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PBL37761 Datasheet(PDF) 8 Page - Ericsson |
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PBL37761 Datasheet(HTML) 8 Page - Ericsson |
8 / 8 page PBL 3776/1 8 Figure 10. Stepping modes. Information given in this data sheet is believed to be accurate and reliable. However no responsibility is assumed for the consequences of its use nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Ericsson Components. These products are sold only according to Ericsson Components' general conditions of sale, unless otherwise confirmed in writing. Specifications subject to change without notice. 1522-PBL 3776/1 Uen Rev. D © Ericsson Components AB 1999 Ericsson Components AB SE-164 81 Kista-Stockholm, Sweden Telephone: +46 8 757 50 00 V R1 Dis 1 Phase 1 Phase 2 Dis 2 I MA1 I MA2 100% –100% –100% 100% Full step mode Half step mode Modified half step mode V R2 140% 100% 140% 100% 140% –140% 140% –140% is made. The motor will then have taken two half steps equalling one full step in rotary movement. The cycle is repeated, but on the other phase. A total of eight states are sequenced until the initial state is reached again. Half-step mode can overcome poten- tial resonance problems. Resonances appear as a sudden loss of torque at one or more distinct stepping rates and must be avoided so as not to loose control of the motor´s shaft position. One disadvantage with the half-step mode is the reduced torque in the half step positions, in which current flows through one winding only. The torque in this position is approximately 70 % of the full step position torque. Modified half-step mode.The torque variations in half step mode will be elimi- nated if the current is increased about 1.4 times in the halfstep position. A constant torque will further reduce resonances and mechanical noise, resulting in better performance, life expectancy and reliability of the mechani- cal system. Modifying the current levels must be done by bringing the reference voltage up (or down) from its nominal value correspondingly. This can be done by using DACs or simple resistor divider networks. See SMD and application handbook for more information on implementing modified half step. Ordering Information Package Part No. Plastic DIP Tube PBL 3776/1NS |
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