Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1992-09-16
1993-12-28
Wysocki, Jonathan
Electricity: motive power systems
Switched reluctance motor commutation control
318439, H02P 700
Patent
active
052743101
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a DC motor which is used as a driving source applied to various industrial machines such as a drill machine, a polishing machine and the like in view of its high-speed rotation, and is also used as a driving source, for other applications such as those for electric vehicles in view of its small-sized construction for its large output.
BACKGROUND ART
Conventionally used as a high-speed motor is, for example, an inverter-controlled inductance motor or a semiconductor motor (a brushless motor) including a small-inductance coreless motor. However, this kind of motor is generally equipped with a DC electric power source device for rectifying an output from an AC electric power source, so that the motor tends to become bulky and costly. Especially, where an inverter is built in a motor, such a disadvantage becomes more conspicuous.
Furthermore, the above-described conventional motor normally has a maximum speed of 6,000.about.10,000 rpm, but this maximum speed has to be decreased in order to obtain a large output. However, if a voltage applied to the motor is increased in order to increase its rotational speed, the efficiency of the motor will fall, and thus its practical merit will be lost.
Besides, at present, an electric circuit for constant-torque drive or constant-speed drive or servo control of the motor, which is capable of operating stably at a high-speed driving condition, is not available. Especially, one capable of operating with a high efficiency is not available.
DISCLOSURE OF INVENTION
The purpose of the present invention is to provide a small-sized and inexpensive DC motor capable of rotating at a high speed and with high efficiency.
An another purpose of the present invention is to provide a DC motor capable of variably controlling its output torque.
In order to accomplish above-described purposes, a first aspect of the present invention provides a high-speed three-phase DC motor in a three-phase Y-connection DC motor comprising: a position detecting device, which detects a position of a magnet rotor by means of position detecting elements disposed with a mutual phase difference of a 120-degree electric angle to produce a first-phase, a second-phase and a third-phase position detecting signals having a width of a 120-degree electric angle not overlapped with each other in an elapsed time, and cyclically disposed to be successively continuous, as well as to produce a fourth-phase, a fifth-phase and a sixth-phase position detecting signals having the same constitution as the first-phase, the second-phase and the third-phase position detecting signals but being offset by a 60-degree phase difference from these position detecting signals respectively;
a first, a second and a third transistor bridge circuits, which are respectively connected to a first-phase, a second-phase and a third-phase armature coils to supply electric currents in both a forward and a backward direction; an electric circuit, which, when said first, second and third transistor bridge circuits are activated in response to said first-phase, second-phase and third-phase position detecting signals respectively, supplies an electric current of a forward direction to the armature coil connected to said activated transistor bridge circuit and, when said first, second and third transistor bridge circuits are activated in response to said fourth-phase, fifth-phase and sixth-phase position detecting signals respectively, supplies an electric current of a backward direction to the armature coil connected to said activated transistor bridge circuit; a first, a second, a third, a fourth, a fifth and a sixth back-flow preventing diodes connected in series to each of six transistors provided in said transistor bridge circuits which are connected to either a positive terminal or a negative terminal of a DC electric power source supplying electric currents to said first, second and third transistor bridge circuits; a first, a second, a third, a fourth, a fifth and a sixth capacitors connecte
REFERENCES:
patent: 3824446 (1974-07-01), Forster et al.
patent: 4494058 (1985-01-01), Berti
patent: 4503369 (1985-03-01), Nishijima et al.
patent: 4563619 (1986-01-01), Davis et al.
patent: 4633154 (1986-12-01), Maeda
patent: 4645991 (1987-02-01), Ban et al.
Kabushikigaisha Sekogiken
Wysocki Jonathan
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