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Minebea Co., Ltd. and Minebea Motor Manufacturing Corporation ("Minebea") will launch sales of a hybrid-type stepping motor*1 with an optical rotary encoder*2 ("HB-type stepping motor with encoder") on November 1, 2009. It will join the lineup as a standardized model and can be ordered in small quantities all the way down to just one.
HB-type stepping motors with encoders are high-performance, two-phase stepping motors that use Minebea ball bearings and come equipped with a sensor that detects the position of the rotor (optical rotary encoder). These motors can obtain information such as rotating speed, rotational direction, angle of rotation and amount of rotation as an output pulse. Ordinary stepping motors are controlled by an open loop, but equipping these motors with an optical encoder enables closed-loop control. Moreover, this enables the prevention of motor step-out*3, which occurs during high-speed rotation and under high loads, so it helps improve motor reliability.
The motors are expected to be used primarily in industrial machines, medical equipment, robots and similar fields. Minebea seeks to achieve sales of 10,000 units in the first year on the market and eventually reach an annual sales volume of more than 300,000 units for the series as a whole.
Lineup: 42 mm square type (3 different lengths, step angle of 1.8
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7220DB KOYO | 100 | 180 | 68 |
| 7020CDB KOYO | 100 | 150 | 48 |