Steering Gear Steering Rack for Honda City V 07-13
To produce torque, most motors rely on the interaction between their stator and rotor fields. Therefore, it should come as no surprise that the amount of torque produced is a function of the alignment between these two fields. This process is often referred to asvector control. When you commutate a brushless DC motor, you're doing vector control. Even brush DC motors do vector control, but instead of being done electronically, the vector control is performed mechanically with brushes and a commutator.
But what alignment works best? It depends on what effect you're looking for. For maximum torque per amp (which is the most common desired outcome), the optimum alignment occurs when the rotor and stator fields are oriented 90º (electrically) with respect to each other. At 0º you have north poles aligned with south poles, and the motor is at equilibrium. While this is a happy condition for the motor, it unfortunately isn't producing any torque for us. At the other extreme is 180º alignment, where you have opposition between the rotor and stator magnets. Again, the motor isn't producing any torque. But in this case, the motor is not at equilibrium, and the rotor will quickly move away from this position with the slightest provocation. Between these two extremes is 90º, where the motor is working hard to get to its "happy place." Although there is not complete agreement on the terminology, maintaining 90º alignment is a special case of vector control often referred to as field oriented control (FOC).
Recall that in any EPS system, the responsibility of the electric motor is to provide torque assist. A lot of data is processed to determine when and how much torque should be applied, but the bottom line is torque. As already mentioned, this is easily accomplished on brush DC motors by controlling the amplitude of the current into the armature. Regulating this current involves four straightforward steps:
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