Inductor type synchronous motor driving system
AssigneeMitsubushi Denki Kabushiki Kaisha
InventorMasahiko Akamatsu
Life of this patent
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Abstract
A system for driving an inductor type synchronous motor for minute control includes an inductor type synchronous motor having first means for driving m numbers of phases and a group of first magnetic teeth, second means equipped with a group of second magnetic teeth; and power feed equipment for feeding power to the driving windings of the individual phases; wherein the minute control characterized by the electrical resolution number R per electrical angle 2m (2m being one fundamental cycle) of the power feed equipment is larger than 3 m points (R.sub.2 3 m) or is stepless; and the power feed equipment feeds electric-waves of current or voltage to the driving windings, the electric-waves being trigonometric functional patterns formed by a control means of the power feed equipment.
Claims9
A fine control system for driving an inductor type synchronous motor comprising:
- an inductor type synchronous motor having a first inductor equipped with driving windings corresponding to m phases and a group of first magnetic teeth, and a second inductor equipped with a group of second magnetic teeth, m representing a positive integer;
- a DC power supply;
- a plurality of switches connected between the DC power supply and the driving windings for distributing the DC power supply voltage to the driving windings of the individual phases;
- control means for generating command pulse trains with meaning of positive and negative rotation and fine control mode command pulse trains;
- and
- distribution pattern generator means connected to the control means and responsive to the generating of a fine control mode command pulse train for controlling the on-off operation of the pulurality of switches, the distribution pattern generator means comprising:
- a carrier pulse train generator;
- gate means connected to the control means and to the carrier pulse train generator and responsive to the generating of a fine control mode command pulse train for passing a carrier pulse train;
- a first pulse train adder connected to the gate means and to the control means and responsive to the generating of a positive rotation command pulse train for summing the positive rotation command pulse rain with a carrier pulse train passed by the gate means;
- a second pulse train adder connected to the gate means and the control means and responsive to the generating of a negative rotation command pulse train for summing the negative rotation command pulse train with a carrier pulse train passed by the gate means;
- a reversible ring counter having a count-up input and count-down input and connected to the plurality of switches;
- a first frequency divider connected between the first pulse train adder and the count-up input of the counter;
- and
- a second frequency divider connected between the second pulse train adder and the count-down input of the counter;
- whereby a step number R in excess of 2m per electrical cycle can be obtained.
Dependencies are inferred from the claim text.