Quote:
Originally Posted by philso
The RS-775 and RS-550 motors rely on the integral fan for cooling. The can overheat and fail if you are going to run them at low speeds (including stall condition = 0 rpm). The CIM, Mini-CIM and BAG motors rely on the thermal mass and heat dissipation through the motor casing, without air being forced over them, for cooling and will be much more durable in this kind of application.
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We had this problem in 2013. we had an elevator that was con counterbalanced which was run by a BB550 on a planetary gearbox. In order for the elevator to stay in one spot the motor had to run stalled, it got very hot very quickly.