Not all batteries are created equal, make sure the voltage is at an appropriate level. This provides us with a good start, but in reality, there are several other factors that affect the operational lifetime. The Typical Performance Characteristics graph shows how the current varies with the input voltage (vibration motors) or with the torque load (DC and gearmotors, at rated voltage). The current draw depends on the motor, for this, we can refer to the datasheets found on the product pages. This states how many hours the battery can supply 1 mA of current, or how many mA of current it can supply for one hour. To calculate how long a battery will last, we need two figures the battery’s capacity and how much current will be drawn by the motor.īatteries measure their capacity in milliamp hours, mAh. So to keep it simple we’ll use the circuit above. We could look at even more complicated circuits and how they interact with the motor, but this article is focusing on using batteries as a power source. Well, that may be a bit simplistic – you dramatically reduce your flexibility and options with so few components. However, there are many applications where the motor just needs to run in one direction at one speed and can be switched on / off by disconnecting the power: The simplest circuit for a DC motorĭon’t want to continually plug/unplug the battery? Try a simple switch: Other than the battery and the motor? Nothing. Note that help driving brushless motors and driving LRAs is better found in our Application Bulletins. Most of the article applies to all DC motors, including our gear motors and vibration motors, and we will point out any key differences. Here we’ll look at some of the common questions we see from battery users and highlight some of the potential pitfalls that need to be considered. Many of our customers intend to use our motors with battery power supplies, which can range from the most simple of designs to complex handheld devices where the battery powers a multitude of electronics.
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