Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1984-09-12
1986-04-29
Miska, Vit W.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, 310 68R, H02K 2908
Patent
active
045859795
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Technical Field
So far flat and small three-phase brushless motor has been proposed as shown in FIG. 1. In FIG. 1, reference numeral 1 designates a stator, 2 a rotor and 3 a rotary shaft. This stator 1 comprises six flat stator coils L.sub.1, L.sub.2 . . . L.sub.6 which are disposed on a base plate 4 of nearly circular shape with an equal angular range, for example, an angular range of 60.degree. as shown in FIG. 2. In this case, a pair of opposing stator coils L.sub.1 and L.sub.4 ; L.sub.2 and L.sub.5 ; and L.sub.3 and L.sub.6 are respectively connected in series or in parallel to each other. The rotor 2 is formed of a magnet of disk shape in which eight poles of N poles and S poles are alternately magnetized with an equal angular range as, for example, shown in FIG. 3. Further, electromagnetic transducer elements, for example, Hall elements H.sub.1, H.sub.2 and H.sub.3 are respectively disposed on the base plate of the stator 1 at its predetermined position, for example, at the intermediate position between the stator coils L.sub.6 and L.sub.1, at the intermediate position between the stator coils L.sub.1 and L.sub.2 and at the intermediate position between the stator coils L.sub.2 and L.sub.3 on the external peripheral portion of the base plate of the stator 1. In this case, although the geometrical angle between adjacent Hall elements H.sub.1, H.sub.2 and H.sub.3 is 60.degree., since the rotor 2 includes 8 poles, the Hall elements are disposed with a relative positional relation of an electrical angle of 240.degree..
As shown in FIG. 4, each of the Hall elements H.sub.1, H.sub.2 and H.sub.3 is connected between a voltage source terminal 5 and the ground. The output signals from the Hall elements H.sub.1, H.sub.2 and H.sub.3 are respectively supplied to a control signal generating circuit 6 which is formed of a semiconductor integrated circuit. The six output terminals of the control signal generating circuit 6 are respectively connected to bases of npn-transistors 7a, 7b, 8a, 8b, 9a and 9b. The collectors of the respective transistors 7a, 8a and 9a are connected together to a voltage source terminal 10 to which a positive D.C. voltage is supplied. The emitters of the transistors 7a, 8a and 9a are respectively connected to the collectors of the transistors 7b, 8b and 9b and the emitters of these transistors 7b, 8b and 9b are respectively grounded. The connection point between the emitter of the transistor 7 a and the collector of the transistor 7b is connected through a series circuit formed of a series circuit of the stator coils L.sub.1 and L.sub.4 and a series circuit of the stator coils L.sub.5 and L.sub.2 to the connection point between the emitter of the transistor 8a and the collector of the transistor 8b. While, the connection point between the stator coils L.sub.4 and L.sub.5 is connected through a series circuit of the stator coils L.sub.6 and L.sub.3 to the connection point between the emitter of the transistor 9a and the collector of the transistor 9b. In this case, when the Hall elements H.sub.1, H.sub.2 and H.sub.3 produce at their output terminals square wave signals having phases each of which is sequentially different from one another by an electrical angle of 240.degree. as shown in FIGS. 5A, 5B and 5C, if a current flowing through the series circuit of the stator coils L.sub.1 and L.sub.4 is taken as Ia, a current flowing through the series circuit of the stator coils L.sub.2 and L.sub.5 as Ib and a current flowing through the series circuit of the stator coils L.sub.3 and L.sub.6 as Ic, the control signal generating circuit 6 is so formed that it generates control signals such that, as shown in FIGS. 5D, 5E and 5F, these currents Ia, Ib and Ic have different phases by 120.degree. each and each of them becomes a positive current during 120.degree. of the electrical angle, a zero current during the succeeding 60.degree. of the electrical angle, a negative current during the succeeding 120.degree. of the electrical angle and a zero current during the succeeding 60.degree
REFERENCES:
patent: 4025835 (1977-05-01), Wada
patent: 4039912 (1977-08-01), Wada
patent: 4217508 (1980-08-01), Uzuka
patent: 4354145 (1982-10-01), Janssen
patent: 4405885 (1983-09-01), Okamoto
Sakamoto Satoshi
Uzuka Mitsuo
Eslinger Lewis H.
Miska Vit W.
Ro Bentsu
Sinderbrand Alvin
Sony Corporation
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