Brushless DC linear motor

Electrical generator or motor structure – Dynamoelectric – Linear

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Details

310 68B, 318135, 318687, H02K 4102

Patent

active

050755838

ABSTRACT:
A brushless DC linear motor includes a coil unit in which electric flow terminals of each of three flat coils are connected with a star connection or with a delta connection; and the three flat coils have the same shape whose empty core section and winding section have their dimension of breadth determined on 1/2 of a magnetic pole-pitch of a magnetic body and are arranged in a shifted position of the magnetic pole-pitch by n/3 (n is a natural number excluding multiples of 3) on the coil unit. The motor also includes a sensor unit in which three magnetic detection sensors corresponding to the respective flat coils are arranged at intervals of 1/3+2m (m=0, 1, 2, 3, . . . ) of the magnetic pole-pitch and any of these magnetic detection sensors and its corresponding flat coils are arranged at the determined distance in accordance with the magnetic pole-pitch. In accordance with the signal from each of the sensors detecting the polarity of the magnet body, an electric flow switching means transfers the electric flow polarity to three terminals of a star connection or a delta connection.

REFERENCES:
patent: 4051398 (1977-09-01), Kondo
patent: 4151447 (1979-08-01), von der Heide et al.
patent: 4274020 (1981-06-01), Parsch et al.
patent: 4620253 (1986-10-01), Garwin et al.
patent: 4857781 (1989-08-01), Shih

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