Title:
EIGHT-POLE, TWO-PHASE BIPOLAR STEP MOTOR WITH EASE-OF-MANUFACTURE AND OPTIMIZED TORQUE SIZE
Document Type and Number:
WIPO Patent Application WO/2017/128739
Kind Code:
A1
Abstract:
An eight-pole, two-phase bipolar step motor with ease-of-manufacture and optimized torque size, the number of stator teeth therein being close to the number of rotor teeth therein to provide an improved torque. The two-phase bipolar step motor comprises an eight-pole stator with a plurality of stator teeth uniformly arranged on each pole. If D is the nominal inner diameter of the stator expressed in millimeters, then a number of stator teeth per pole equal to D ÷ 3 (rounded to the nearest integer) will provide a required winding needle space between adjacent stator poles. The step motor also has a rotor mounted for rotation within the stator and having a plurality of rotor teeth. The respective numbers of rotor and stator teeth may differ by at most two, or have a tooth ratio greater than 95%. The teeth should have a minimum tooth width and separation of at least 0.5 mm for adequate contrasting magnetic definition (polarity and/or flux amplitude) in the rotor-stator interaction.
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Inventors:
LIN TED T (US)
BADGEROW RICHARD L (US)
BADGEROW RICHARD L (US)
Application Number:
PCT/CN2016/099569
Publication Date:
August 03, 2017
Filing Date:
September 21, 2016
Export Citation:
Assignee:
SHANGHAI MOONS' ELECTRIC CO LTD (CN)
International Classes:
H02K21/14
Foreign References:
| CN2332105Y | 1999-08-04 | |||
| CN202334242U | 2012-07-11 | |||
| CN202334241U | 2012-07-11 | |||
| CN102983701A | 2013-03-20 | |||
| CN101917073A | 2010-12-15 | |||
| CN101702563A | 2010-05-05 | |||
| US20100033033A1 | 2010-02-11 |
Attorney, Agent or Firm:
SHANGHAI KESHENG INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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