Rotor position sensing apparatus for motors

Claim 2

A rotor position sensing apparatus for a rotor in a motor, said apparatus producing a digital position signal corresponding to a rotational position of the rotor, said apparatus comprising: position code means for supplying a position code corresponding to the rotational position of the rotor; rotation pulse means for supplying a rotation pulse whenever said rotor rotates by a predetermined amount; a counter for counting the rotation pulse to produce a value; and position indicating means for supplying the digital position signal with high order bits based on the position code and lower order bits based on the value counted by said counter.

Claim 3

A rotor position sensing apparatus according to claim 1, further comprising transition point sensing means for sensing a transition point of the position code to generate a transition signal, said counter being preset by the transition signal.

Claim 4

A rotor position sensing apparatus according to claim 1, wherein said rotation pulse generating means comprises a quadrupling pulse generating circuit for generating a quadrupled number of rotation pulses.

Claim 5

A rotor position sensing apparatus according to claim 1, further comprising a pulse encoder provided on a rotary shaft of said rotor for generating the position code and the rotation pulse.

Claim 6

A rotor position sensing apparatus according to claim 2, wherein the rotor has a rotation direction and the transition signal produced by said transition point sensing means includes preset data indicating the rotation direction of the rotor.

Claim 7

A rotor position sensing apparatus for a rotor in a motor, said apparatus producing a position signal corresponding to a rotational position of the rotor, said apparatus comprising: position code means for supplying a position code corresponding to the rotational position of the rotor; rotation pulse means for supplying a rotation pulse whenever said rotor rotates by a predetermined amount; transition point sensing means for sensing a transition point of the position code to generate a transition signal including preset data indicating the rotation direction of the rotor; a counter for counting the rotation pulse to produce a value, said counter being preset by the preset data in the transition signal; and position indicating means for indicating the rotational position of the rotor based on the position code and on the value counted by said counter, said position indicating means comprising memory means for storing a sinusoidal wave in a table having an address, said memory means utilizing the position code to determine high order bits of the address and the value counted by the counter to determine low order bits of the address.

Claim 8

A rotor position sensing apparatus for a rotor in a motor, said apparatus producing a position signal corresponding to a rotational position of the rotor, said apparatus comprising: position code means for supplying a position code corresponding to the rotational position of the rotor; rotation pulse means for supplying a rotation pulse whenever said rotor rotates by a predetermined amount; transition point sensing means for sensing a transition point of the position code to generate a transition signal including preset data indicating the rotation direction of the rotor; a counter for counting the rotation pulse to produce a value, said counter being preset by the preset data in the transition signal; and position indicating means for indicating the rotational position of the rotor based on the position code and on the value counted by said counter, said position indicating means comprising memory means for storing a sinusoidal wave in a table having an address, said memory means utilizing the position code to determine high order bits of the address and the value counted by the counter to determine low order bits of the address.

Claim 9

A rotor position sensing apparatus according to claim 6, wherein the position code is encoded using Gray code and said memory means comprises: code conversion means for converting the position code from Gray code to binary code; and a read only memory, operatively connected to said code conversion means and said counter for receiving the binary code as a high order bits address portion and the value counted by the counter as a low order bits address portion.

Claim 12

A rotor position sensing apparatus for a rotor in a motor, said apparatus producing a position signal corresponding to a rotational position of the rotor, said apparatus comprising: position code means for supplying a position code corresponding to the rotational position of the rotor; rotation pulse means for supplying a rotation pulse whenever said rotor rotates by a predetermined amount; a counter for counting the rotation pulse to produce a value; and memory means for storing sinusoidal wave data in a table having addresses, said memory means supplying one of the sinuisoidal wave data stored at a corresponding address by utilizing the position code to determine high order bits of the corresponding address and the value counted by the counter to determine low order bits of the corresponding address.

Claim 13

A rotor position sensing apparatus for a rotor in a motor, said apparatus producing a position signal corresponding to a rotational position of the rotor, said apparatus comprising: position code means for supplying a position code corresponding to the rotational position of the rotor; rotation pulse means for supplying a rotation pulse whenever said rotor rotates by a predetermined amount; a counter for counting the rotation pulse to produce a value; and memory means for storing sinusoidal wave data in a table having addresses, said memory means supplying one of the sinuisoidal wave data stored at a corresponding address by utilizing the position code to determine high order bits of the corresponding address and the value counted by the counter to determine low order bits of the corresponding address.