Abstract
With the ever-increasing volume of applications of various kinds of electric drives in all spheres of human activity, the issues in improving the efficiency of the electromechanical converters of electric energy, one of the most important components of the electric drive (ED), are becoming increasingly important. Such issues include reducing their weight and size, improving the functional characteristics of these devices to increase their operational life and reducing the cost of manufacture. Taking full advantage of these opportunities relates to the AC and DC single-phase commutator motor (SCM), which is widely used in regulated and high-speed motor drives in medical electric hand tools. The SCM is used in machinery where the load torque has a hyperbolic dependence on the rotational speed and the need to work with a large motor overload due to the soft mechanical characteristics of such motors.
Highlights
3 3 equation Q i2 t kn ie2x t dt and communications i2 t Ф2 dW d Q0, where i(t) and v(t) are a functions of current and speed in relative units of time, respectively; a is the amount of displacement in relative units and T is the time constant of the motor; with t – time in arbitrary units; Q – amount of heat liberated in the motor in relative units; Q0 – maximum allowable amount of heat that can be released into the armature winding during the time T, yet without leading to overheating isolation; and a constant that takes into account the heating winding
It should be noted that this control law can be derived without the use of optimal control methods, and the definition of efficiency
The efficiency – the ratio of useful power supplied – and the motor current is proportional to the square root of the electrodynamic motor torque
Summary
Single-phase commutator motor have qualities that cause their widespread use [1]: The overload capacity is greater than that in other motors used in consumer electrics; the performance of the CMS is greater than that of a DC motor with separate excitation; there is no need for a power supply for the field winding; the SCM is smaller for a given performance than DC motors of independent and parallel excitation; reliability is increased due to the large cross-section of the field winding and the small live inter-track; reversing the motor is simple to implement with a split field winding; the loss is reduced by the same amplitude of the ripple voltage as compared to a DC motor with separate excitation, with a pulsating current; they are smaller and lighter than semiconductor electric drive (ED) systems. As for electric tools, and other medical and household appliances, the workflow is at a certain optimum speed for each material. This is due to the need for optimization in terms of energy and enhanced durability.
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