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**Definition:**

A bisynchronous motor is a specialized type of synchronous motor that operates at twice the synchronous speed of the power supply’s frequency.

**Key Characteristics:**

**Synchronous Speed:**

- The synchronous speed of a motor is determined by the frequency of the electrical supply and the number of poles in the motor. For a standard synchronous motor, the synchronous speed
\( N_s \) is given by the formula:\[

N_s = \frac{120 \times f}{P}

\]

where\( f \) is the frequency of the power supply in Hz, and\( P \) is the number of poles in the motor.

**Bisynchronous Speed:**

- A bisynchronous motor runs at twice the synchronous speed. This means its operating speed is:
\[

N_{bs} = 2 \times N_s

\]

where\( N_{bs} \) is the bisynchronous speed.

**Operation:**

- Unlike a standard synchronous motor, which operates at the synchronous speed determined by the supply frequency and pole number, the bisynchronous motor operates at a higher speed. This is achieved through specific design modifications that allow it to run at this doubled speed.

**Applications:**

- Bisynchronous motors are less common and are used in specific applications where such high speeds are required. They may be employed in special machinery or equipment that needs to operate at speeds beyond the typical synchronous motor limits.

**Design Considerations:**

- The design of a bisynchronous motor involves modifications to the rotor and stator to accommodate the higher speed operation. This may include adjustments to the number of poles, winding configurations, and cooling mechanisms to handle the increased speed and associated stresses.

**Summary:**

A bisynchronous motor is a type of synchronous motor that operates at twice the synchronous speed. It is designed to achieve higher speeds compared to standard synchronous motors and is used in specialized applications requiring such performance. The motor’s design is adjusted to support the increased operational speed.

**See Related Terms:**

- Drill bit
- Hexagon bit
- Hex bit
- Screwdriver bit
- Socket bit
- Tool Bit
- Twisty bits