A lot of Phals (but not all) need a temperature drop to trigger them to flower again. It's not true of all orchids or even of all Phals but it seems to be what triggers a lot of mine.
Some people say it needs a drop at night, but others think it just needs a temperature drop for several days. This means that generally Phals like this will start to produce flower spikes later in the year and over the winter as temperatures naturally go down. If you have a house which is heated all winter and heated all night you might have problems getting them to flower again. I keep mine in an area which is heated in the day but allowed to cool down at night and they have so far always started to grow spikes over the winter.
As for Dendrobiums these are different. My Den Phal has not re-flowered for me yet so I'm not the best person to advise you, but I've been told that brighter sunlight is the trigger for them. They tend to flower from mature newer growths as well.
There are several broad categories of Dendrobium. Some of them are deciduous and loose their leaves in the winter, some tend to have canes which grow upright and others have canes which tend to hang down more.
Take a look at the link below where Ross talks about the six types of Den and a bit about their required conditions.
http://www.orchidboard.com/community...endrobium.html
From the look of it I believe yours is very like mine and comes into Group VI. These do not need a winter dormancy period and keep their leaves all year. They also grow more upright than some. I notice when I re-look at this link that it suggests they need water withheld twice a year, but I've not done that, so need more info from the experts myself.
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