Relationship Between Motor Poles and Motor Electrical Speed 8 pole motor → 4 north magnets and 4 south magnets → 4 pole pairs.2 pole motor → 1 north magnet and 1 south magnet → 1 pole pair.For this same reason, you will almost always have an even pole number (2, 4, 6, 8, etc.), as each magnet needs an opposite pole. There are an equal number of north and south magnets facing out from the rotor, and each set of N and S magnets is referred to as a ‘pole pair’.įor each pole pair in the motor there are two poles, so if the motor has 8 poles / magnets, there are 4 pole pairs. The magnets lining the rotor each have their own north and south end, with just one of those ends facing and interacting with the stator. The green stator holds the electromagnetic coils.įigure 1: Motor magnets / poles in inrunner and outrunner motors Motor Poles vs. In the diagram below, the blue rotor contains the permanent magnets in an inrunner motor (left) and an outrunner motor (right). When an electric current is delivered to the coils in the stator, the rotor starts to turn as its magnets repel the like electromagnets. These magnets are also referred to as the ‘poles’ of the motor. Within a brushless motor, there are a number of magnets lining the circumference of the rotor (figure 1). Part 1: How to Determine the Number of Poles in a Brushless Motor What are Motor Poles? After performing the calculations, we will be using the Series 1580 test stand to confirm our results. The Relationship Between Motor Poles and Kv.How to measure calculate Kv (equations).How to calculate motor poles (equations).How to Determine the Number of Poles in a Brushless Motor. In this article we cover what these metrics mean, how to calculate and measure them, and finally how they are related. Both of these parameters are useful for characterizing your motor and estimating its performance. If you are building a drone, RC vehicle, or any machine that uses a brushless DC (BLDC) motor, you have likely encountered the concepts of motor poles and motor Kv.
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