Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1984-08-07
1986-06-17
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318135, G05B 1100
Patent
active
045958700
ABSTRACT:
A linear motor separates the functions of commutating into a first function for enabling a subset of coils in a linear stator which are within the magnetic influence of permanent magnets in the movable element and a second function for applying the drive power to the enabled subset. One pair of sensors produces sine and cosine signals to maintain a controd coils, the fiabout the phase of power which should be applied to the enabled subset. Another sensor produces a proportional signal which varies linearly between zero and one over each electrical quadrant with a short non-changing interval at maximum and minimum. The control system employs the sine, cosine and proportional signals to synthesize a pair of quasi-sinusoidal waveforms for application to alternate coils in the enabled subset of coils. The short non-changing intervals in the proportional signal are employed to ensure that polarity changeover to the enabled coils takes place at zero volts for bumpless drive. A balanced version of the linear motor is disclosed for reducing the load on the structure supporting the movable element.
REFERENCES:
patent: 3268747 (1966-08-01), Snowdon
patent: 3594622 (1971-07-01), Inagaki
patent: 3706922 (1972-12-01), Inagaki
patent: 4318038 (1982-03-01), Munehiro
patent: 4340846 (1982-07-01), Putt
patent: 4368413 (1983-01-01), Tazaki
patent: 4404671 (1983-09-01), Kuribayashi et al.
patent: 4463300 (1984-07-01), Mayne
Anorad Corporation
Dobeck B.
Morrison Thomas R.
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