this is a wd class name and not Sencha Touch class name
By ID -
wd.findElement(By.id(“logid")).click();
Leave it to Sencha to add ID to the divs. Not a real good way to find your item
By CSS Selector -
wd.findElement(By.cssSelector(".button-log-interaction-phone")).click();
Sencha adds "x-button" to the button.
In addition you can add cld:'logclass', but I suppose that would not be the way to do it
Solution
wd is only one namespace. What you need is the Ext namespace and from there it's easy:
var btn = Ext.Viewport.down('#myButton');
btn.fireEvent('tap', btn);