Programmable electronic hand mixer

An electronic hand mixer for processing food materials, comprising:

• one or more beaters;
• a housing;
• a drive motor mounted in the housing, the drive motor adapted to apply rotational force to the beaters;
• a power control device for controlling electrical power supplied to the drive motor;
• a keypad for receiving instructions entered by users;
• a microprocessor for processing the instructions and sending signals to the power control device;
• a memory for storing the instructions, wherein:
• the power control device is responsive to a speed error signal to adjust the electronic power supplied to the drive motor resulting in an actual speed of the drive motor being within a predetermined speed range irrespective of work load of the electronic hand mixer.

An electronic hand mixer for processing food materials, comprising:

• one or more beaters;
• a housing;
• a drive motor mounted in the housing, the drive motor adapted to apply rotational force to the beaters;
• a power control device for controlling electrical power supplied to the drive motor;
• a keypad for receiving instructions entered by users;
• a microprocessor for processing the instructions and sending signals to the power control device;
• a memory for storing the instructions, wherein:
• the instructions comprise at least one user-defined mixing course, the user-defined mixing course comprises one or more mixing operations, and each of the mixing operations comprises a user-defined running speed of the drive motor associated with a user-defined running period of time of the drive motor;
• when a temperature of the drive motor rises and reaches a predetermined maximum temperature, an operation for protecting the drive motor is started;
• when a motor temperature rising speed reaches and passes a predetermined maximum value, the operation for protecting the drive motor is started;
• and when a motor speed feedback signal is equal to zero or is greatly lower than a target value, the operation for protecting the drive motor is started.