Ways of encouraging companies to participate in survey for my doctoral reseach
From what you've described, you haven't done much, if anything, to provide a compelling argument for companies to participate in your research. Even though it doesn't, from your point of view, take much time or effort, it does take time and effort, both of which cost money. 

If you're talking to a company that has 300 employees. You say it takes 10 minutes. Now multiply that by the number of participants and you have 3000 minutes or 50 person-hours. Then multiply that by the labor cost, say $80/hr (you have to consider the entire cost of the employee's time; salary, benefits AND the missed opportunity cost of NOT doing what something that would make the company money) that's $4000 for your 10 minute survey. 

You need to think about what you can offer in return for their $4000 and sell it. Access to your findings? What would you offer them if you were asking for that much money to fund your research?