# US 2014/0152220 A1 · Motor driving control apparatus and method, and motor using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152220 A1 - Document ID: US20140152220A1 - Status: Published application - Kind: A1 - Application number: 13/772,113 - Filed: 2013-02-20 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Samsung Electro-Mechanics Co., Ltd. - Applicants: Samsung Electro-Mechanics Co., Ltd. - Inventors: Joo Yul KO - Web page: https://patentgrep.com/patent/US20140152220A1 ## CPC - H02P 6/182: using back-emf in windings - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## Abstract There are provided a motor driving control apparatus and method and a motor using the same. The motor driving control apparatus includes: a back-electromotive force detecting unit detecting back-electromotive force of a motor apparatus; a gradient calculating unit calculating a gradient of a waveform of the detected back-electromotive force; and a controlling unit calculating a zero-crossing point of the back-electromotive force using the calculated gradient and controlling driving of the motor apparatus using the calculated zero-crossing point. ## Claims ### Claim 1 A motor driving control apparatus comprising: a back-electromotive force detecting unit detecting back-electromotive force of a motor apparatus; a gradient calculating unit calculating a gradient of a waveform of the detected back-electromotive force; and a controlling unit calculating a zero-crossing point of the back-electromotive force using the calculated gradient and controlling driving of the motor apparatus using the calculated zero-crossing point. ### Claim 2 (depends on 1) The motor driving control apparatus of claim 1, wherein the gradient calculating unit includes: a filter removing a driving control signal from the back-electromotive force; and an integrator integrating the filtered back-electromotive force provided from the filter for a predetermined time to calculate the gradient. ### Claim 3 (depends on 2) The motor driving control apparatus of claim 2, wherein the integrator calculates the gradient using the following Equation: Vintegral = ∫ 0 t  - ax + V   c = [ - ax 2 2 + V   cx ] 0 t  . ### Claim 4 (depends on 2) The motor driving control apparatus of claim 2, wherein the integrator does not calculate the gradient when the filtered back-electromotive force is periodically increased and decreased for the predetermined time. ### Claim 5 (depends on 1) The motor driving control apparatus of claim 1, wherein the controlling unit includes a zero-crossing determinator applying the gradient to an initial voltage level and determining a point at which a voltage level is equal to ½ of the initial voltage level as the zero-crossing point. ### Claim 6 (depends on 5) The motor driving control apparatus of claim 5, wherein the controlling unit further includes a delay adder adding a time delay generated due to filtering performed by the gradient calculating unit to the zero-crossing point. ### Claim 7 (depends on 1) The motor driving control apparatus of claim 1, further comprising a driving signal generating unit generating a driving control signal of the motor apparatus according to the controlling of the controlling unit, wherein the controlling unit controls the driving signal generating unit to perform phase commutation according to the zero-crossing point. ### Claim 8 A motor comprising: a motor apparatus performing a rotation operation according to a driving control signal; and a motor driving control apparatus providing the driving control signal to the motor apparatus to control driving of the motor apparatus, wherein the motor driving control apparatus calculates a zero-crossing point of back-electromotive force using a gradient of a waveform of the back-electromotive force detected in the motor apparatus and generates the driving control signal using the calculated zero-crossing point. ### Claim 9 (depends on 8) The motor of claim 8, wherein the motor driving control apparatus includes: a back-electromotive force detecting unit detecting the back-electromotive force of the motor apparatus; a gradient calculating unit calculating the gradient of the waveform of the detected back-electromotive force; and a controlling unit calculating the zero-crossing point of the back-electromotive force using the calculated gradient and controlling the driving of the motor apparatus using the calculated zero-crossing point. ### Claim 10 (depends on 9) The motor of claim 9, wherein the gradient calculating unit includes: a filter removing the driving control signal from the back-electromotive force; and an integrator integrating the filtered back-electromotive force provided from the filter for a predetermined time to calculate the gradient. ### Claim 11 (depends on 10) The motor of claim 10, wherein the integrator calculates the gradient using the following Equation: Vintegral = ∫ 0 t  - ax + V   c = [ - ax 2 2 + V   cx ] 0 t  . ### Claim 12 (depends on 8) The motor of claim 8, wherein the controlling unit includes a zero-crossing determinator applying the gradient to an initial voltage level and determining a point at which a voltage level is equal to ½ of the initial voltage level as the zero-crossing point. ### Claim 13 A motor driving control method performed by a motor driving control apparatus controlling driving of a motor apparatus, the motor driving control method comprising: detecting back-electromotive force of the motor apparatus; calculating a gradient of a waveform of the detected back-electromotive force; and calculating a zero-crossing point of the back-electromotive force using the calculated gradient and controlling the driving of the motor apparatus using the calculated zero-crossing point. ### Claim 14 (depends on 13) The motor driving control method of claim 13, wherein the calculating of the gradient includes: performing filtering for removing a driving control signal from the back-electromotive force; and integrating the filtered back-electromotive force for a predetermined time to calculate the gradient. ### Claim 15 (depends on 14) The motor driving control method of claim 14, wherein the integrating of the filtered back-electromotive force includes calculating the gradient using the following Equation: Vintegral = ∫ 0 t  - ax + V   c = [ - ax 2 2 + V   cx ] 0 t  . ### Claim 16 (depends on 14) The motor driving control method of claim 14, wherein the integrating of the filtered back-electromotive force includes allowing the gradient not to be calculated when the filtered back-electromotive force is periodically increased and decreased for the predetermined time. ### Claim 17 (depends on 13) The motor driving control method of claim 13, wherein the controlling of the driving of the motor apparatus includes applying the gradient to an initial voltage level and determining a point at which a voltage level is equal to ½ of the initial voltage level as the zero-crossing point.